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NixOS/specs/001-mcp-server/contracts/mcp-tools.md
Danilo Reyes 527fad8da0 init
2026-01-30 22:48:02 -06:00

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# MCP Tooling Contracts (JSON-RPC over stdio)
## listTools
- **Method**: `listTools`
- **Params**: none
- **Result**:
- `tools`: array of Tool objects
- `name`: string (unique)
- `description`: string
- `inputs`: array of InputParam
- `name`: string
- `type`: string (constrained to allowed primitives)
- `required`: boolean
- `description`: string
- `docsAnchor`: object
- `path`: string (under `docs/`)
- `anchor`: string (heading id)
- `summary`: string
## invokeTool
- **Method**: `invokeTool`
- **Params**:
- `name`: string (must match Tool.name)
- `args`: object (key/value per Tool.inputs)
- **Result**:
- `status`: enum (`ok`, `invalid_input`, `failed`, `unsupported`)
- `output`: string (human-readable result or guidance)
- `actions`: array of suggested follow-ups (optional)
- `docsAnchor`: object (same shape as listTools.docsAnchor) for quick navigation
## syncDocs
- **Method**: `syncDocs`
- **Purpose**: Validate that documented tools match the live catalog.
- **Params**: none
- **Result**:
- `status`: enum (`ok`, `drift_detected`)
- `missingInDocs`: array of tool names
- `missingInCatalog`: array of doc anchors without tools
- `mismatches`: array of objects
- `name`: string
- `expected`: string (description/input summary)
- `actual`: string
## Error Handling
- **Transport errors**: standard JSON-RPC error object with code/message.
- **Validation errors**: return `invalid_input` with details in `output`.
- **Unknown methods**: return `unsupported` status with guidance to run `listTools`.