100yenadmin/hermes-plan-mode

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# Hermes Plan Mode ![Hermes Plan Mode](docs/media/banner.jpg) Plan mode for Hermes Agent: it explores read-only and writes a plan, and its edit tools stay blocked until you approve. Hermes' Codex app-server runtime and TUI `/background` and `btw` side agents are outside the block ([why](#why-it-exists)). ▶ [Watch the 85-second demo](https://x.com/ElectricSheepIO/status/2119788419924570130) [![Latest release](https://img.shields.io/github/v/release/100yenadmin/hermes-plan-mode)](https://github.com/100yenadmin/hermes-plan-mode/releases/latest) [![License: MIT](https://img.shields.io/github/license/100yenadmin/hermes-plan-mode)](LICENSE) [![Hermes >= 0.21.3](https://img.shields.io/badge/Hermes-%E2%89%A5%200.21.3-blue)](#compatibility) [![CI](https://github.com/100yenadmin/hermes-plan-mode/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/100yenadmin/hermes-plan-mode/actions/workflows/ci.yml) ```bash hermes plugins install 100yenadmin/hermes-plan-mode --enable ``` No API keys and no extra dependencies. It needs Hermes 0.21.3 or newer on the classic CLI, and 0.21.5 (v2026.9.24) or newer on the gateway, TUI and Desktop; 0.21.6 or newer is recommended ([Compatibility](#compatibility)). Restart any running Hermes session (and `hermes gateway restart` if you use the messaging gateway), then try it. [Install](#install) covers pinning a release. ## Try it 1. In a project, start a Hermes session and type `/plan add a --dry-run flag to the import command`. 2. The agent reads the code, may ask you one question with its recommended answer first, writes a plan and shows it with an approval card: "Approve, auto-accept edits", "Approve, review each file edit" (when Hermes approvals are on) or keep planning, where Other sends feedback. 3. Approve it. The agent builds the plan in the same turn, tracks the steps in a todo list and ends with a line such as `✅ Plan rev 1 done: 4 of 4 steps, 2 files changed (importer.py, test_importer.py)`. `/planmode status` shows where you are, `/planmode list` shows your plans, and `/planmode off` leaves plan mode without approving anything. ## Why it exists `/plan` in core Hermes is a prompt, which the model can ignore. Plan Mode turns it into a lock. The lock covers the tools Hermes dispatches through its `pre_tool_call` hook; Hermes' Codex app-server runtime and TUI `/background` and `btw` side agents run outside that hook, so plan mode does not block them ([Known limitations](#known-limitations)). It works on every interactive Hermes surface (CLI, TUI, Desktop and the messaging platforms) with no core changes. - **A real lock.** While it plans, Plan Mode lets through only a short read-only list of tools and blocks the rest at Hermes' `pre_tool_call` hook, including file writes and patches, the terminal, code execution, sub-agents and MCP tools. The only file it can write is its own plan, and the reply ends with a line naming any call it blocked. - **Questions before guesses.** It asks about choices only you can make, usually one question with its recommended choice first. Say "grill me", or set Questions to `thorough`, and it interviews you, one decision at a time, before every plan. - **One approval for the whole plan.** A card offers: approve and auto-accept edits, approve and review each file edit (each `write_file` and `patch`; shell commands keep Hermes' own approvals), or keep planning (Other sends feedback). Approval belongs to the exact plan you saw: if the plan changes, it asks again. The classic profile and surfaces without a card use Hermes' own approval prompt. - **It builds in the same turn** and tracks progress in a todo list. With Allow commits off (the default), terminal `git commit` and `git push` stay blocked while the plan runs, unless you ask for a commit. When the plan is done, the reply says so in one line. - **Wherever you use Hermes:** the same card on the CLI, TUI and Desktop, and as buttons on Telegram, Slack and Discord. **Contents:** [How it works](#how-it-works) · [What you see on each channel](#what-you-see-on-each-channel) · [Install](#install) · [Commands](#commands) · [The agent tool](#the-agent-tool) · [What is allowed in plan mode](#what-is-allowed-in-plan-mode) · [Configuration](#configuration) · [Compared with other plan modes](#compared-with-other-plan-modes) · [Security model](#security-model) · [Known limitations](#known-limitations) · [Compatibility](#compatibility) · [How to test](#how-to-test) · [Disclosure](#disclosure) · [Troubleshooting and reporting a bug](#troubleshooting-and-reporting-a-bug) ## How it works 1. Start planning with `/plan <task>` or `/planmode on [task]`. The agent can also enter on its own with the `plan_mode` tool. 2. The agent explores with read-only tools. For a choice only you can make, it asks with `clarify` before it writes the plan. With the default `lean` profile it prefers one question and asks at most three, each with 2–3 choices, recommended first. Say "grill me" in your request for more, or set Questions to `thorough` for an interview before every plan: one decision per question, until no open choice is left. 3. It writes the plan as Markdown under `<cwd>/.hermes/plans`. 4. It shows the complete plan in its reply, then calls `plan_mode(action="submit")`. 5. With the default `lean` profile, plan mode asks one `clarify` card for plan revision N: "Approve, auto-accept edits" (recommended), "Approve, review each file edit" (only when Hermes approvals are on) or "Keep planning". `/planmode show` prints the plan (up to 64 KB, then a truncation notice). The classic profile, a custom `levers` list without `approval_card`, and ACP, API server, cron and webhooks keep Hermes' own approval prompt: buttons, a card, the CLI panel or `/approve`. If a turn ends while the plan still awaits approval and no card was answered, the reply ends with a line saying how to approve (unless `footer` is off). 6. Approve: plan mode turns off and the agent implements the plan in the same turn. It mirrors the steps into `todo_list` (with the default `lean` profile, for plans of 4 or more steps). With "review each file edit", every `write_file` / `patch` gets Hermes' approval prompt first. When the last todo is marked done, the plan ends at the end of that turn, so fixes made in that turn after a failed final test still get the review and the no-commit block. That reply ends with one line, for example `✅ Plan rev 2 done: 5 of 5 steps, 3 files changed (cli.py, test_cli.py, README.md)` (chat platforms give counts only; API server, webhook and cron replies stay unchanged; `footer: off` turns it off). With the default lean profile, a short plan without todos gets the line when it changed files. Typed `/planmode approve` also works while the card is open and selects auto-accept edits. 7. Keep planning, or Other with feedback: plan mode stays on. The agent asks what to change (when no feedback came with it), revises the plan and submits a complete new revision. Its card says what changed since the last one ("Changed since rev 1: +6/−5 lines in Summary, Key changes, Test plan"). ```text /plan <task> ─┐ /planmode on ─┼─► PLANNING ── read-only tools, clarify, write the plan file agent: on ─┘ │ │ agent shows the plan, calls plan_mode(submit) ▼ approval card (rev N): approve / review each edit / keep planning │ │ approve │ │ keep planning, Other ─► revise ─► submit rev N+1 ▼ │ timeout ─► /planmode approve (typed) EXECUTING in the same turn ▼ todo_list progress still PLANNING │ all todos done, /planmode done or off ─► OFF ``` A real run on the Hermes CLI with the default lean profile (`/planmode on Add a subtract(a, b) function to calc.py with a test, and make divide raise ValueError on zero.`), after one clarifying question: ![The approval card for plan rev 1 under the end of the plan: approve and auto-accept edits, approve and review each file edit, keep planning, or Other](docs/media/cli-card.png) With **Approve, review each file edit**, each file write shows its path and a preview before it applies: ![A plan-mode edit review prompt for a patch to calc.py with Allow once, Allow for this session, Add to permanent allowlist and Deny](docs/media/cli-edit-review.png) The implementation then runs in the same turn (excerpt): ![The two approved patches applied and the final summary with both test commands passing](docs/media/cli-card-implement.png) To change the plan yourself, choose **Keep planning**, run `/planmode edit`, save your change, then `/planmode show` and `/planmode approve`. Approving a changed file before showing it is refused: ![/planmode edit prints the plan path; approve before show is refused with a summary of the changed lines; show prints the full plan with the added section; approve then starts implementation](docs/media/cli-edit-approve.png) The classic profile (`plan_profile: classic`) approves through Hermes' own approval panel instead: ![The classic CLI approval panel for plan rev 1, under the end of the plan the agent just showed](docs/media/cli-approval.png) ## What you see on each channel The plugin uses the approval and `clarify` UIs each Hermes surface already has; it only sizes the approval text per platform. Since 0.6.0 the lean default asks for plan approval with a `clarify` card, so the "Clarifying questions" column shows how it renders. The "Approval prompt" column applies to the per-edit review prompts, the classic profile, and surfaces without a card. | Surface | Approval prompt | Clarifying questions | Mode footer | |---|---|---|---| | CLI | approval panel with a one-line summary; the full plan is printed just above it | interactive picker | no | | TUI / Desktop | approval card with a one-line summary; the full plan is the reply just above it | the app's question prompt | no | | Telegram, Slack, Discord | native buttons, short summary (title + up to 6 step titles) | native buttons | yes | | Feishu, Teams | native buttons, full plan text | numbered list | yes | | Matrix | reactions to approve or deny, full plan text | numbered list | yes | | WhatsApp Cloud | native buttons, plan text up to about 1000 chars (the card's limit) | native buttons | yes | | Mattermost, Google Chat, Signal and other platforms | `/approve` or `/deny <reason>` text, full plan text | buttons where the platform has them, else a numbered list | yes | - On Telegram, Slack and Discord the approval card has a small text budget (Discord 300 chars, Telegram and Slack 500), so the prompt carries a ≤250-char summary. The full plan is the agent's reply sent just before it. - Mattermost and several other platforms (for example Signal, WhatsApp Cloud and SMS) do not send the agent's in-progress text before the approval prompt by default. On those, and everywhere without a budget, the approval text carries the full plan, capped at about 3500 chars (about 1000 on WhatsApp Cloud) with a pointer to the file. - `/planmode show` prints one complete plan up to 64 KiB; larger files show a prefix and do not arm edited-plan approval. - **Exercised vs supported.** We have run plan mode end to end on the CLI, TUI, Desktop, `hermes serve` and Telegram. On Telegram the approval card's buttons were clicked (0.6.7, two runs): Hermes shows each option's text in the message and the buttons as `1`, `2`, `3` and `✏️ Other`. The other platforms in the table are supported through Hermes' own approval and question UIs, but we have not exercised them. ## Install ```bash hermes plugins install 100yenadmin/hermes-plan-mode --enable hermes gateway restart # only if you run the messaging gateway ``` This installs the repository's main branch. To pin a release, add `--ref` with that release's exact 40-character commit SHA (see its release notes); `--ref` does not take a tag. Use the `100yenadmin/hermes-plan-mode` form: on a fresh Hermes 0.23.0, installing by catalog name (`plan-mode`) gives version 1.0.0 until [NousResearch/hermes-agent#151856](https://github.com/NousResearch/hermes-agent/issues/151856) is fixed. Without `--enable`, run `hermes plugins enable plan-mode`. Restart running CLI, TUI and Desktop sessions so they load the plugin. ## Commands | Command | What it does | |---|---| | `/plan <task>` | Core Hermes plan prompt. With this plugin it also turns on enforced plan mode for the session (CLI, gateway, TUI and Desktop all send core's prompt). | | `/planmode on [task]` | Fixes an absolute plans directory for this session and turns enforcement on. | | `/planmode status` | Mode, phase (`planning`, `awaiting approval (rev N)`, `executing (rev N: <path>)`, `off`), the plans directory, plan files and the last submission. | | `/planmode list` | The newest 20 plans in the plans directory, each with its status: being planned, waiting for approval, building (with steps done), approved, done, or draft. Does not create the directory. | | `/planmode show [file]` | Displays the submitted plan (else the newest), or a named tracked file, up to 64 KiB. Complete local display records the exact reviewed text for edited-plan approval. | | `/planmode edit [file]` | Gives the absolute tracked plan path and instructions to edit, save, show and approve it. Does not launch an editor. | | `/planmode approve [file]` | Approves an unchanged submitted revision, or a changed/named new file after a matching complete local `show`. A reviewed replacement becomes rev N+1 once. | | `/planmode reject [feedback]` | Keeps plan mode on and gives the feedback to the agent on its next turn. | | `/planmode done` | Ends the executing phase (stops the progress pointer and footer). No approval effect. | | `/planmode off` | Turns plan mode off without approving anything. | Plan files use `<cwd>/.hermes/plans/YYYY-MM-DD_HHMMSS-<slug>.md`; the planning note hands the model the current timestamp. Writes must use absolute paths under that directory; relative paths are rejected. Typed `/planmode approve` keeps the submitted target; if a newer tracked file was never submitted, name it explicitly after reviewing it. Explicit approval of an unsubmitted file also needs its own `show`. On the messaging gateway, plugin commands run only between turns. After a typed approval the plugin asks Hermes to start the work at once: - CLI: works. - Gateway and TUI/Desktop on Hermes 0.21.6 or newer: only with `allow_gateway_injection: true` (see Configuration). - TUI/Desktop on 0.21.5 (`v2026.9.24`): not available. When you type it while the approval prompt is still open, approving that prompt continues the waiting turn with the implementation. Denying the prompt or letting it time out does not cancel your typed approval: the work then starts in the next turn (queued where injection is available, otherwise with your next message). `/planmode done` before then cancels it. Otherwise the reply says "Send any message to start", and your next message starts implementation. ### Editing a plan before approving On classic CLI, TUI and Desktop, finish or dismiss any open approval first, then run `/planmode edit [file]`. Edit the host file in your editor and wait for the save. On Desktop, open the plan file from the project tree (`.hermes/plans/`), or from the markdown link in the agent's reply when it wrote the file itself, and use the preview's Edit and Save controls. Run `/planmode show [file]`, read the complete text, then `/planmode approve [file]`. A file changed since submission becomes the approved rev N+1; another save between show and approve requires showing it again. Implementation receives the captured text and a saved snapshot under `<plans_dir>/approved/<stem>-rev<N>-<digest>.md` (a newly created file; a taken name gets a short random tag), so later edits to the working file do not gain approval. Files above 64 KiB do not arm approval. Chat platforms also do not arm edited-file approval because complete delivery is unverified: use **Keep planning**, **Other**, or `/planmode reject <feedback>` for the agent to submit a new revision. Those revision notes ask the agent to read and preserve any changes already saved to the file. This is external-file editing with exact approval on local surfaces; it does not provide an editor inside the approval dialog. **Telegram command menu.** Telegram's bot menu holds 60 entries by default (core commands first, then plugin commands, then skills), so `/planmode` may be hidden on busy profiles. Typing it still works and `/commands` lists everything. To pin it: ```yaml platforms: telegram: extra: command_menu: priority: [planmode] ``` ## The agent tool The plugin registers one tool, `plan_mode` (toolset `plan-mode`). The profile must grant that toolset. It is on by default. It is off on a platform when that platform's `known_plugin_toolsets` lists `plan-mode` but `platform_toolsets.<platform>` does not, which happens when a tool selection was saved there without it. Add `plan-mode` to that list to turn it back on: - `on`: enters plan mode for the current session, with the same checks as `/planmode on`. - `status`: the same text as `/planmode status`. - `off`: ends plan mode only when the agent entered it itself and has not submitted a plan yet. Once a plan is submitted, or when you entered plan mode, only `/planmode approve`, `reject` or `off` ends it. - `submit` (optional `path`, `summary`): asks you to approve the plan, on the approval card or through Hermes' approval prompt (see How it works). The agent should call it on its own, not batched with other tool calls. - `inspect`: the current state as fields, so the agent can check where it stands (for example after a compaction) without parsing text: phase, plan and revision, approval status, edit policy (`auto_accept` or `review_each_edit`), todo progress, files changed by the approved plan, whether the plan finishes this turn, and the next steps allowed. Read-only. - `list`: the plans in the plans directory with their status, as `/planmode list` shows them. Read-only. The tool cannot approve or reject a plan. Approval is your act, recorded by Hermes' approval hooks or the plugin-issued `clarify` question's answer when Hermes approves automatically. On hosts with Tool Search on (the default from v2026.9.24), plugin tools sit behind `tool_search`, which plan mode allows. The plugin adds a short system-prompt hint (≤200 chars) naming `plan_mode` for multi-step or risky changes, and the planning turn note tells the model to search for `plan_mode` if it is not loaded. `/plan` and `/planmode on` stay the reliable way in. ## What is allowed in plan mode - file exploration: `read_file`, `search_files`; - web research: `web_search`, `web_extract`; - skills and history: `skills_list`, `session_search`, and `skill_view` while Hermes reports `skills.inline_shell` off (the default); - planning and user input: `todo_list`, `clarify`, `plan_mode`; - Tool Search: `tool_search` and `tool_describe` (calls made through `tool_call` are checked as the inner tool); - media and browser reads: `vision_analyze`, `video_analyze`, `browser_snapshot`, `browser_get_images`, `browser_vision`; - local UI reads: `read_terminal`, `read_window_below`; - `write_file` and `patch` only when every target is an absolute path whose real path stays inside the plans directory. Everything else is blocked: terminal, code kernels, delegation, messaging, MCP and connector tools, browser mutations, cron and kanban mutations, `memory` (it has no read-only operation), and every unknown tool. ## Configuration In Hermes Desktop, open **Settings ▸ Plugins ▸ Plan mode**. On Hermes v2026.9.24 the same form sits inline on the plan-mode row under **Capabilities ▸ Plugins**. | Setting | Default | What it does | |---|---|---| | Enforce core /plan (`enforce_builtin_plan`) | on | Core `/plan` turns on enforced plan mode for the session | | Agent hint (`agent_hint`) | on | The ≤200-char system-prompt hint naming `plan_mode`. It applies when Hermes next loads plugins: a new CLI process, or a restart of the gateway or app | | Chat footer (`footer`) | `auto` | `auto` or `off`: the one-line plan/progress footer on chat platforms. Off also turns off the approval pointer and the blocked-calls line on every surface | | Extra read-only tools (`extra_allowed_tools`) | none | Exact tool names you vouch for as read-only; plan mode lets them run | | Plan profile (`plan_profile`) | `lean` | `lean`: faster, leaner compact plans (see below). `classic`: the 0.3.5 behaviour. Lean applies with Plan style `compact` and no Plan skill | | Approval card (`approval_card`) | on | Ask for plan approval with one card in the lean profile. Off uses Hermes' approval prompt and wins over `levers` and `PLAN_MODE_LEVERS`. Change it between plans: it takes effect at once, and turning it off stops per-edit review of a running plan | | Questions (`questions`) | `normal` | `normal`: the agent asks only what reading the code cannot settle (in the lean profile it prefers one question; say "grill me" for more). `thorough`: it interviews you before every plan, one decision per question with a recommended choice, until no open choice is left, and the plan is asked to record each answer as your decision. Applies to every profile | | Plan style (`plan_style`) | `compact` | `compact`: a short, decision-complete plan (Goal, Decisions, Changes, Steps, Validation), as in Claude Code and Codex. `core`: Hermes' own `/plan` craft (zero-context tasks, full code, a commit per step) | | Allow commits (`allow_commits`) | off | Off: the agent is told not to plan or make git commits unless you ask; terminal-tool `git commit` and `git push` are blocked while an approved plan executes unless you ask. Aliases, scripts, `execute_code`, MCP git tools and other commit-creating git commands (merge, revert, cherry-pick, am) are not caught (see Known limitations). On: it may commit as the plan style suggests | | Plan skill (`plan_skill`) | none | The name of a skill whose plan format to use instead, such as your own planning contract; it wins over Plan style. When plan mode has to block `skill_view` (`skills.inline_shell` is on), Plan style is used | ### The lean profile (default since 0.4.0) Lean keeps everything that makes plan mode safe: the approval gate, the plan file, and asking before guessing. It cuts the rest. - **Planning note.** It replaces core `/plan`'s ceremony with a short note: no 2–5-minute task slicing, no copy-paste code, and no red/green TDD steps unless you ask for TDD. - **Plan format.** It is Codex-style: Summary; Key changes, grouped by behaviour and naming every touched file and every consumer of a changed interface; Test plan with exact commands; Assumptions. - **Questions.** The agent asks only about choices that reading the repo cannot settle. It prefers one question, asks at most three, and gives each 2–3 choices written as label — consequence, recommended first. If you ask to be questioned more ("grill me"), it asks one decision per question until none is left. The Questions setting (`thorough`) makes that the default. - **Fewer bookkeeping calls.** - `todo_list` is used only for plans with 4 or more steps, and status updates ride along with real work. - Later planning turns get a short reminder instead of the full note. - **Plan once (TUI, Desktop and `hermes serve`, since 0.4.1).** The agent writes the plan once, in its reply between a `<proposed_plan>` line and a `</proposed_plan>` line, and the plugin saves that text as the plan file. This needs Hermes 0.21.5 (v2026.9.24) or later with interim messages shown (and, for Codex models, commentary shown). When those conditions are not met, and always on the CLI and chat platforms, the agent writes the plan file as before. Plan once saves the reply text Hermes hands plugins after each model call. If another plugin holds the stream to withhold commentary (`transform_llm_output` with `hold_stream`), that text can include commentary it kept off screen; use `plan_profile: classic` alongside such a plugin, and leave `plan_once` (and `all`) out of any custom `levers` or `PLAN_MODE_LEVERS` list. In round 8 (2026-10-11, plugin 0.4.1, gpt-6.1-sol medium, eight tasks with three runs each per arm, `plan_once` vs the 0.4.0 default) it was 22% faster (wall time 0.78×, 95% CI 0.73–0.85) with the same test results and judge scores. - **Approval card (since 0.6.0).** After showing the complete plan, the agent submits and plan mode asks one `clarify` card: "Approve, auto-accept edits", "Approve, review each file edit" (when Hermes approvals are on) or "Keep planning"; Other sends feedback and starts a revision. Review covers `write_file` and `patch`, including file-tool calls inside `execute_code`, but not shell commands, subagents or MCP writers: once approves that edit, session / always the rest of this plan. Each approval gets a fresh key, so always leaves one inert config entry that cannot approve another plan. If approvals turn off, review pauses and edits apply without a prompt. WhatsApp Cloud has no Other with 3 choices. To opt out, turn **Approval card** off (`approval_card: false`); the other lean settings stay on. It wins over `levers` and `PLAN_MODE_LEVERS`; change it between plans, because it takes effect at once (turning it off stops per-edit review of a running plan, like turning Hermes approvals off). `plan_profile: classic` still works. - **PROOF-060** (2026-10-14, Hermes v0.21.6, gpt-6.1-sol medium; card vs the approval directive on two small tasks, 4 runs each per arm): - Approval correctness held in both arms: one approval per scripted approve, never before it, and no writes outside the plans directory before approval. - 8 of 8 verified in both arms. The approved revision addressed the feedback 4/4 with the card vs 3/4 without. - Reported, not gated (medians): wall time 122 s vs 112 s (+9%), planning 89.7 s vs 82.7 s, request to approval 25.0 s vs 22.4 s. - Not shown: other models, larger tasks, the TUI, chat-surface buttons, and "review each file edit" (the bench approves with auto-accept). - **What the prompts look like.** The per-edit prompt is Hermes' own approval prompt, so the host chooses its frame: the classic CLI shows it in the panel titled "⚠️ Dangerous Command" (once / session / always / deny), and Desktop shows "Approval needed" with Reject, Always allow… (Allow this session) and Run. The text inside is plan-mode's: the plan revision, the file and the changed lines. - **Cancelling the card.** On the classic CLI, Ctrl+C cancels the card (Esc does nothing there); on Desktop, Skip. Either way the plan stays unapproved and non-plan writes through the covered `pre_tool_call` hook stay blocked; ask the agent to show the card again when you are ready. - **Exercised by real clicks (2026-10-14, gpt-6.1-sol, Hermes v0.21.6):** classic CLI and Desktop, every choice (auto-accept, review each edit with once / deny / session, keep planning, Other feedback with the revision diff, cancel and re-ask, `/planmode show`, and the review choice hidden under `/yolo`). Not yet exercised: the TUI and chat platforms. - **Other changes.** - The approval result includes the approved plan text. - Re-entering plan mode points at your previous plan. - "Just do it" while planning means: plan it and submit. How 0.4.0 lean was measured against 0.3.5 classic: pre-registered lean-profile rounds with bars written before the runs and a blind adjudicator, on eight coding tasks with the same model (gpt-6.1-sol, medium effort) and Hermes v0.21.6. Ratios below use 0.3.5 as the denominator; these historical results do not measure current defaults. Throughout this README, **cost-weighted tokens** means `2 × uncached input + 0.1 × cached input + 10 × output`, with token counts in MTok (the campaign's $/MTok weights). This differs from unweighted token counts and wall time. - Lean finished 42% faster than 0.3.5 (wall time 0.58×, 95% CI 0.55–0.62, faster on all 8 tasks). - It used 28% fewer cost-weighted tokens (0.72×, CI 0.63–0.80). - It had equal observed test pass counts on these tasks and no approval leaks. - On two tasks where the user had an unstated preference, it asked and matched it in 10 of 10 runs, as 0.3.5 did. On the eight tasks without one it asked 15 questions against 0.3.5's 22. - Two blind judges from different model families scored plan and code quality the same as or better than 0.3.5 (round 3, three runs per task); the question counts above come from round 5, two runs per task. Set `plan_profile: classic` to get the 0.3.5 behaviour back. For a plan without a todo list, the executing reminder ends with the turn that implements it. If that turn stops early, for example on the iteration limit, say "continue": the plan is still in the conversation and on disk. #### Experimental levers Lean is a fixed set of levers: `lean_craft`, `todo_batch`, `codex_compact`, `sticky`, `reentry`, `approved_text`, `light_notes`, `question_shape`, `bridge_calls`, `blocked_tools`, `skill_policy`, `test_commands`, `choice_fidelity`, `todo_inline`, `rename_scope`, `test_plan_only`, `approval_card` and `edit_batch` (18 levers), plus `plan_once` on TUI, Desktop and `hermes serve` sessions, and `write_once` on the classic interactive CLI. `plan_skill` still opts into a skill's plan format. Seven more are measured but in no profile. To try one, or to turn `plan_once` off, set `levers` to the full list you want. It replaces the profile's set, including the automatic `plan_once` and `write_once`, so include the lean levers you want to keep: ```yaml plugins: entries: plan-mode: settings: levers: "lean_craft,todo_batch,codex_compact,sticky,reentry,approved_text,light_notes,question_shape,bridge_calls,blocked_tools,skill_policy,test_commands,choice_fidelity,todo_inline,rename_scope,test_plan_only,approval_card,edit_batch,brief_final" ``` `levers` is not in the Settings form. The `PLAN_MODE_LEVERS` environment variable sets it when the key is unset. - **`exec_skill_guard` (opt-in).** While an approved plan is executing, it blocks `skill_view` of the planning, TDD and code-review process skills, so the agent follows the approved plan instead of a per-edit test loop. A user message that mentions TDD, test-first, red-green or code review while plan mode is on or the plan is executing lifts the block for TDD and code-review skills; planning, brainstorming and executing-plans skills stay blocked. A configured `plan_skill` turns the guard off. PROOF-050 (2026-10-13, HP with vs without the guard, two PARITY-4 tasks, 4 runs each per arm) is why it stays opt-in: - The guard blocked the skill in the one lever run that asked for it, and no lever run loaded a process skill. - Results were unchanged: 8 of 8 verified in both arms. - The speed effect was not shown, because the control loaded the TDD skill in only 2 of 8 runs. - **How the 0.4.4 levers were decided.** With all five on (S44), the set cut passing tests on the refactor task (T8) below the pre-declared guard, 33.5 → 26.25 per run, and a fresh replication confirmed it (29.1 → 22.3), so 0.4.4 kept them all opt-in. The 0.4.5 stress (S45, gpt-6.1-sol, 26 runs per arm) then tested the three planning levers without the two execution levers. Every guard held, including T8 tests (24.9 vs 28.4 per run, above the 85% bar), and two levers joined lean. A labelled third arm ran the two execution levers alone: in that arm, mean passing tests per run rose on T7 (14.3 → 18.3) and T8 (28.4 → 32.3). The earlier drop was observed with all five enabled (#26). - `rename_scope` (lean since 0.4.5) tells the model to keep a rename's behaviour and assertions and to search the whole repo, naming plan files as expected matches. Rename plans that narrowed the leftover search fell from 4 of 4 to 0 in both S44 and S45, and plans adding an unrequested assertion from 3 to 0 in S45. - `test_plan_only` (lean since 0.4.5) tells the model to leave git status, git diff and other repo-hygiene checks out of the test plan unless asked. Plans with them fell from 10 of 26 to 0 in S45 (7 of 22 to 0 in S44). - `choice_record` (opt-in) tells the model to record answered clarify choices in Assumptions as the user's decision. With it, 6 of 6 plans did so in S45. Without it, the probe counted 2 of 6, but read directly 4 of 6 already attributed the choice to the user, so the deficit the lever targets was not shown and it stays opt-in. - `thorough_questions` is what Questions `thorough` turns on; it is added to any lever set, custom or not, and `all` does not include it. The interview instruction replaces `question_shape`'s bound and includes `choice_record`, and later planning turns get a one-line reminder. It has not been benchmarked. - `edit_batch` (lean since 0.6.7) tells the model to edit each file in one call where the tool allows, and to send edits to different files, including tests, in the same response. Execution rounds with edits fell from 49 to 27 on the two edit-heavy tasks in S45 (48 to 20 in S44). It joined lean after EB-2 (2026-10-14, pre-registered, decided by a blind adjudicator): 0.6.6 lean with vs without it, on T8 × 8 and on PARITY-4's N1 and L2 × 4 each per arm, same day, same harness, HP only, three tasks, gpt-6.1-sol. Results: - 16 of 16 runs verified in both arms; - T8 passing tests per run 27.5 vs 26.375 (1.04×, guard ≥ 0.85×); - execution model calls per run 7.9 vs 11.8 (0.67×, 95% CI 0.56–0.81); - execution cost-weighted tokens 0.94× (95% CI 0.75–1.18). EB-2 used medium effort; its ratios use the 0.6.6 lean arm without `edit_batch` as the denominator and the cost-weighted definition above. The first run of the same test, EB-1, was not counted for the decision. One run's call count included a Hermes background-review call, which made the call and cost bars undecided; its results and T8 bars held. #26 has both. - `brief_final` (opt-in) tells the model to finish in 2–4 lines with what changed and the test result. The median final reply fell from 128.5 to 64 output tokens in S45 (117.5 to 62.5 in S44). - Speed is labelled, not gated: S45's arm with the three planning levers (`rename_scope`, `test_plan_only`, `choice_record`) took 1.11× the baseline's wall time (95% CI 0.97–1.25). - `test_commands` (lean) tells the model to write test commands the way the repo runs them, falling back to `python3 -m pytest` for an undocumented Python repo. In the 0.4.3 stress, plans naming a bare `python` fell from 18 of 18 to 0, and so did runs that spent a round retrying the command (17 of 18 to 0). - `todo_inline` (lean) tells the model never to call `todo_list` in a response by itself: create the list with the first edit, update it alongside the next edit or test, and close it with the final test run. Rounds spent only on the todo list fell from 27 to 7. - `choice_fidelity` (lean) tells the model that a recommended clarify choice must keep every stated requirement. On the CSV task, plans that exempted NaN and Infinity from the required round trip fell from 2 of 6 to 0. - `refactor_scope` (opt-in) tells the model to keep a rename's behaviour and assertions, and to search the whole repo for leftovers. S43 first scored it as missing its bar; that was a probe error (the probe matched the plan naming its own file). Re-scored, narrowing went 4→0 of 4 and unrequested asserts 3→0 (#24). It stays opt-in because its "add no new test cases" clause may cut tests on refactors that ask for them; `rename_scope` is the rename-only form. - `bridge_calls` now also gives the agent hint and the agent-entered result the `tool_call` form, so the agent can enter and leave plan mode without a tool search (#22). - `plan_budget` asks for compact plans of under about 1,200 characters for small changes. In its pre-registered round it halved plan length and finished 24% faster, but one judge scored plan clarity lower. - `commit_override` adds "This overrides any commit step in a loaded skill" to the no-commit rule ([#18](https://github.com/100yenadmin/hermes-plan-mode/issues/18)). In round 8 neither the default nor the lever committed when the task asked for TDD (0 of 12 each), so its effect is unmeasured. - `approval_ask` tells the agent to ask the approval question even when you said not to ask questions, where Hermes approves plugin calls automatically ([#19](https://github.com/100yenadmin/hermes-plan-mode/issues/19)). In round 8 the question came unprompted in the first turn in 6 of 8 runs with it and 7 of 8 without; in the other runs it came after one nudge. - `plan_once` (in lean on TUI, Desktop and `hermes serve`): Hermes reads `display.show_commentary` when it builds the agent, so after changing that setting start a new session before relying on `plan_once`. The approval card shows the saved plan up to 3,500 characters. - `write_once` (in lean on the interactive classic CLI): the agent writes each plan revision to a new file, Hermes prints it in full as an inline diff, and the agent skips retyping it when the plugin can confirm the diff showed the whole file (see Compatibility). In SPEED-2 (pre-registered, 12 runs on two PARITY-4 tasks, #30) it cut planning output tokens to 0.65× with the same number of model calls and the same plan length, and two blind judges found no worse plans. Planning was not faster: the pre-registered planning-time gate failed (0.94×, bar 0.90×). It joins lean on the owner's metric, plan quality and tokens; wall time is reported, not gated. ### Compact plans Compact plans without commits are the default since 0.3.5. In an end-to-end comparison on eight coding tasks (same model, blind judge, one run per task), compact plans were about half as long as core's and every task still passed its checks. The judge scored plan fit plus clarity 10.0 of 10, against 8.9 for core. Median time per task fell from 194 s to 151 s, and token use was about the same. Set `plan_style: core` and `allow_commits: true` to get the 0.3.4 behaviour back. Or set them in the profile's `config.yaml` (flat keys under `settings`): ```yaml plugins: entries: plan-mode: allow_gateway_injection: false # true: typed /planmode approve starts work at once on gateway/TUI settings: enforce_builtin_plan: true agent_hint: true footer: "off" # quote it: a bare off is read as false (also honored) extra_allowed_tools: [] plan_profile: lean # or classic (0.3.5 behaviour) plan_style: compact # or core allow_commits: false plan_skill: "" # e.g. durable-plan-contract ``` - `extra_allowed_tools` is an explicit policy override: the operator vouches that those tools are read-only. - `allow_gateway_injection` is a core Hermes setting, outside `settings`, so it is not in the form. It lets this plugin queue a message into a gateway or TUI/Desktop session; the plugin uses it only to start implementation after a typed `/planmode approve`. - The nested `settings.plan_mode.<key>` layout from earlier versions is still read when the flat key is unset, but the form shows only flat keys: move old values up one level so the form and the plugin agree. ## Compared with other plan modes | | Claude Code | Codex | Hermes `/plan` | plan-mode 1.4 | |---|---|---|---|---| | Writes blocked except the plan | yes | prompt only | no | yes, for tools that pass `pre_tool_call` | | Approval prompt after the plan | dialog | "Implement this plan?" | no | a `clarify` card (lean default) or Hermes' approval prompt, every interactive surface | | Clarifying questions | AskUserQuestion | request_user_input | not prompted | `clarify`, prompted; an opt-in interview (Questions: `thorough`) | | Deny with feedback, revise | yes | yes | no | yes; Other on the card, gateway `/deny <reason>`, otherwise the agent asks | | Implement after approval | same turn | one click, as a new turn | no | same turn via the prompt; typed approve may need a message | | Progress | Tasks / TodoWrite | update_plan | `todo_list` | `todo_list`, a footer on chat platforms and a finish line | | Agent may enter | yes | no | no | yes | | Autonomy choice / clear context at approval | yes | partial | no | auto-accept or review each edit; no clear context | The plan-mode column is version 1.4 (November 2026). The Claude Code and Codex columns describe those products as documented and as run in our October 2026 benchmarks (below); either may have changed since. ### Measured against Codex plan mode Four pre-registered benchmarks, PARITY-1 to PARITY-4, compared plan-mode with Codex's own plan mode. - **Freezing and judging:** the bars were written and hashed before any run, and a blind adjudicator applied them, seeing only the bars and the measurements. - **Setup:** both products ran the same model (gpt-6.1-sol, medium) with the same scripted user. PARITY-1 to PARITY-3 used a suite of Python coding tasks, two of which hide a preference that only the user knows. PARITY-4 used four larger tasks. - **Reading the metrics:** each campaign below names its historical plugin version, not the current release. PARITY ran the lean defaults for that version. Ratios in this section use Codex plan mode as the denominator: wall time is elapsed time for the named phase; raw token use counts input and output without price weights; cost-weighted tokens use `2 × uncached input + 0.1 × cached input + 10 × output`, per MTok. PARITY-1 to PARITY-3 had 38 runs per product, with test checks on 35 and hidden-preference checks on 10. Judge percentages use blind plan pairs as the denominator, not finished-code correctness; pair counts not stated below are not given in this summary. **plan-mode 0.4.5 (PARITY-3, 2026-10-13).** Against Codex plan mode on the same model, suite and test environment, plan-mode 0.4.5 met every threshold (0 non-plan repository changes before approval in 38 runs; tests passed in 35 of 35 runs for each product; hidden preferences found in 9 of 10 runs, against 10 of 10 for Codex; judge preference 82% Claude, 82% Codex) and took 1.61× as long end to end on the core tasks of this Python suite (95% CI 1.33–1.79): 1.40× in planning and 1.65× in execution. - 0 commits before approval, and every approval went through the gate. - One of plan-mode's 9 hidden-preference hits came from a question that named no options. The scripted user's default answer happened to match, so asking quality on that task is unproven. - The judges compared plans blind, plan text only: 95% CI 71–91% for the Claude judge and 76–86% for the Codex judge. - Both products ran the same `python3` (3.9.6) and pytest (8.4.2), checked for both before and after the campaign. During the runs only Codex's command output was recorded, so for plan-mode the in-run check was not observed. - 0.4.5's two new lean levers held: 0 of 3 rename plans narrowed the leftover check or added an unrequested assertion, and 0 of 38 plans had git status or diff checks (the S44 probes). - On the rename task, the Codex judge preferred Codex's plan in 3 of 3 pairs: plan-mode's plan names plan files as expected matches of the leftover search, which that judge read as permitting old names (#28). The Claude judge preferred plan-mode's plan in 2 of 3. **Larger tasks (PARITY-4, 2026-10-13).** On four larger tasks (a static site generator, a JSON API, a Node.js CLI and a refactor across a ~200-file repo), plan-mode 0.4.5 met every threshold against Codex plan mode on the same model (plan-mode verified 12 of 12 runs, Codex plan mode 12 of 12) and took 1.82× as long end to end (95% CI 1.52–2.18×), 1.73× in planning and 1.96× in execution. - **Before approval:** 0 non-plan repository changes and 0 commits in 12 runs, and every approval went through the gate. - **Correctness:** both products finished every run, so these tasks do not separate them on correctness. - **Plan quality:** in blind plan-only comparisons, the Claude judge preferred plan-mode's plan in 92% of pairs (95% CI 75–100%) and the Codex judge in 83% (67–100%). - **The refactor** hides four code paths that use the changed events. - plan-mode's plans named all four in 3 of 3 runs. - Codex plan mode's plans named one in one run and none in the other two. - Both products' finished code handled all four. - **Raw token use:** plan-mode made more model calls (a median of 14–34 per run, against 10–13) and used 1.2–5.3× the unweighted tokens across the four tasks (12 runs per product). Its calls were not slower: the median was 7.4 s per call (297 calls), against 12.3 s per Codex request (87 requests; 49 requests with no recorded end were left out). - **Test environment:** both products ran the same `node` (v26.7.0), `python3` and pytest, and command output was recorded for both. No run showed a missing node or pytest. - **One rule changed after the smoke run and before the counted runs:** - The original node check accepted only a literal `node --test` command with its own exit status, but both products ran node through `npm test`. - The amended rule also accepts `npm test` and a passing node:test summary. It was frozen and re-checked blind before any counted run. - Under the original rule, the campaign would have stopped before it started. **Revisions (REV-1, 2026-10-15).** When the user sent the first plan back with a change, plan-mode 0.6.8 and Codex plan mode had equal observed pass counts on these tasks. Both ran on the same model (gpt-6.1-sol, medium), on the same day, with 6 runs per task and product on two tasks. Plan-mode used its lean defaults. The bars were pre-registered and applied by a blind adjudicator. - **Setup:** the scripted user denied the first plan with one change request, then approved the revision. - T6: give `slugify` a docstring with two examples and return `""` for `None`. - T7R: add `import --dry-run`, which prints `would import N rows` and writes nothing. - **Change applied in the finished code:** 12 of 12 for plan-mode, 12 of 12 for Codex plan mode. A column-blind reviewer judged the T6 docstrings. - **Original task still correct:** 12 of 12 for each. - **Cost of the revision round** (from the feedback to the next plan decision): plan-mode used 1.75× Codex's cost-weighted tokens (95% CI 1.52–2.02). - Most of the difference is output. plan-mode writes the complete revised plan and submits it in a second call: a median of 2 calls and about 1,350 output tokens per round, against 1–2 calls and about 460 tokens for Codex. - Whole runs cost 1.46–1.57× Codex's cost-weighted tokens. - Median wall time was 94 s against 51 s (T6) and 207 s against 110 s (T7R). Wall time is reported only. - **A first run of the Codex column was not a fair comparison and is not used.** It ran without the shared Python user site that PARITY-3 and PARITY-4 used, so Codex's `python3` had no pytest. - Codex then lost 4 of 6 T6 runs to a type annotation that fails on the repository's Python 3.9. It had checked that code only under Python 3.12. - That run is kept in the evidence (Codex 8 of 12). - The Codex column was then re-run with the user site, under a declaration written before the re-run. That re-run gives the numbers above. **Following the plan (EXEC-1, 2026-10-17, exploratory).** Two blind graders checked whether each finished diff did what its approved plan said, on runs already reported above: PARITY-4 (plan-mode 0.4.5) and REV-1 (plan-mode 0.6.8), 12 runs per product in each. The graders (gpt-6.1-sol and gpt-6-astra, high effort) saw only a rubric, the approved plan and the final diff, without the product's name. No pass bar was set. - **Plan steps found in the diff:** a mean of 98–100% for both products, from both graders. - **Unplanned new behaviour:** none found in either product's runs. - **Labels out of 24 runs per product, Sol grader / Astra grader:** - plan-mode: followed the plan 18 / 16, minor deviation 3 / 3, major deviation 0 / 2; - Codex plan mode: followed the plan 20 / 16, minor deviation 0 / 0, major deviation 1 / 5; - not assessable 3 / 3 for each product: one PARITY-4 task's diffs were longer than the 60 KB the graders saw. - **The graders agreed on 41 of 48 labels** (Cohen's κ 0.68). All 7 disagreements were PARITY-4 runs. - Most major deviations were one explicit plan rule handled only in part, for example a malformed-id route answering 405 where the plan said 404. - This is diff-level evidence on two task sets. It does not show runtime behaviour or the order of the work. **Asking (ASK-1, 2026-10-17).** Pre-registered against Codex plan mode on three tasks where the user holds a preference the task does not state: T5H (a cache), T9H (retries) and T9HO (retries, where the user's preference is the opposite of the option the task recommends). plan-mode 0.6.8 used its lean defaults on Hermes v0.21.6; Codex plan mode was 0.162.1. Both ran on gpt-6.1-sol, medium, with 6 runs per task per product and a scripted user answering every question. "Asks well" means that before submitting the plan, the product asked a question naming at least two concrete options for the hidden decision, received the preference, and its final code honoured it. - **The pre-registered result is undecided.** On T5H both products asked one question before planning in all 12 runs. In 11 of them (6 for plan-mode, 5 for Codex) the scripted user's matcher did not recognise the options offered, for example "keep every key" against "a bounded cache", so it never passed on the preference. What either product would have done with the preference is unknown, and the pre-registration does not allow new runs to find out. A blind adjudicator confirmed the defect and the decision. - **On the two retry tasks, which the defect did not affect,** both products asked well in 12 of 12 runs. That includes T9HO, where the preference went against the task's own recommendation. - **Base task checks** passed in 18 of 18 runs for each product. **plan-mode 0.4.2 (PARITY-2, 2026-10-12).** It met every pre-declared threshold. - 0 non-plan repository changes through the covered `pre_tool_call` hook and 0 commits before approval in 38 runs, and every approval went through the gate. - Tests passed in 35 of 35 runs, against 35 of 35 for Codex. - The hidden preference was found before the plan was submitted in 10 of 10 runs, against 10 of 10. - In blind plan-only comparisons, a Claude judge preferred plan-mode's plan in 91% of pairs (95% CI 82–100%) and a Codex judge in 88% (82–94%). - It took 1.28× as long as Codex end to end (95% CI 1.16–1.40): 1.35× in planning and 1.26× in execution. - Compared with 0.4.1, the runs that spent rounds on things that buy nothing fell: - `plan_mode` lookups: 38 of 38 → 0; - blocked command attempts: 36 of 38 → 0; - process-skill loads while planning: 30 of 38 → 1. **plan-mode 0.4.1 (PARITY-1, 2026-10-12).** It met the same thresholds: - tests 35 vs 35 of 35; - hidden preferences 9 vs 10 of 10; - judge preference 86% (Claude) and 89% (Codex). It took 1.45× as long (95% CI 1.31–1.63). Claude Code (Opus 5.5, a different model) is shown for context only: - It was fastest, with a median 27 s on the core tasks against 56 s for Codex and 80 s for plan-mode 0.4.1. - It asked no clarifying questions, so it found 0 of 6 hidden preferences. - The judges split on its plans: the Claude judge preferred Claude Code's plans in 14 of 14 pairs, and the Codex judge preferred plan-mode's in 64%. **What these runs do not show.** - **PARITY-3 recorded higher per-call latency than PARITY-2; the cause is not isolated.** plan-mode made fewer model calls than in PARITY-2 (350 vs 410), with similar median sizes (about 21k tokens in and 110 out per call), but its median wait per call was 8.8 s against 4.3 s. Codex's run times rose too, and one Codex judge call was refused with "model at capacity" and re-judged under the test plan's judge-rerun rule. Codex's per-call latency is not recorded, so how much of the 1.61× comes from the product and how much from the API that day is not measured. - **In PARITY-1 and PARITY-2 the test environments differed.** Both products ran the same `python3`, but only plan-mode's could import pytest: it saw the user's site-packages, and Codex ran with a clean home. In PARITY-2, every Codex run's `python3 -m pytest` failed while planning, 36 of 38 then ran tests through `uv run --with pytest` with an approval, and 30 of 38 Codex plans said pytest was missing. A re-analysis (2026-10-13) estimates that without that setup cost the execution ratio would be about 1.39–1.42× rather than 1.26×, so the published ratios flatter plan-mode. This is an estimate (3 runs per task, most of the shift from one task). The judges saw the "pytest missing" text in Codex's plans; there is no sign it moved their scores. PARITY-3 gave both products the same environment. - **Codex runs read-only shell commands while planning;** plan-mode blocks the terminal until approval. In PARITY-3, Codex ran shell commands and tests before approval in 38 of 38 runs, and plan-mode in 0. Both are measured as shipped. - **Not covered:** other models, chat platforms, long sessions, repos much larger than ~200 files, multi-hour tasks, most non-Python work (PARITY-4 had one Node.js task), and the time a person takes to review a plan. ## Security model - **Enforcement covers tools dispatched through `pre_tool_call`.** Tools that bypass that hook are not covered (see Known limitations). Any exception in the plugin's active `pre_tool_call` blocks the call. - **Approval is a human decision.** A submit asks Hermes to approve under a rule key unique to that plan revision (`plan-mode:<activation>:<rev>:<digest>:<nonce>`). A prompt approval counts only when Hermes' `post_approval_response` hook reports, for that exact key and tool call, the choice once, session or always, without a cancel. A plugin-issued `clarify` answer or typed `/planmode approve` is also a human path. The tool has no approve action, so the model cannot approve its own plan. - **A submitted plan belongs to you.** After a submit, the agent can no longer turn plan mode off, even if it entered plan mode itself; a denial, a timeout or a missing human decision leaves the decision with you. - **No human, no approval.** With yolo or `approvals.mode: off`, Hermes approves the call without asking and fires no hook. The plugin keeps plan mode on and asks through `clarify`: buttons on Telegram/Discord/Slack, a card on Desktop/TUI, a CLI prompt, or a numbered list elsewhere. Only the answer to that exact plugin-issued question (or typed `/planmode approve`) approves the unchanged plan. Approval comes from your clarify answer, not Hermes' approval prompt. **Approve plan rev N** starts implementation in the same turn; **Keep planning** or free text sends the plan back for revision. If `clarify` is unavailable, use `/planmode approve`. A host that ignores the approval directive uses the same fallback. - **"Always" behaves like once for plans,** because each revision has a new key. Hermes core still writes a `plugin_rule:plan-mode:…` entry to `command_allowlist` in `config.yaml` for every "Always". You can delete those entries. - **The approval prompt is Hermes' generic one.** It is worded for commands (the CLI panel is titled "Dangerous Command"; gateway cards say Hermes wants to run a command), and it times out after 300 s by default (`approvals.timeout`). A timed-out or withdrawn prompt leaves the revision awaiting approval; `/planmode approve` still works for it. - **Gateway `/approve` is not plan-specific.** Plain `/approve` resolves the oldest pending prompt, and `/approve all` approves everything pending, plans and commands alike. - **Deny reasons exist only on gateway text `/deny <reason>`.** Buttons, the CLI panel and the TUI/Desktop card deny without a reason. The agent then asks what to change. Core also tells the model "Do NOT retry" on any denial; the plugin's turn note tells it that a plan denial is review feedback. - **An edited plan needs a fresh review.** The plugin hashes the plan at submit. A card/prompt approval refuses if the file changed; typed approval of an edited or explicitly named unsubmitted file requires a complete local `/planmode show [file]` followed by a matching activation, path and fresh digest. The same captured text is approved and saved as a snapshot, independently of the `approved_text` lever. A summary or truncated display never arms it. When the card's submitted text is available, the refusal includes a bounded change summary. If the newest tracked file differs from the submitted file, bare approve names it and refuses because it was never submitted; ask the agent to submit it or review it with `/planmode show` and approve it explicitly. An unchanged submitted revision can still be approved after a denial or timeout. - **One prompt at a time.** A second submit while an approval prompt is open is blocked. A typed `/planmode approve` while the prompt is still open approves the unchanged submitted revision when it is still the newest tracked file, and the prompt's later answer changes nothing. Revised-plan approval requires finishing or dismissing that prompt first. - **`/plan` marker.** The plugin detects core's `/plan` prompt in the user's message. A user who types that text only restricts their own session; the model cannot author the user's message. If activation is refused (no session identity, profile mismatch), `/plan` stays prompt-only for that turn. If the hook times out, Hermes continues the turn without it, so enforcement may start late (when the delayed call finishes) or not at all for that turn. ## Known limitations - **The agent can skip the approval card** when you say not to ask questions ([#19](https://github.com/100yenadmin/hermes-plan-mode/issues/19)); the turn-end `/planmode approve` pointer is the fallback. - **Blocked calls are not shown by Hermes while they happen.** When plan mode stops a tool call, Hermes prints nothing for it on any surface ([NousResearch/hermes-agent#151276](https://github.com/NousResearch/hermes-agent/issues/151276)); the CLI only flashes "Preparing terminal…" in its spinner. Since 1.3.0, plan mode adds one line at the end of that turn's reply instead, for example `🔒 Plan mode blocked 1 tool call: terminal (mkdir -p …)`. On chat platforms it names only the tools, because a command can hold private text. API server, webhook and cron replies are left unchanged, `footer: off` turns the line off, and another plugin that rewrites replies can take precedence. The session record keeps every call and block message (`hermes sessions export --format md`). - **A plan-mode command sent while the agent is busy does not run on chat platforms.** If you send `/planmode off` (or any plugin command) while the agent is working or waiting on a question card, Hermes queues it and later hands it to the agent as plain text ([NousResearch/hermes-agent#131051](https://github.com/NousResearch/hermes-agent/issues/131051)). The agent cannot end plan mode for you. Answer or skip the card first, then send the command again. - **Codex app-server runtime.** Hermes' Codex app-server executes native `exec` and `applyPatch` outside `pre_tool_call`. Plan mode does not enforce them. Use a normal Hermes tool runtime when enforcement matters. - **Remote terminal backends.** Plan mode tracks plan files on the machine Hermes runs on. With a terminal backend that does not share that filesystem (for example SSH, or a container without the working directory mounted), the agent's plan write can land on the backend, where plan mode cannot find it at submit. Use a local backend, or one that mounts the working directory at the same path, for plan mode. - **TUI `/background` and `btw`** side agents run under their own task id with no public link to the parent session. They keep full tools while the parent chat is in plan mode. - **Argument-rewriting plugins.** Another plugin's `modify` directive can rewrite arguments after this plugin checked them. Avoid combining them on plan writers. - **Plan-root race.** The plugin revalidates `.hermes` and `.hermes/plans` before each plan write, but does not own Hermes' eventual file open. Do not let other processes change the plan root during plan mode. - **TUI profile scope.** If the TUI resolves the command in a different profile than the session, the plugin refuses `on`, `off`, `approve`, `reject`, `done`, `show` and `edit`. Two live sessions sharing one session key in one TUI backend cannot be told apart; keep session keys unique per profile. - **Session-key edge cases.** With `compression.in_place: false`, `/planmode on` then `/compress` before any agent turn is unsupported. On the gateway, `/planmode on` then `/new` before any agent turn keeps plan mode on in the new chat; run `/planmode off`. In a second TUI/Desktop tab of the same profile, `/planmode on` may be refused while a linked tab has plan mode on; retry from the owning tab after one turn there. - **Resuming an approved plan.** Durable resume is not supported yet, as of 1.4 (planned: [#6](https://github.com/100yenadmin/hermes-plan-mode/issues/6)). - **Hermes restart:** classic CLI execution state belongs to its process ID and is cleared on normal exit; a new CLI process does not recover its execution pointer. Other surfaces can read retained state only when their session/tab key still resolves it; there is no automatic unfinished-step recovery. - **Context compaction:** while execution state is still found, a reminder asks the agent to re-read the approved plan (its snapshot when present). Progress stores counts and a short current-item label, not a full checkpoint. Lean clears the reminder at turn end without a nonempty todo list; a surviving reminder also expires after 100 executing turns. - **TUI/Desktop key rotation or reopening:** after a key rotation (rotating compression), the tab links its new key at its next turn or tool call, so `/planmode status` and `/planmode done` find the executing plan again; a command sent before that may still miss it. The new key is not linked when it already holds another tab's plan or a state of its own; commands sent with that key then show and act on that state, not this tab's plan (`/planmode done` there would end the other tab's plan), so run `/planmode status` first. A reopened tab with a new tab id does not pick up an approved plan, and a command may be refused while another tab of the profile has plan mode on. - **Workaround:** run `/planmode status`. To clear a stale reminder, try `/planmode done` in the session/tab where status still identifies it. Open the saved file under `.hermes/plans` if `/planmode show` cannot find it, then tell the agent: "Read this approved plan: <file> (use its approved snapshot if available). Check what is already complete and continue only the unfinished work; ask me before changing the plan." If status says planning is on, have the agent submit the remaining plan and approve it again before edits. This is manual continuation, not restored progress. - **The no-commit block is best-effort.** With `allow_commits` off, terminal-tool `git commit` and `git push` are blocked while an approved plan executes unless the user asks for commits or a push. A plan left executing (classic profile, or a stale pointer) keeps blocking until the user asks or runs `/planmode done`. The check reads the command the way a shell splits it, through `&&`, `;`, pipes, `sudo`/`env`/`xargs` wrappers and `bash -c` scripts; text that only mentions git, such as `grep "git commit"`, is not blocked, but a heredoc line that starts with `git commit` is. Aliases, scripts, `execute_code`, MCP git tools and other commit-creating git commands (merge, revert, cherry-pick, am) are not caught, nor are wrappers off its list (`su -c`, `find -exec`, `setsid`), a leading redirection, `$(…)` inside double quotes or `bash -c` nested more than three deep; an internal error in the check lets the command run; delegated subagents may not share the executing state. A user message that mentions a commit can lift the block until `/planmode done`: negation is read within one clause, so "do not, under any circumstances, commit" counts as a request. Known gaps: [#79](https://github.com/100yenadmin/hermes-plan-mode/issues/79). In benchmark runs the agent committed in 3 lean runs (2 of 108 through round 7, 1 of 112 in round 8), each after loading a TDD skill that commits per step, and in 0 of 70 classic runs ([#18](https://github.com/100yenadmin/hermes-plan-mode/issues/18)). - **Plan once shows its tag lines.** On TUI, Desktop and `hermes serve` the reply shows the plan between a literal `<proposed_plan>` line and a `</proposed_plan>` line; Hermes does not style them as Codex does. Desktop's history view folds the planning reply away after the turn; the plan file stays in `.hermes/plans`. - **Approval choices cover file tools:** the lean card offers auto-accept or review each `write_file` / `patch` when Hermes approvals are on (see The lean profile). It does not offer **clear-context-and-implement** (not reachable from a plugin). - **No live mid-turn plan or progress card.** Progress shows as a footer at the end of each reply. Hermes 0.22.3 and newer let a plugin post a message and edit it in place, which a live progress message could use; plan mode does not use it yet. An interactive plan card and plan-shaped approval wording are proposed upstream in [NousResearch/hermes-agent#133306](https://github.com/NousResearch/hermes-agent/issues/133306). - **Footer limits.** Chat platforms only: never CLI, TUI, Desktop (also not for a chat session resumed in Desktop), API server, webhook, cron or delegate subagents. Only on replies of 1800 chars or fewer, because adding a footer to a longer streamed reply could re-send part of it. The approval pointer applies on every resolved surface regardless of reply length, so on a long streamed chat reply it may re-send that reply's last part. `footer: off` turns off both the footer and the pointer, and the pointer never goes to subagent or curator turns. - **Other output transforms.** Hermes runs every plugin's `transform_llm_output` but uses only the first returned text. While the footer or the approval pointer shows, another plugin's transformed reply (for example a redactor's) may be discarded; set `plan_mode.footer: off` if you rely on one (this also turns off the pointer). - **Telegram, Slack and Discord approval text** is a short summary; the full plan comes from the agent's reply or `/planmode show`. - **Duplicate submits on hosts without tool call ids.** Hermes builds that pass no `tool_call_id` to hooks cannot tell a blocked duplicate submit from the open one; every supported build passes it ([#6](https://github.com/100yenadmin/hermes-plan-mode/issues/6)). ## Compatibility - **Classic CLI:** enforced on Hermes 0.21.3 (`v2026.9.14`) and newer; the plugin requires 0.21.3. With `write_once` (lean, interactive classic CLI only), the agent writes each plan revision to a new file with `write_file`, and the CLI prints the new file as an inline diff. The agent skips retyping the plan only when the plugin can confirm that diff showed the whole file it is submitting: inline diffs on, a local file backend, at most 78 lines, no control characters and no line starting with `++ `. Otherwise it shows the plan as before. Single-query mode (`hermes chat -q`) never qualifies. Approval is unchanged. - **Messaging gateway, TUI and Desktop:** Hermes 0.21.5 (`v2026.9.24`) or newer. Earlier builds refuse `/planmode on` on these surfaces instead of pretending plan mode is active. - **0.21.6 recommended.** On 0.21.5, turning a tool-providing plugin on from Desktop, the TUI or the dashboard can replace the CLI tool set with that plugin's tools when no tool list was saved (fixed in 0.21.6). On 0.21.5, enable plan-mode with `hermes plugins enable plan-mode` or in `config.yaml` instead. - **v0.3.0 features** use only the Hermes capability they need. Where the approval directive or the approval hooks are missing, submit asks through `clarify`, with typed `/planmode approve` as the fallback if clarify is unavailable. The system-prompt hint is skipped where the host has no prompt-section API, and typed approval skips `inject_message` where the host has none. - Tested in CI against Hermes `v2026.9.14`, `v2026.9.21`, `v2026.9.24` (Python 3.11), `v0.21.6`, `v0.22.7`, `v0.23.0` and a pinned `main` (Python 3.14, the version for which 0.21.6 and newer declare their runtime dependencies). From 0.22, CI installs Hermes with `uv sync --locked`, as Hermes' own CI does. ## How to test ```bash hermes plugins validate . pytest -q ``` Manual walkthrough in a disposable workspace (full surface-by-surface list in [`docs/manual-test.md`](docs/manual-test.md)): 1. Run `/plan add a hello-world script`. Ask for `pwd` or a file write outside the plans directory; both are blocked, and the reply ends with a line naming the blocked calls. 2. Let the agent write the plan, show it and submit. The approval card appears for plan rev 1 (the classic profile uses Hermes' approval prompt). 3. Choose Keep planning, or Other with a change. Plan mode stays on; the agent revises and submits rev 2, and the card says what changed. 4. Approve. The agent implements in the same turn. With the default lean profile, a plan of 4 or more steps fills `todo_list`, and on a chat platform the reply ends with `Plan progress n/m`; a shorter plan has no todos. 5. Run `/planmode status`. A plan with todos shows phase `executing` until its turn ends after the last todo; a short plan ends with its turn. If you chose review each file edit for a short plan, status also says the review is still on until `/planmode done`. ## Disclosure Disclosure — plan-mode blocks mutating Hermes tools dispatched through `pre_tool_call` (not Codex app-server `exec`/`applyPatch`, not TUI `/background` or `btw` side agents) until the user approves a plan: on its approval card (a `clarify` question only the plugin issues and checks), through Hermes' own approval prompt (classic profile and surfaces without a card), or with `/planmode approve`. It reads nine groups of internal Hermes seams for session identity, workspace, profile, `skills.inline_shell` and the classic CLI's inline diff, each guarded, with the fallbacks listed below. It creates `<cwd>/.hermes/plans`, reads plan files there, saves the approved text of an edited plan as a new file under `.hermes/plans/approved/`, and keeps per-session state in plugin state. It adds a turn note while planning or executing, a ≤200-char system-prompt hint, and a one-line footer to short replies on chat platforms. When a turn ends while a submitted plan still awaits approval and no approval card was answered, it adds one line to that reply on any surface, whatever its length, saying how to approve (unless `footer` is off). On TUI, Desktop and `hermes serve` sessions (lean profile, `plan_once`) it reads the agent's visible reply text while planning and saves the `<proposed_plan>` block from it as the plan file. On the interactive classic CLI (lean profile, `write_once`) it checks that Hermes printed a newly written plan file in full and then tells the agent not to retype it. When the user picks "Always" on a plan approval or a per-edit review, Hermes core writes a `plugin_rule:plan-mode:…` entry to `command_allowlist` in `config.yaml`; each key belongs to one plan revision, so the entry cannot approve another plan. With `allow_gateway_injection: true` it queues one message to start work after a typed approval. It includes a report-a-problem skill: the agent drafts a bug report and files it to this repository with `gh` only after the user approves the draft. The plugin itself makes no network calls, launches no subprocesses and has no self-updater. <details> <summary>Internal Hermes seams read</summary> Each is reached through a lazy, guarded import or a guarded attribute read. 1. `gateway.session_context.get_session_env`: session identity and platform. Missing → `/planmode on` refuses and nothing blocks. 2. `gateway.session_context.session_context_engaged`: whether this process bound a server session. Missing → treated as never engaged. 3. Gateway admission: `HERMES_GATEWAY_SESSION` and `gateway.run._gateway_runner_ref` (only if already imported). 4. `agent.runtime_cwd.resolve_agent_cwd`: the turn's workspace. Missing → an absolute `TERMINAL_CWD`, or the classic CLI process cwd. 5. `hermes_cli.profiles.get_active_profile_name`: the registration profile. Missing → bound sessions refuse every state-changing command and `show`. 6. `agent.skill_preprocessing.load_skills_config`: whether `skill_view` would run inline shell. Missing or odd → `skill_view` blocked. 7. `ctx._manager.home_path`: the Hermes home the plugin registered from. Missing → bound sessions refuse every state-changing command. 8. `plan_once` only: `tui_gateway.server` (only if already imported) and its `_active_config_path`, read with `hermes_cli.config.require_readable_config_before_write`, `hermes_cli.config_effective.load_user_config_effective` and `utils.is_truthy_value`, to check that interim messages and commentary are shown; then `agent.history_commentary`, `agent.agent_runtime_helpers.strip_think_blocks` and `agent.message_sanitization.coalesce_tool_call_id` to take only the visible reply text. Any of them missing or failing → the agent writes the plan file as without `plan_once`. 9. `write_once` only: `ctx._manager._cli_ref` (the seam `ctx.dispatch_tool` uses) and its `_single_query_mode`; the CLI agent's `tool_start_callback` and `tool_complete_callback`, which must be the CLI's own `_on_tool_start` and `_on_tool_complete` (Hermes sets them only while `display.inline_diffs` is on); `TERMINAL_ENV`, which must be local; and `agent.display._MAX_INLINE_DIFF_LINES`. Any of them missing or different → the agent shows the plan as without `write_once`. Public hooks used: `pre_tool_call`, `post_tool_call`, `pre_llm_call`, `post_llm_call`, `post_api_request`, `transform_llm_output`, `transform_tool_result`, `pre_approval_request`, `post_approval_response`, `on_session_reset`, `on_session_finalize`. Public context APIs: `ctx.state`, `ctx.inject_message`, `ctx.register_system_prompt_section`, `ctx.register_skill`. </details> ## Troubleshooting and reporting a bug Run `/planmode status` in the affected session to check mode, phase and the plans directory. The agent can read the same state with `plan_mode(action="status")`. Ask your Hermes agent to "report a problem with Plan Mode". It uses the plugin's `plan-mode-report-problem` skill: it checks status, drafts the report, shows it to you and files nothing without your yes. Hermes 0.21.6 and newer list the skill for the agent; on older Hermes, ask it to load the `plan-mode:plan-mode-report-problem` skill by name. While plan mode is on, shell commands are blocked, so the agent gives you the draft and the form link instead of filing. Use the [bug report form](https://github.com/100yenadmin/hermes-plan-mode/issues/new?template=bug_report.yml) and include plugin/Hermes versions and the affected surface. For log excerpts, try `hermes logs -n 300 | grep -iE 'plan[-_]mode'`, and `hermes logs errors` for warnings. Hermes names this plugin `plan-mode` and its tool `plan_mode` in its logs; the plugin has no logger of its own, so expect only a few lines. Remove secrets, private message text and private paths before sharing diagnostics or logs. Report approval bypasses or writes outside the plans directory through a [private advisory](https://github.com/100yenadmin/hermes-plan-mode/security/advisories/new). ## License MIT ([LICENSE](LICENSE)). Maintained by [100yenadmin](https://github.com/100yenadmin). [Releases](https://github.com/100yenadmin/hermes-plan-mode/releases) · [Changelog](CHANGELOG.md) · [Contributing](CONTRIBUTING.md) · [Security policy](SECURITY.md)

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Plan Mode: report a bug or problem

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2026-10-14

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