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crunchtools

io.github.crunchtools/airlock

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by crunchtools

safe_read_tool

Read local text files with injection detection and sanitization. Rejects binary files and flagged content to prevent prompt injection.

Instructions

Read local file with Layer 1 sanitization. Fails if injection detected.

Text files only (markdown, source code, config). Binary files rejected.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pathYesPath to the file to read

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior5/5

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

Despite no annotations, the description fully discloses behavioral traits: sanitization level (Layer 1), failure on injection, and file type constraints. This provides clear expectations for the agent.

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?

Three brief sentences convey the tool's purpose, constraints, and failure mode with zero waste. Well structured and front-loaded.

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

Completeness4/5

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

Given one required parameter and an output schema (implied by context), the description is complete. Minor gap: could mention relation to sibling tools, but not essential.

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?

The input schema has 100% coverage with a single 'path' parameter. The description adds no additional meaning beyond what the schema already provides.

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 tool reads a local file with Layer 1 sanitization, distinguishing it from siblings by specifying file type restrictions and injection failure handling.

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 usage for text files and rejection of binaries, suggesting when not to use it. However, it does not explicitly list alternatives among the many sibling tools.

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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