# Coordinator Source Of Truth

> The complete file-by-file source-of-truth hierarchy for Squad: which files are authoritative, which are derived/append-only, who may write each one, who may read each one, and the precedence rules when they conflict. Squad coordinator loads this on demand when it needs to resolve a write conflict, decide where a piece of state belongs, or answer a 'who owns this file' question.

- Skill: `gabrielmoreira/coordinator-source-of-truth` (Agent Skill)
- Install (CLI): `npx skillmds@latest add gabrielmoreira/coordinator-source-of-truth`
- Raw SKILL.md: https://api.skillmd.com/api/skills/gabrielmoreira/coordinator-source-of-truth/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: gabrielmoreira (https://skillmd.com/u/gabrielmoreira)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/gabrielmoreira/coordinator-source-of-truth

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> **Load this skill when:** the coordinator (or any agent) needs to resolve a "where does this state belong?" or "who is allowed to write this file?" question — e.g., when about to write `.squad/decisions.md`, when reviewing whether an agent broke the append-only rule, when answering a user question about Squad's file layout, or when adjudicating a conflict between two files. The short summary in `squad.agent.md` is for routing; this skill is the full reference.

## State backend note

Files below marked as **"Derived / append-only"** are **mutable state** — agents access them with runtime state tools (`squad_state_read`, `squad_state_write`, `squad_state_append`, `squad_state_delete`, `squad_state_list`). The runtime decides whether the configured backend stores them on disk, git-native state, or an external provider. Files marked as **"Authoritative"** are **static config** and always live on disk regardless of backend.

## File hierarchy

| File | Status | Who May Write | Who May Read |
|------|--------|---------------|--------------|
| `.github/agents/squad.agent.md` | **Authoritative governance.** All roles, handoffs, gates, and enforcement rules. | Repo maintainer (human) | Squad (Coordinator) |
| `.squad/decisions.md` | **Authoritative decision ledger.** Single canonical location for scope, architecture, and process decisions. | Squad (Coordinator) — append only | All agents |
| `.squad/team.md` | **Authoritative roster.** Current team composition. | Squad (Coordinator) | All agents |
| `.squad/routing.md` | **Authoritative routing.** Work assignment rules. | Squad (Coordinator) | Squad (Coordinator) |
| `.squad/ceremonies.md` | **Authoritative ceremony config.** Definitions, triggers, and participants for team ceremonies. | Squad (Coordinator) | Squad (Coordinator), Facilitator agent (read-only at ceremony time) |
| `.squad/casting/policy.json` | **Authoritative casting config.** Universe allowlist and capacity. | Squad (Coordinator) | Squad (Coordinator) |
| `.squad/casting/registry.json` | **Authoritative name registry.** Persistent agent-to-name mappings. | Squad (Coordinator) | Squad (Coordinator) |
| `.squad/casting/history.json` | **Derived / append-only.** Universe usage history and assignment snapshots. | Squad (Coordinator) — append only | Squad (Coordinator) |
| `.squad/agents/{name}/charter.md` | **Authoritative agent identity.** Per-agent role and boundaries. | Squad (Coordinator) at creation; agent may not self-modify | Squad (Coordinator) reads to inline at spawn; owning agent receives via prompt |
| `.squad/agents/{name}/history.md` | **Derived / append-only.** Personal learnings. Never authoritative for enforcement. | Owning agent (append only), Scribe (cross-agent updates, summarization) | Owning agent only |
| `.squad/agents/{name}/history-archive.md` | **Derived / append-only.** Archived history entries. Preserved for reference. | Scribe | Owning agent (read-only) |
| `.squad/orchestration-log/` | **Derived / append-only.** Agent routing evidence. Never edited after write. | Scribe | All agents (read-only) |
| `.squad/log/` | **Derived / append-only.** Session logs. Diagnostic archive. Never edited after write. | Scribe | All agents (read-only) |
| `.squad/templates/` | **Reference.** Format guides for runtime files. Not authoritative for enforcement. | Squad (Coordinator) at init | Squad (Coordinator) |
| `.squad/rai/policy.md` | **Authoritative RAI policy.** Check categories, terminology standards, and opt-out rules. | Squad (Coordinator) at init; Rai may propose updates via decisions inbox | Rai, All agents (read-only) |
| `.squad/rai/audit-trail.md` | **Derived / append-only.** RAI review evidence log. Redacted — never contains raw secrets or harmful content. | Rai (append only) | Rai, Squad (Coordinator) |
| `.squad/fact-checker/policy.md` | **Authoritative verification + Devil's Advocate policy.** Confidence rating taxonomy, hard anti-fabrication rules, mode triggers, opt-out model. | Squad (Coordinator) at init; Fact Checker may propose updates via decisions inbox | Fact Checker, All agents (read-only) |
| `.squad/fact-checker/audit-trail.md` | **Derived / append-only.** Verification verdicts + DA brief evidence log. Succinct — verdict + citation, never raw source material. | Fact Checker (append only) | Fact Checker, Squad (Coordinator) |
| `.squad/plugins/marketplaces.json` | **Authoritative plugin config.** Registered marketplace sources. | Squad CLI (`squad plugin marketplace`) | Squad (Coordinator) |

## Rules

1. **If `squad.agent.md` and any other file conflict, `squad.agent.md` wins.** It is the only file with hard governance authority.
2. **Append-only files must never be retroactively edited** to change meaning. They are diagnostic and audit-trail material. Corrections go in a new entry that references the prior one.
3. **Agents may only write to files listed in their "Who May Write" column above.** Violations are a contract bug; runtime state-backends will refuse the write on non-local backends.
4. **Non-coordinator agents may propose decisions** in their responses, but only Squad (Coordinator) records accepted decisions in `.squad/decisions.md`.