MCP Python Interpreter

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

With no annotations provided, the description carries full burden and does well by disclosing key behavioral traits: it reads file content, has size limits for safety, and returns either content or an error message. It doesn't mention permissions, rate limits, or specific error types, but covers the core behavior adequately.

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

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

Perfectly structured with a clear purpose statement followed by Args and Returns sections. Every sentence earns its place - the safety note is valuable, and the parameter explanations are essential given the 0% schema coverage.

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

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

For a 2-parameter tool with no annotations and no output schema, the description provides good coverage: purpose, parameters, return behavior, and safety considerations. It doesn't explain the exact format of error messages or provide examples, but is largely complete for this complexity level.

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

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

With 0% schema description coverage, the description fully compensates by explaining both parameters: file_path ('Path to the file (relative to working directory or absolute)') and max_size_kb ('Maximum file size to read in KB (default: 1024)'). This adds essential meaning beyond the bare schema.

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

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

The description clearly states the specific action ('Read the content of any file') and resource ('file'), distinguishing it from sibling tools like write_file or list_directory. It provides a complete verb+resource+scope statement with the size limit qualification.

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

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

The description implies usage context through the size limit safety note, but doesn't explicitly state when to use this tool versus alternatives like write_file or list_directory. No explicit when-not or alternative guidance is provided.

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