Single tool 'read_doc' has a reasonable description (127 chars, within 10-1024 range) and clear input schema with two parameters. However, critical gaps undermine quality: (1) Tool name lacks action verb, 'read_doc' is acceptable but 'read_vault_document' would be clearer; (2) Input schema present but parameter descriptions are minimal (doc_id: 'Document identifier in the vault' is generic; include_restricted lacks context on what 'restricted' means and consequences); (3) No output schema documented, LLM cannot predict return structure (sensitivity tier, advisory, withheld behavior); (4) No error handling guidance, what happens if doc_id is invalid? Is it retryable? (5) No pagination or result limits specified. Tool is READ_ONLY (good security posture) but lacks production-grade documentation.

• Add complete output schema documenting all return fields: doc_id, body, sensitivity_tier (enum: internal|sensitive|restricted), advisory (string or null), withheld (boolean), error cases.
• Expand parameter descriptions: 'include_restricted (boolean): If true, return documents marked restricted; if false (default), omit restricted docs and return advisory. Restricted docs are withheld for security/compliance reasons.'
• Document error cases with recovery guidance: 'If doc_id not found, returns error with available doc IDs. If user lacks permission, returns 403 with guidance to request access.'
• Add tool description context: 'Call this to retrieve vault documents with automatic sensitivity filtering. Restricted documents are withheld unless explicitly requested and user has permission.'
• If documents can be large, add optional limit/offset parameters and document max result size in description.