The iii web console — chat, trace explorer, worker catalog, and the runtime host every worker injects its own pages, renderers, and configuration forms into. Read it before building or changing any console UI, and when an agent must drive the operator's…
Interactive Chromium sessions for reading and driving real web pages: open a URL, read the page as text, click and type, and read the page's own console and network history. Also scrapes: HTTP and browser fetching, screenshots, persistent sessions, crawling,…
File-backed kanban board: create, read, move and comment on tickets by key or uuid, assign agent profiles, and wake on comments through the kanban:comment trigger instead of polling. Group tickets as subtasks and file them under projects and releases. Reach…
Durable cross-session memory: named banks of always-injected markdown rules and auto-extracted memories with hybrid recall. Reach for it when the user asks you to remember, forget, or inspect what is remembered.
Durable topic queues for iii: subscribe functions to topics, publish work asynchronously, retry failed deliveries with backoff, and inspect/redrive dead-lettered messages.
See and manage the host's tmux sessions and windows from iii: which pane runs Claude Code, Codex or another agent CLI and whether it is working, waiting for the person or idle; which pane runs `iii compose` and on which ports its engine and workers listen;…
Expose registered functions as HTTP endpoints with the standalone http worker. Its surface is the `http` trigger type and, on iii 0.25 engines, the observable function `http::on-request`.
Schedule any registered function on a 6- or 7-field cron expression with the standalone cron worker. Its surface is the `cron` trigger type and, on iii 0.25 engines, the observable function `cron::on-tick`.
Shared, adapter-backed key/value store addressed by scope and key, with a reactive `state` trigger so other functions can run on every create, update, or delete without polling.
Operate GitHub through the gh CLI — typed github::* functions for pull requests, issues, repos, Actions runs/workflows, releases, and search, plus github::exec / github::api escape hatches for everything else.
Evaluate JSON state with Noul, Choice or Score questions for ticket triage, classification and graded judgments through the selected judge provider (TypeSafe JEV by default), or cancel an active request owned by the caller.
Component stories for any React project inside iii: list components and their states, build git lines (working tree, branch, commit, chat turn), compare lines into direct/indirect impact, render deterministic screenshots and DOM/React trees with arg…
Use the WhatsApp worker to manage linked-device sessions, send authorized messages, operate groups, consume events, or use an existing Meta Cloud API account.
Drive a full desktop computer over the iii bus: start a session, see the screen as an image, click, type, and scroll by coordinate, and — on native sessions — read an app's accessibility tree and act on elements by reference. Reach for it when a task needs to…
The durable agent turn loop — kick off a turn with `harness::send`, render it from session-manager transcript events, react to `harness::turn-completed`, with deny-by-default tool dispatch and synchronous hook extension points for policy siblings.
Run Unix commands and structured filesystem ops from the iii engine: exec, background jobs, and a structured fs (ls/stat/mkdir/rm/chmod/mv/grep/sed/ read/write, jailed only if fs.host_roots is configured), all forwardable into a sandbox microVM.
Discovery entry point for the engine — search the live function catalog, read the skills, system prompts, and agent profiles that installed workers ship off local disk, browse the public iii workers registry over HTTP, and install new worker bundles and kits…
DEPRECATED (will be removed in an upcoming release; migration guide https://github.com/iii-hq/iii/blob/6901a589dd39d9c34f9d5b6bd8bc82170ee21548/docs/next/upgrading/migrate-from-streams.mdx). Fire-and-forget topic pub/sub: broadcast an event with `publish` and…
Run headless Claude Code turns over the iii bus — file edits, shell, and web against any host directory — with a verbatim message feed, session resume, and full Agent SDK option pass-through. Also serves Claude Code as an interactive terminal page on the…
Run headless OpenAI Codex turns over the iii bus — sandboxed shell, file edits, and web search against any host directory — with verbatim event streaming, thread resume, and full SDK option pass-through.
Drive Devin over the iii bus. Run the local Devin CLI agent (SWE-1.6) with the iii runtime context so it discovers and operates your workers, or start and steer autonomous Devin cloud sessions through the REST API, with a passthrough to any Devin v1/v3…
Run headless xAI Grok CLI turns over the iii bus — shell, file edits, and tools against any host directory — with verbatim event feeds and session resume.
Run headless Hermes agent turns over the iii bus, deliver messages to 27+ chat platforms, and react to inbound platform/webhook events — with the agent carrying the live iii runtime context.
Run headless OpenCode turns over the iii bus — file edits, shell, and search against any host directory — with verbatim JSON event feeds, session resume, and inline token usage and cost.
Run pi coding-agent turns over the iii bus — headless with `pi::run`, or as a terminal page on the console a person types into — with a verbatim event feed, session resume, and live steering.
Generate safe interactive A2UI surfaces when a Harness response is clearer as a dashboard, form, summary, comparison, or decision interface than prose.
Acquire and observe expiring leases on operator-authorized cloudflared Quick Tunnels through iii, without choosing arbitrary origins or managing processes directly.
Create and edit diagrams as code — store mermaid text or excalidraw scenes under stable ids the console renders live, fetch the per-family mermaid syntax primer, and validate generated source before storing it.
Move and reshape big values between iii functions without routing them through the model — fp::pipe worker-side pipelines plus pure lodash-style transforms (get, pick, omit, take, drop, map, filter, split, join, uniq).
Connect this engine to another iii engine over a long-lived WebSocket so functions call across the boundary. Wire stable ids with `forward:`/`expose:`; `bridge.invoke` is the ad-hoc escape hatch.
Operate this host's Tailscale node from iii: connectivity and peers, routes and exit nodes, preferences, Taildrop file transfer, HTTPS certificates, publishing local services or the Console to the tailnet (Serve) or the internet (Funnel), accounts, tailnet…
Run the VS Code Server for a workspace directory and open the Workbench in the Console; use it when a person needs a full editor next to the chat, not when the agent itself needs to read or edit files.
OpenGantry iii worker. Use when an iii project needs deterministic promote gates: gantry::verify runs the repo gate command, gantry::middleware blocks promote-class calls until a verdict token matches the current mission.
Read Word, PowerPoint, Excel, OpenDocument, RTF, EPUB and CSV files locally with no API key — detect the format from the bytes, convert to markdown with headings, lists and tables intact, and pull out the images markdown drops.
Read PDFs locally without OCR or an API key — classify text-based versus scanned in tens of milliseconds and name the pages that still need OCR, convert to markdown with headings, lists and tables intact, and pull positioned text or the exact characters…
Drive Slack from iii — expose the Slack Web API as slack::* functions (post messages, manage channels, reactions, files, users, views, search, assistant threads), configurable from the console. Anything the Slack API can do, this worker can do.