SKILL: Squad CLI Internals — Version Stamping & Upgrade Mechanics

Confidence: medium Discovered by: repository investigation Date: 2026-05-26 Validated in: Issue #1173 recon (bradygaster/squad)

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What This Skill Covers

Reusable knowledge about how @bradygaster/squad-cli stamps its version into squad.agent.md, how squad upgrade works, what it preserves vs. overwrites, and how to probe the npm registry for the latest version from a coordinator prompt.

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Package & Registry Facts

• Package name: @bradygaster/squad-cli
• Registry: npm (public)
• CLI binary: squad (registered via package.json#bin.squad)
• Node version requirement: Node ≥22.5.0 (ESM-only codebase)

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Version Stamping Mechanism

Source file: dist/cli/core/version.js

Three functions:

getPackageVersion()

Walks up from the compiled JS file to find package.json. Returns pkg.version. Works from both dist/cli/core/version.js and a bundled root cli.js. Returns '0.0.0' as fallback if not found.

stampVersion(filePath, version)

Mutates squad.agent.md in three places:

1. HTML comment: <!-- version: {version} --> (must be on the line immediately after frontmatter ---)
2. Identity line: - **Version:** {version}
3. Greeting instruction: backtick-quoted `Squad v{version}`

Called by: both init and upgrade — after copying the template to the destination.

readInstalledVersion(filePath)

Reads the stamped version back from squad.agent.md:

1. First tries HTML comment format: /<!-- version: ([0-9.]+(?:-[a-z]+(?:\.\d+)?)?) -->/
2. Falls back to old frontmatter format: /^version:\s*"([^"]+)"/m
3. Returns '0.0.0' on any error

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squad upgrade Behavior

Source file: dist/cli/core/upgrade.js

What gets overwritten:

• squad.agent.md — full overwrite from template, then stampVersion()
• Files with overwriteOnUpgrade: true in TEMPLATE_MANIFEST: casting JSON files, template .md files, copilot-instructions.md (if @copilot enabled)
• GitHub Actions workflows — from templates/workflows/; non-npm projects get type-aware stubs
• Runs runMigrations() after file copy

What is PRESERVED:

• team.md, routing.md, decisions.md, ceremonies.md (user-owned)
• agents/*/history.md (individual agent memory)
• .squad/config.json — never touched; stateBackend survives intact
• User-added files not in TEMPLATE_MANIFEST

Self-upgrade path (selfUpgradeCli()):

Detects npm/pnpm/yarn via npm_execpath and npm_config_user_agent. Runs:

• npm: npm install -g @bradygaster/squad-cli@latest
• pnpm: pnpm add -g @bradygaster/squad-cli@latest
• yarn: yarn global add @bradygaster/squad-cli@latest Use @insider tag for insider builds.

compareSemver(a, b) utility (in upgrade.js):

Returns -1/0/1. Handles pre-release: strips pre-release for base comparison, then treats pre-release as less than release (e.g., 0.9.5-insider.1 < 0.9.5). Can be ported directly if needed in prompt logic.

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.squad/config.json — What It Holds

{
  "version": 1,
  "stateBackend": "worktree"
}

Other optional fields added by the coordinator at runtime:

• defaultModel — global model override for all agent spawns
• agentModelOverrides.{agentName} — per-agent model override

The file is read-only from the upgrade path's perspective. Only the coordinator writes to it (for model preferences).

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Version-Check Probe (npm Registry)

Use this one-liner from inside a coordinator prompt to fetch dist-tags:

npm view @bradygaster/squad-cli dist-tags --json

• Timeout: 5 seconds. If no response within 5 seconds, abandon and show normal greeting.
• On success: extract dist-tags[channel] (e.g., dist-tags["insider"]).
• On any error (network failure, registry unreachable, parse error): show normal greeting.

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Upstream OS-Specific Cache

The CLI (self-update.ts) writes latest version info to an OS-specific path with a 24h TTL.

One-liner to read the upstream cache:

node -e "const p=require('path'),o=require('os');const b=process.env.APPDATA||(process.platform==='darwin'?p.join(o.homedir(),'Library','Application Support'):p.join(o.homedir(),'.config'));const f=p.join(b,'squad-cli','update-check.json');try{const d=JSON.parse(require('fs').readFileSync(f,'utf8'));const age=Date.now()-d.checkedAt;if(age<86400000)console.log(JSON.stringify(d));else console.log('STALE')}catch{console.log('MISS')}"

Output semantics:

• Valid JSON {"latestVersion":"X.Y.Z","checkedAt":N} → cache hit; use latestVersion
• STALE → cache expired (older than 24h); treat as no data
• MISS → cache missing or corrupt; treat as no data

OS-specific cache path:

• Windows: %APPDATA%\squad-cli\update-check.json
• Linux: ~/.config/squad-cli/update-check.json
• macOS: ~/Library/Application Support/squad-cli/update-check.json

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Repo-Local Cache Convention: .squad/.cache/version-check.json

Used by coordinator for insider/preview channels (the upstream cache only stores latest).

Schema:

{
  "checkedAt": "2026-05-26T14:13:28.492Z",
  "currentVersion": "0.9.6-insider.2",
  "channel": "insider",
  "channelVersion": "0.9.7-insider.1"
}

TTL: 24 hours from checkedAt. Gitignore: .squad/.cache/ is listed in .gitignore — cache files are never committed.

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Key File Paths (installed CLI)

Purpose	Path
Version utilities	dist/cli/core/version.js
Upgrade logic	dist/cli/core/upgrade.js
Init logic	dist/cli/core/init.js
Template manifest	dist/cli/core/templates.js
Copilot install helper	dist/cli/copilot-install.js
squad.agent.md template	templates/squad.agent.md.template
Session init reference	templates/session-init-reference.md
All templates	templates/