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mcp-fstools

mcp-fstools

by devrandom
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python

read

Read file content with line numbers from a specified offset and limit. Records file hash to enforce read-before-edit consistency.

Instructions

Read a file, optionally from offset (1-based) for limit lines.

Returns line-numbered content like cat -n. Records the file's content hash so a subsequent edit can enforce must-read-first.

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": {
      "path": "<path>"
    },
    "name": "read"
  }
}

Input Schema

NameRequiredDescriptionDefault
pathYes
limitNo
offsetNo

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.7/5.0
Behavior5/5

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

Without annotations, the description fully discloses behavior: returns line-numbered content, records file hash for subsequent edit enforcement, and supports optional offset/limit. No contradictions.

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?

Four sentences, each adding value. First sentence states the main action. No redundant information. Well-structured and front-loaded.

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

Completeness5/5

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

The description covers all necessary aspects: action, optional parameters, return format (line-numbered), and side effect (hash recording). Suitable for a low-complexity read tool.

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?

Schema coverage is 0%, so description must add meaning. It explains offset as 1-based and limit as number of lines. Path parameter is not described, but the context is sufficient for a read tool.

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

Purpose5/5

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

The description clearly states the action ('Read a file'), the resource, and optional features (offset, limit). It distinguishes itself from sibling tools (edit, write) by its purpose.

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

Usage Guidelines4/5

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

The description implies when to use (reading files) and provides context about hash recording for edit enforcement. However, it does not explicitly state when not to use or mention alternatives.

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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