bug: coordinator.md agent prompt is compression-fragile — critical constraints likely lost under DCP #46

Summary

internal/agentkit/content/agents/coordinator.md is 22 lines and expresses the entire coordinator behavioral contract as 6 bullet points in a "Rules" section. When tools like DCP compress session context, critical constraints in this file are likely to be lost or weakened, leading to unreliable coordinator behavior.

Related to unbound-force/unbound-force#346 — same class of vulnerability (prompt constraints that do not survive context compression).

Specific Fragilities

1. Negative constraint buried in a bullet list

Line 14: - Never reserve files (workers reserve their own)

A compressor summarizing "what the coordinator does" will likely drop this prohibition. A coordinator that starts reserving files would cause deadlocks with workers trying to reserve the same files.

2. "Every" qualifier easily weakened

Line 15: - Review every worker completion (forge_review)

Compressed to "reviews worker output" — loses the mandatory-for-ALL-completions semantic. The coordinator could skip reviews for some workers, bypassing the quality gate.

3. Implicit ordering between review and complete

There is no stated ordering between forge_review and forge_complete. A compressed-context agent could call forge_complete before forge_review, bypassing quality checks entirely.

4. No identity reinforcement

The file never restates who the coordinator is or what it must NOT do in a way that would survive as a compressed summary's opening sentence. A compressor would reduce this to "Orchestrates forge work" and drop the constraints.

Proposed Hardening

• Lead with constraints before workflow (compressors prioritize opening content)
• Move critical invariants ("never reserve files", "always review before complete") into a dedicated section with a strong header that survives compression
• Add explicit ordering: "You MUST call forge_review for every worker BEFORE calling forge_complete"
• Add opening identity statement that embeds key constraints: "You are a coordinator. You orchestrate workers but NEVER reserve files or edit code directly. You MUST review every worker completion before marking it done."

References

• File: internal/agentkit/content/agents/coordinator.md
• Related: unbound-force/unbound-force#346