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A Model Context Protocol server for MongoDB integration with Claude
MongoDB MCP server has 16 tools with complete input schemas and descriptions. Naming follows verb_noun convention (aggregate, find, insert, delete). Descriptions are present but generic (avg ~60 chars, below 194-char baseline). Parameters are well-typed with constraints (limits, defaults, enums implicit). Critical gaps: no output schemas documented, no error handling guidance, no tool annotations (readOnlyHint/destructiveHint), no pagination support for list operations. Security concern: no mention of permission gates for destructive operations (deleteOne, deleteMany, dropCollection). Composition is sound, each tool has one responsibility. Schema quality is good (types, descriptions, constraints present), but output documentation is entirely absent.
Run a MongoDB aggregation pipeline
Count documents matching a query
Delete multiple documents from a collection
Delete a single document from a collection
Get distinct values for a field in a collection
Drop (delete) an entire collection
Get the execution plan for an aggregation pipeline
No output schemas documented. LLMs cannot plan downstream calls or extract required fields (e.g., does find() return _id, count, matched_count?). Every tool lacks return type specification.
Destructive operations (deleteOne, deleteMany, dropCollection) lack confirmation/dry-run support and no permission gates documented. Agents can irreversibly delete data without safeguards.
No tool annotations (readOnlyHint, destructiveHint, idempotentHint). Clients cannot distinguish safe reads from destructive writes at parse time. All 16 tools lack risk metadata.
Inferred effective spec: <=2025-11-25.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | D | 57 | <=2025-11-25 | v2 |
Find documents matching a query
Find a single document matching a query
Insert multiple documents into a collection
Insert a single document into a collection
List all collections in the database
List all databases on the MongoDB server
Get random sample documents from a collection
Update multiple documents in a collection
Update a single document in a collection
List operations (listCollections, listDatabases) lack pagination (limit, offset, next_cursor). Large result sets will blow context window. No total count returned.
Descriptions are generic and under 100 chars (avg ~60). Missing WHEN to use, prerequisites, and state-change warnings. E.g., 'Delete a single document' does not warn that this is irreversible or require confirmation.