Server exposes 9 tools with clear naming (verb_noun pattern: coc_init, coc_add, arp_rate, etc.) and reasonable descriptions (avg ~80 chars). All tools have input schemas with type definitions and parameter descriptions. However, output schemas are NOT documented, LLMs cannot predict return structure. Parameter descriptions lack format constraints (e.g., 'score' accepts 0-100 OR 1-5 but this ambiguity is not resolved). Error handling is absent, no guidance on retryability, recovery steps, or invalid input feedback. Security model is local-file-only (good), but no audit logging or permission gates documented. Composition is sound (each tool has one responsibility), but no batch variants or pagination for list-like operations.

• Document output schema for every tool. Example: coc_status should return {length: int, agents: [string], time_span: {start: ISO8601, end: ISO8601}, event_types: {[type]: count}}. Use JSON Schema in tool definition.
• Add enum constraint to arp_rate.score or declare min/max bounds (e.g., 'score: number, range 0 - 100'). Remove ambiguous '0-100 or 1-5' phrasing.
• Add error recovery hints to descriptions. E.g., coc_verify: 'Returns integrity status. If chain not found, call coc_init first. If verification fails, check chain_meta.json for corruption.'
• Add max limit to coc_tail (e.g., 'n: integer, 1 - 1000, default 10'). Document that results are capped to prevent context window exhaustion.
• Specify coc_anchor's default TSA URL in the description or as a constant. E.g., 'tsa_url: string, optional. Defaults to https://freetimestamp.ics.forth.gr:8080 (RFC 3161 compliant).'
• Add tool annotations (readOnlyHint, destructiveHint) to distinguish safe reads (coc_verify, coc_status, coc_tail, arp_check, trust_stack_info) from writes (coc_init, coc_add, coc_anchor, arp_rate). Helps agents plan safely.