This MCP server has critical gaps in definition quality. Tool schemas contain invalid JSON Schema types ('type: "id"', 'type: "list of strings"') that will not validate. Descriptions are present but generic (e.g. 'Searches for an entity in the knowledge graph', 72 chars, below the 194-char baseline). Parameter descriptions exist but lack specificity about formats, constraints, and return values. No output schema is documented for any tool. Error handling is absent, there is no guidance on what to do if an entity is not found or a relationship fails. The server follows basic MCP patterns (tools are registered, have names and descriptions) but lacks the rigor expected of production tools.

• Fix JSON Schema type declarations: change 'type: "id"' to 'type: "string", "description": "UUID or numeric ID returned by set-entity"'; change 'type: "list of strings"' to 'type: "array", "items": {"type": "string"}'.
• Document the output schema for each tool. For set-entity, document that it returns {"id": string, "message": string}. For search-entity, document that it returns an array of {"id": ..., "name": ..., "type": ..., "content": ...}.
• Ensure field naming consistency: if set-entity returns 'id', then set-relationship should accept a parameter named 'entity_id' or clarify in the description that source_entity_id is the value returned from set-entity.
• Add actionable error guidance to descriptions. E.g. 'If the entity is not found, call search-entity first to retrieve its ID.' Expand tool descriptions to 150 - 250 characters, following the 194-char baseline.
• Add pagination support to search-entity: include 'limit' (default 20, range 1 - 100) and 'offset' (default 0) parameters, and document in the description that results are capped at 100 per call.
• Clarify the 'content' parameter: specify max length (e.g. 5000 chars), allowed characters, and provide an example. E.g. 'A list of strings, each up to 500 chars, describing the entity. Example: ["Founded in 2020", "Builds AI tools", "HQ in San Francisco"]'.
• Add output field documentation to every parameter description. E.g. 'Call this first to get the entity_id, which is required by set-relationship.'
• For set-entity and set-relationship, add to descriptions: 'This operation modifies the knowledge graph. Results are idempotent, calling twice with the same parameters produces the same outcome.' This clarifies retry safety.