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mcp-pyright

mcp-pyright

by daedalus
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Hybrid

get_definition

Find where Python symbols are defined in code by analyzing a specific position. This tool helps developers navigate codebases and understand symbol origins during static analysis.

Instructions

Get definition location at a specific position.

Returns the location of the definition for the symbol at the given position.

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": {
      "code": "<code>",
      "position": "<position>"
    },
    "name": "get_definition"
  }
}

Input Schema

NameRequiredDescriptionDefault
codeYesPython code as string.
positionYesCharacter position (0-indexed) in the code.
python_pathNoOptional path to Python interpreter.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.1/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden. It mentions the tool returns a location, but doesn't disclose behavioral traits like what happens with invalid positions, whether it handles imports or external symbols, performance characteristics, or error conditions. The description is minimal and lacks operational context.

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

Conciseness5/5

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

The description is extremely concise with two sentences that directly state the action and result. It is front-loaded with the primary purpose and wastes no words, making it efficient for quick understanding.

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

Completeness3/5

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

Given the tool has an output schema (which handles return values), 100% schema coverage for inputs, and no annotations, the description is minimally adequate. However, for a code analysis tool with siblings, it lacks context on integration (e.g., how it relates to other tools) and behavioral details, leaving gaps in completeness.

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

Parameters3/5

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

Schema description coverage is 100%, so the schema already documents all three parameters (code, position, python_path) with descriptions. The description adds no additional meaning beyond what the schema provides, such as examples or edge cases, meeting the baseline for high coverage.

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 clearly states the tool's purpose with a specific verb ('Get') and resource ('definition location'), and identifies the target ('symbol at the given position'). It distinguishes from some siblings like 'format_code' or 'get_completions', but doesn't explicitly differentiate from similar tools like 'find_references' or 'get_hover'.

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 provides no guidance on when to use this tool versus alternatives. It doesn't mention sibling tools like 'find_references' (which might find usage locations) or 'get_hover' (which might provide quick info), nor does it specify prerequisites or exclusions for usage.

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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