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MongoDB MCP

MongoDB MCP

by vishnuweb-a
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

fetch_collection_data

Fetch documents from a specified MongoDB collection, using an optional limit to control how many records are returned.

Instructions

Fetch documents from a collection.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "collection_name": "<collection_name>"
    },
    "name": "fetch_collection_data"
  }
}

Input Schema

NameRequiredDescriptionDefault
limitNo
collection_nameYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.6/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of disclosing behavior, but it only states the basic action. It does not clarify whether results are paginated, how many documents are returned, or any authorization requirements.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, clear sentence without unnecessary words, which is efficient. However, it is arguably under-specified given the tool's scope, though the dimension specifically measures conciseness rather than completeness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has no output schema and no annotations, so the description must provide sufficient context for invocation. It does not state that 'limit' defaults to 100, whether all documents are returned, or how results are structured, making it incomplete for an agent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has zero description coverage for its two parameters, and the description adds no information about 'limit' or 'collection_name' beyond their names. The tool description fails to compensate for the lack of schema descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states the tool's action ('Fetch') and resource ('documents from a collection'), clearly indicating its primary function. However, it does not distinguish from sibling tools like find_document or count_documents, making it clear but at a generic level.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description offers no guidance on when to use this tool vs alternatives, such as find_document for specific queries or count_documents for counting. No exclusions or prerequisites are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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