Strong foundation with 12 well-named tools covering Redmine's core operations. All tools have descriptions (avg 95 chars) and input schemas with typed parameters. Naming follows verb_noun convention consistently (list_*, get_*, create_*, update_*, delete_*, search_). However, output schemas are not documented, LLMs cannot predict response structure. Parameter descriptions are present but generic; many lack format constraints, ranges, or examples of valid values. Error handling is absent from visible code, no guidance on retryability, user-fixable vs fatal errors, or recovery paths. Security is well-designed (API key injection, on_behalf_of impersonation with admin checks, audit logging) but not reflected in tool definitions themselves.

• Document output schemas for all 12 tools. Specify field names, types, and which fields are always present vs optional. Example: 'Returns {issue_id: string, subject: string, status: string, assigned_to: {id: string, name: string}, created_on: ISO8601, updated_on: ISO8601, ...'
• Add format constraints to parameters: limit (1 - 100), offset (≥0), sort (enum: id|subject|status|priority|assigned_to|created_on|updated_on with :asc/:desc suffix), dates (ISO 8601 YYYY-MM-DD), tracker_id (enum: Bug|Feature|Support|etc).
• Add error recovery guidance to create_issue, update_issue, create_time_entry: 'If project_id is invalid, call list_projects() to find valid IDs. If assigned_to_id is invalid, call list_users() to resolve.'
• Implement dry-run or confirmation for delete_issue. Add optional 'confirm' parameter or split into 'preview_delete_issue' (returns what would be deleted) + 'delete_issue' (requires explicit confirmation).
• Document pagination for list_* tools: 'Returns up to {limit} results. Use offset to fetch subsequent pages. Response includes total_count so agents can plan multi-page fetches.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry