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MCP Python Interpreter

MCP Python Interpreter

by yzfly
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Hybrid

list_directory

Lists Python files in a specified directory to help users identify available scripts and modules for execution or analysis.

Instructions

List all Python files in a directory.

Args:
    directory_path: Path to directory (empty for working directory)

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_directory"
  }
}

Input Schema

NameRequiredDescriptionDefault
directory_pathNo

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv1.0.0
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "properties": {
+    "result": {
+      "title": "Result",
+      "type": "string"
+    }
+  },
+  "required": [
+    "result"
+  ],
+  "title": "list_directoryOutput",
+  "type": "object"
+}
  2. First observed

TDQS

B3.2/5.0
Behavior2/5

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

No annotations are provided, so the description carries full burden. It states what the tool does but lacks behavioral details: it doesn't specify if this is a read-only operation, what happens with invalid paths, whether it recursively searches subdirectories, what format the output takes (e.g., list of filenames, full paths), or any error conditions. The description is minimal and doesn't disclose important operational traits.

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 and well-structured: a clear purpose statement followed by a brief parameter explanation. Every sentence earns its place, with no redundant information. It's front-loaded with the core functionality, making it easy to scan and understand quickly.

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 that there's an output schema (which presumably describes the return format), the description doesn't need to explain return values. However, for a tool with no annotations and only basic parameter documentation, the description is somewhat incomplete: it doesn't address error handling, recursion behavior, or file filtering details beyond 'Python files'. It's minimally adequate but leaves gaps in understanding the tool's full behavior.

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

Parameters4/5

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

The description adds meaningful context for the single parameter: it explains that directory_path is 'Path to directory (empty for working directory)', which clarifies the default behavior when the parameter is omitted. Since schema description coverage is 0% and there's only one parameter, this compensates well. However, it doesn't detail path format requirements (e.g., absolute vs. relative) or validation rules.

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 'List all Python files in a directory' which specifies the verb (list), resource (Python files), and scope (directory). It distinguishes from siblings like list_installed_packages or list_sessions by focusing specifically on Python files in a filesystem directory. However, it doesn't explicitly contrast with all siblings, so it's not a perfect 5.

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 when to choose list_directory over other file-related tools like read_file or run_python_file, nor does it specify prerequisites or exclusions. The only contextual hint is the sibling list, but the description itself offers no usage instructions.

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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