sym-mesh-channel defines 10 tools with consistent naming (verb_noun pattern: sym_send, sym_publish, sym_recall, etc.) and reasonable descriptions (avg ~80 chars). All tools have input schemas with typed parameters and descriptions. However, schemas lack depth: no enums for constrained values (e.g., 'mood' field), no min/max bounds on numeric params, no documented output schemas. Descriptions are functional but generic, they state WHAT but rarely WHEN or WHY. Error handling is present but minimal; no recovery guidance or actionable error messages visible in schema. Security: relay credentials passed as parameters (relay_url, relay_token in sym_join_room) violate secret-injection pattern, should use env vars. Overall: solid foundation, but lacks LLM-optimization depth and production-grade error handling.

• Move relay_url and relay_token to server-side environment variables (SYM_RELAY_URL, SYM_RELAY_TOKEN in .mcp.json). Remove from sym_join_room parameters. Use env injection pattern.
• Document output schemas for all tools. E.g., sym_list_peers returns [{name: string, status: string, ...}]; sym_recall returns {messages: [{id, content, timestamp}], total: number, next_cursor?: string}.
• Add enum constraints to 'mood' parameter (e.g., ['neutral', 'positive', 'negative', 'urgent']) and document valid room names. Use isCanonicalRoom() validation and return available rooms on join failure.
• Expand descriptions to 100-150 chars with WHEN/WHY. E.g., sym_recall: 'Search local message history by keyword. Use this to find past conversations before sending new messages. Returns up to [limit] results with pagination.'
• Add error handling guidance: document which errors are retryable (network timeout) vs user-fixable (invalid room name) vs fatal (permission denied). Include recovery hints in error responses.