harness-setup

name	harness-setup
description	HAR: Project init, tool setup, agent config, memory setup, skill mirror sync. Trigger: setup, init, new project, CI/Codex setup, harness-mem, mirror. Do NOT load for: implementation, review, release, planning.
description-en	HAR: Project init, tool setup, agent config, memory setup, skill mirror sync. Trigger: setup, init, new project, CI/Codex setup, harness-mem, mirror. Do NOT load for: implementation, review, release, planning.
description-ja	HAR:プロジェクト初期化・ツール設定・エージェント構成・メモリ設定・skill mirror 同期を担当。セットアップ、初期化、新規プロジェクト、CI/Codex CLI セットアップ、harness-mem、mirror で起動。実装・レビュー・リリース・プランニングには使わない。
kind	workflow
purpose	Initialize and repair Harness project configuration
trigger	setup, init, new project, CI/Codex setup, harness-mem, mirror
shape	workflow
role	generator
pair	harness-sync
owner	harness-core
since	2026-05-05
allowed-tools	["Read","Write","Edit","Grep","Glob","Bash"]
argument-hint	[init|ci|codex|harness-mem|mirrors|agents|localize]
user-invocable	true
effort	medium

Harness Setup

Integrated Harness setup skill. Consolidates the following legacy skills:

• setup — Integrated setup hub
• harness-init — Project initialization
• harness-update — Harness updates
• maintenance — File organization and cleanup

Quick Reference

Subcommand	Action
/harness-setup init	New project initialization (CLAUDE.md + Plans.md + hooks + sync + doctor)
/harness-setup ci	CI/CD pipeline configuration
/harness-setup codex	Codex CLI install and configuration
/harness-setup harness-mem	harness-mem integration and memory setup
/harness-setup mirrors	Update skills/ → public mirror bundle
/harness-setup agents	agents/ agent configuration
/harness-setup localize	Localize CLAUDE.md rules

Built-in slash discovery (CC 2.1.108+): Built-in slash commands like /init are also discovered. Use /harness-setup init only when Harness-specific bootstrap is needed.

Claude Code setup guidance (CC 2.1.120+): MCP alwaysLoad, ${CLAUDE_EFFORT}, claude plugin prune, claude project purge, ANTHROPIC_BEDROCK_SERVICE_TIER, claude_code.skill_activated.invocation_trigger, Windows PowerShell primary shell, and deferred tools for forked skills/subagents are handled with docs/claude-code-setup-mcp-telemetry-provider.md as the source of truth.

Codex plugin workflows: Do not dual-manage Codex /goal and Plans.md. Plugin-bundled hooks are opt-in; external agent imports require explicit ownership declaration; MultiAgentV2 / agents.max_threads = 8 is treated as an upper limit; sticky environments / app-server artifacts prioritize safe defaults. For Codex 0.130.0 stable: codex remote-control, large thread pagination, selected-environment view_image, live app-server config refresh, accurate turn diffs, plugin details bundled hooks, sharing discoverability controls — use docs/codex-plugin-workflows-policy.md as the source of truth.

Subcommand details

init — Project initialization

Introduces Harness to a new project.

Generated files:

project/
├── CLAUDE.md            # Project configuration
├── Plans.md             # Task management (empty template)
├── .claude/
│   ├── settings.json    # Claude Code settings
│   └── hooks.json       # Hook configuration (Go binary)
└── hooks/
    ├── pre-tool.sh      # Thin shim (→ core/src/index.ts)
    └── post-tool.sh     # Thin shim (→ core/src/index.ts)

Flow:

1. Detect project type (Node.js/Python/Go/Rust/Other)
2. Generate minimal CLAUDE.md
3. Generate Plans.md template
4. Place hooks.json
5. Go binary verification: Confirm binary is available with harness version (Node.js not required since v4.0)
6. Plugin file sync: Sync files under .claude-plugin/ to latest with harness sync
7. Health check: Pass all check items with harness doctor; present fix suggestions if issues found

Go binary verification

# Confirm binary exists and works
harness version
# Example: harness v4.0.0 (go1.22.0, darwin/arm64)

Since v4.0, the Harness core engine has migrated to a Go binary. Node.js is not required. The binary uses bin/harness (or harness on PATH).

Plugin file sync

# Sync files under .claude-plugin/ to latest
harness sync

# Check sync contents only (no changes)
harness sync --dry-run

harness sync propagates changes from the skills/ SSOT to each mirror (codex/.codex/skills/, opencode/skills/). Always run after init.

Health check

# Run all check items
harness doctor

harness doctor verifies:

Check item	Content
Binary	Does harness version return normally?
Plugin config	Is .claude-plugin/plugin.json format correct?
Hooks placement	Do hooks exist at the correct paths?
Mirror sync	Do skills/ and mirror contents match?
CLAUDE.md	Do required sections exist?

If issues are detected, fix commands are presented.

ci — CI/CD configuration

Configures GitHub Actions workflows.

# Example .github/workflows/ci.yml generation
name: CI
on:
  push:
    branches: [main]
  pull_request:
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm ci && npm test

codex — Codex CLI configuration

# Confirm installation (Codex CLI is Node.js based; separate from Harness itself)
which codex || npm install -g @openai/codex

# Check timeout command (macOS)
TIMEOUT=$(command -v timeout || command -v gtimeout || echo "")
# macOS: brew install coreutils

Note: Harness v4.0 itself (harness command) is a Node.js-free Go binary. Codex CLI (codex command) is a separate tool and still requires Node.js.

Codex provider / model metadata policy (0.123.0+ / 0.130.0)

For Codex 0.123.0+ provider/model guidance and Codex 0.130.0 stable Bedrock aws login guidance, use docs/codex-provider-setup-policy.md as the source of truth.

Key points:

• For Bedrock, use Codex built-in provider amazon-bedrock.
• Place AWS profile in user/project Codex config under [model_providers.amazon-bedrock.aws].
• Treat AWS console-login credentials from aws login profiles as AWS-side profile material.
• Harness does not write AWS credentials, console-login cache, or provider endpoints.
• Do not fix model = "gpt-5.4" as the setup default in Harness distribution Codex config.
• Do not fix model_provider = "amazon-bedrock" as the setup default in Harness distribution Codex config.
• Treat gpt-5.4 as Codex's current model metadata; do not leave old gpt-5.2-codex etc. as recommended samples.
• Do not mix Claude Code's CLAUDE_CODE_USE_BEDROCK / ANTHROPIC_DEFAULT_* / modelOverrides guidance with Codex's model_provider = "amazon-bedrock".

Only users/projects using Bedrock add the following as needed:

model_provider = "amazon-bedrock"

[model_providers.amazon-bedrock.aws]
profile = "codex-bedrock"

For Claude Code provider/MCP/telemetry guidance, refer to docs/claude-code-setup-mcp-telemetry-provider.md. In particular, ANTHROPIC_BEDROCK_SERVICE_TIER is only for Bedrock users' provider environments and must not be included in Harness plugin defaults/templates/shared project settings.

Codex app-server / plugin workflow policy (0.130.0)

For Codex 0.130.0 stable app-server/plugin workflow guidance, use docs/codex-plugin-workflows-policy.md as the source of truth.

Key points:

• codex remote-control is the explicit launch entrypoint for headless remotely controllable app-server. Harness setup does not write remote-control defaults to config.
• App-server clients can page large threads. Check the required page range for long loop/Breezing transcripts.
• view_image can resolve files via selected environments in multi-environment sessions. Include environment/workdir in artifact reports.
• Live app-server threads pick up config changes without restart. Handle secret/provider/hook policy changes with diff and verification.
• Turn diffs stay accurate across apply_patch including partial failures. Confirm with git diff and tests.
• Plugin details now show bundled hooks. Check bundled hooks before install/share; keep Harness bundled hooks opt-in.
• Plugin sharing exposes link metadata and discoverability controls. Confirm scope and metadata as release surface.
• Configurable OpenTelemetry trace metadata is limited to debugging/triage assistance; do not include personal info, customer info, or secrets.
• Built-in MCPs are first-class runtime servers. Treat as Codex runtime-owned surface; do not mix owners with plugin-provided MCPs.
• CODEX_HOME environments TOML provider is a user-level environment source. Report selected environment; fix write turns to one primary environment.
• Do not rely on "remove skills list extra roots"; explicitly use Harness mirror install or [[skills.config]] path-based loading.

Codex MCP diagnostics / plugin loading (0.123.0+)

For Codex 0.123.0+ MCP diagnostics/plugin MCP loading guidance, use docs/codex-mcp-diagnostics.md as the source of truth.

Key points:

• In the Codex TUI, normally check only server status lightly with /mcp.
• Use /mcp verbose only when an MCP server is not visible, resources are not showing, or resource templates cannot be read.
• With /mcp verbose, check diagnostics/resources/resource templates.
• Guide on the assumption that plugin .mcp.json accepts both mcpServers format and top-level server map format.
• For new plugins, prefer the more shareable mcpServers format.
• For existing plugins in top-level server map format, use Codex's improved loading and avoid unnecessary rewrites.
• Do not mix with Claude Code's claude mcp ..., .claude/mcp.json, hook type: "mcp_tool" guidance.

mcpServers format:

{
  "mcpServers": {
    "docs": {
      "command": "node",
      "args": ["server.js"]
    }
  }
}

Top-level server map format:

{
  "docs": {
    "command": "node",
    "args": ["server.js"]
  }
}

Codex sandbox / execution policy (0.123.0+)

For Codex 0.123.0+ remote_sandbox_config and codex exec shared flags guidance, use docs/codex-sandbox-execution-policy.md as the source of truth.

Key points:

• Guide remote_sandbox_config as host-specific sandbox policy in requirements.toml.
• Decide by comparing allowed_sandbox_modes per remote environment, such as remote devbox / ephemeral CI runner / shared host.
• Host matching is a convenient classification but not strong device authentication. Avoid broad wildcards in high-risk environments.
• Do not write organization-specific remote_sandbox_config in Harness distribution codex/.codex/config.toml.
• Since Codex 0.123.0, codex exec inherits root-level shared flags, so do not add duplicate --approval-policy / --sandbox pairs on the wrapper side.
• scripts/codex-companion.sh task --write adding --sandbox workspace-write is translating Harness's "write task" intent to exec-local, not duplicating root shared flags.
• scripts/codex/codex-exec-wrapper.sh's --full-auto is maintained in 53.2.4. If changed, add regression tests for approval/sandbox behavior in a separate task.

Requirements example:

allowed_sandbox_modes = ["read-only"]

[[remote_sandbox_config]]
hostname_patterns = ["devbox-*.corp.example.com"]
allowed_sandbox_modes = ["read-only", "workspace-write"]

Usage patterns (via official plugin):

bash scripts/codex-companion.sh task --write "task description"
# Or via stdin
cat /tmp/prompt.md | bash scripts/codex-companion.sh task --write

harness-mem — Memory setup

Configure Unified Harness Memory.

# Create memory directories
mkdir -p .claude/agent-memory/claude-code-harness-worker
mkdir -p .claude/agent-memory/claude-code-harness-reviewer

# Place MEMORY.md template
cat > .claude/agent-memory/claude-code-harness-worker/MEMORY.md << 'EOF'
# Worker Agent Memory

## Project Context
[Project overview]

## Patterns
[Learned patterns]
EOF

mirrors — Public skill bundle sync

On Windows with core.symlinks=false, repository symlinks become regular files and harness-* skills may not appear in the command list. Public bundles are synced as real directory mirrors.

./scripts/sync-skill-mirrors.sh
./scripts/sync-skill-mirrors.sh --check

Update targets:

• skills/
• codex/.codex/skills/
• opencode/skills/

agents — Agent configuration

Configure the 3-agent setup in agents/.

agents/
├── worker.md      # Implementation agent (task-worker + codex-implementer + error-recovery)
├── reviewer.md    # Review agent (code-reviewer + plan-critic)
└── scaffolder.md  # Scaffolding agent (project-analyzer + scaffolder)

localize — Rule localization

Adapt rules in .claude/rules/ to the current project.

# Check rule list
ls .claude/rules/

# Add project-specific rules
cat >> .claude/rules/project-rules.md << 'EOF'
# Project-Specific Rules
[Project-specific rules]
EOF

Plugin install (v2.1.71+ Marketplace)

Marketplace stability was significantly improved in v2.1.71. For plugin/managed settings policy since Claude Code 2.1.117-2.1.118, use docs/plugin-managed-settings-policy.md as the source of truth.

Recommended install method

# Pin version with @ref format (recommended)
claude plugin install owner/repo@v4.0.0

# Latest version
claude plugin install owner/repo

The owner/repo@vX.X.X format is recommended. With the @ref parser fix, tags, branches, and commit hashes all resolve accurately.

Updates

claude plugin update owner/repo

Update merge conflicts were fixed in v2.1.71, enabling stable updates.

Other improvements

• MCP server deduplication: Automatically prevents duplicate registration of the same MCP server
• /plugin uninstall uses settings.local.json: Accurately reflected in user-local settings

Managed marketplace / dependency policy (v2.1.117+)

For controlling plugin marketplace in enterprise use, use Claude Code's own managed settings. Harness does not layer its own marketplace resolver or dependency resolver on top.

Item	Purpose	Harness handling
extraKnownMarketplaces	Guide/register recommended marketplace for team	Prioritize this for normal onboarding
blockedMarketplaces	Block specific marketplace sources	Managed settings only; do not include in normal user defaults
strictKnownMarketplaces	Allow only permitted marketplace sources	Managed settings only; do not include in normal user defaults
Plugin dependency auto-resolve	Auto-install dependencies / missing dependency hints	Delegate to Claude Code itself; do not add Harness-specific resolver
Plugin themes/ directory	Plugin distributes themes	P: Future task for now; Harness does not bundle themes

DISABLE_AUTOUPDATER stops auto-updates. DISABLE_UPDATES stops even manual claude update, so it's for enterprises running fixed versions. Neither is included in Harness project defaults; organizations that need them configure via managed settings or device management.

When dependencies are missing, first check Claude Code's /plugin Errors, /doctor, claude plugin list --json. If an unregistered marketplace is the cause, register with /plugin marketplace add or claude plugin marketplace add and let the built-in auto-resolve handle it.

Maintenance — File organization

Regular maintenance tasks:

Task	Command
Delete old logs	find .claude/logs -mtime +30 -delete
Compress Plans.md	Move completed tasks to archive section
Delete old traces	tail -1000 .claude/state/agent-trace.jsonl > /tmp/trace && mv /tmp/trace .claude/state/agent-trace.jsonl

Related skills

• harness-plan — Create project plan after setup
• harness-work — Execute tasks after setup
• harness-review — Review setup configuration