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MongoDB Model Context Protocol Server - provides tools for interacting with MongoDB instances, MongoDB Atlas, and Atlas Local deployments
MongoDB MCP server has 40 tools with consistent naming (verb_noun pattern: connect, list-databases, find, insert-many, delete-many) and basic descriptions. However, parameter descriptions are minimal (typically 1-2 lines), output schemas are not documented in the tool definitions, and error handling guidance is absent. Tool names are clear and action-oriented, but descriptions lack context about when to use each tool vs. alternatives. No tool annotations (readOnlyHint/destructiveHint) despite clear risk stratification in metadata. Parameter schemas are present but sparse, most lack constraints, ranges, or format specifications. The server follows basic patterns but falls short of production-grade documentation.
Run an aggregation pipeline on a MongoDB collection
Connect to a local Atlas deployment
Create a local Atlas deployment
Delete a local Atlas deployment
List local Atlas deployments
Get indexes for a MongoDB collection
Get the schema of a MongoDB collection
Get the storage size of a MongoDB collection
Output schemas not documented. Tool definitions lack return type specifications, forcing LLMs to guess what fields are available for downstream tool chaining. E.g., find() should document it returns {documents: [], count: number, ...}.
Parameter descriptions are minimal (1-2 words). E.g., 'filter' is described as 'Query filter' without explaining format (MongoDB query syntax), constraints, or examples. Descriptions should be 50-200 chars and include format/constraint hints.
No tool annotations despite clear risk stratification. Tools marked DESTRUCTIVE (drop-database, delete-many) lack destructiveHint annotation. Tools marked READ_ONLY lack readOnlyHint. Annotations enable agents to reason about safety and retry logic.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | D | 56 | <=2025-11-25 | v2 |
Connect to a MongoDB instance
Connect to a MongoDB Atlas cluster
Count documents in a MongoDB collection
Create an IP access list entry in MongoDB Atlas
Create a new MongoDB collection
Create a database user in MongoDB Atlas
Create a free MongoDB Atlas cluster
Create an index on a MongoDB collection
Create a new MongoDB Atlas project
Get statistics for a MongoDB database
Delete multiple documents from a MongoDB collection
Drop a MongoDB collection
Drop a MongoDB database
Drop an index from a MongoDB collection
Get execution plan for a MongoDB query
Export documents from a MongoDB collection
Find documents in a MongoDB collection
Get performance advisor recommendations for a MongoDB Atlas cluster
Insert multiple documents into a MongoDB collection
Get IP access list entries for a MongoDB Atlas project
Get details about a MongoDB Atlas cluster
List alerts for a MongoDB Atlas project
List MongoDB Atlas clusters
List all collections in a MongoDB database
List all databases in the connected MongoDB instance
List database users in a MongoDB Atlas project
List MongoDB Atlas organizations
List MongoDB Atlas projects
Get logs from a MongoDB instance
Rename a MongoDB collection
Switch to a different MongoDB connection
Update multiple documents in a MongoDB collection
No error handling guidance. Tools lack descriptions of failure modes, recovery steps, or actionable error messages. E.g., 'connection failed' should suggest 'verify connectionString format or network access'.
Parameter constraints missing. Numeric/string parameters lack min/max, regex patterns, or enum constraints. E.g., 'projectId' has no format hint; 'ipAddress' in create-access-list lacks validation guidance for CIDR blocks.