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CSOAI-ORG

OWASP Agentic MCP

check_tool_poisoning

Check a tool's name and description for poisoning by analyzing signature verification, description hash, and trust source.

Instructions

Check a tool for name/description manipulation (tool poisoning).

Behavior: This tool is read-only and stateless — it produces analysis output without modifying any external systems, databases, or files. Safe to call repeatedly with identical inputs (idempotent). Free tier: 10/day rate limit. Pro tier: unlimited. No authentication required for basic usage.

When to use: Use this tool when you need structured analysis or classification of inputs against established frameworks or standards.

When NOT to use: Not suitable for real-time production decision-making without human review of results.

Args: tool_name (str): The tool name to analyze or process. tool_description (str): The tool description to analyze or process. tool_source (str): The tool source to analyze or process. has_signature_verification (bool): The has signature verification to analyze or process. has_description_hash (bool): The has description hash to analyze or process. from_trusted_registry (bool): The from trusted registry to analyze or process. api_key (str): The api key to analyze or process.

Behavioral Transparency: - Side Effects: This tool is read-only and produces no side effects. It does not modify any external state, databases, or files. All output is computed in-memory and returned directly to the caller. - Authentication: No authentication required for basic usage. Pro/Enterprise tiers require a valid MEOK API key passed via the MEOK_API_KEY environment variable. - Rate Limits: Free tier: 10 calls/day. Pro tier: unlimited. Rate limit headers are included in responses (X-RateLimit-Remaining, X-RateLimit-Reset). - Error Handling: Returns structured error objects with 'error' key on failure. Never raises unhandled exceptions. Invalid inputs return descriptive validation errors. - Idempotency: Fully idempotent — calling with the same inputs always produces the same output. Safe to retry on timeout or transient failure. - Data Privacy: No input data is stored, logged, or transmitted to external services. All processing happens locally within the MCP server process.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tool_nameYes
tool_descriptionYes
tool_sourceNounknown
has_signature_verificationNo
has_description_hashNo
from_trusted_registryNo
callerNo
api_keyNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior5/5

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

The description discloses read-only, stateless, idempotent behavior, rate limits (10/day free, unlimited pro), authentication options, error handling, and data privacy. All claims are specific and beyond the absent annotations.

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

Conciseness4/5

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

Well-structured sections (Behavior, When to use, Args, Behavioral Transparency) but slightly verbose, with some redundancy (Behavior and Behavioral Transparency overlap). Could be tightened.

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?

Covers all essential aspects: purpose, behavior, usage guidelines, parameters, error handling, rate limits, authentication, privacy. No gaps given the presence of an output schema.

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

Parameters2/5

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

With 0% schema description coverage, the description must compensate, but parameter descriptions are generic ('to analyze or process') and sometimes misleading (e.g., api_key described as 'to analyze or process' rather than for authentication). Adds minimal value beyond property names.

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 checks for tool poisoning (name/description manipulation), a specific security analysis function. It distinguishes from sibling tools like assess_agent_security and check_prompt_injection by focusing on this niche.

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

Usage Guidelines5/5

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

Explicit 'When to use' and 'When NOT to use' sections provide clear context. Advises use for structured analysis/classification and warns against real-time production use without human review, offering strong guidance.

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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