12 tools with mixed quality. Most have descriptions (good), but critical gaps in schema completeness and parameter documentation. 7 tools expose 'token' as a required parameter, a security anti-pattern (pattern:secret-injection). Parameter descriptions exist but lack constraints (enums, ranges, formats). No output schemas documented. Error handling absent. Naming is verb-first and clear (check_, post_, update_, delete_, pin_, unpin_, upload_, create_, stream_, update_progress, post_progress), but several tools combine multiple concerns (e.g., post_message splits long messages; upload_file uploads AND comments). Schemas visible for 10/12 tools but incomplete: missing type info on array elements, no validation rules stated in descriptions.

• Remove 'token' parameter from all tools. Inject Slack bot token server-side via environment variable (SLACK_BOT_TOKEN). Update tool descriptions to note 'Uses configured Slack bot token for authentication.'
• Document output schema for each tool. Example for post_message: 'Returns {ok: boolean, channel: string, ts: string, message: {type: string, user: string, text: string, ts: string}}'. Include all fields needed for chaining (ts for threading, channel for follow-ups).
• Add constraints to parameter descriptions. fetch_history: 'limit: number (1 - 200, default 200)'. update_progress patches: 'array of {step_index: number, status: string (pending|in_progress|completed|failed)}'.
• Add error handling guidance. Example: 'If channel not found, returns error with available channels. If permission denied, returns 403 with required scopes.' Use pattern:recovery-guide.
• Consolidate upload_file and create_canvas. Both write to Slack; consider whether they should accept optional comment/title parameters or remain separate. If separate, clarify when to use each.