> ## Documentation Index
> Fetch the complete documentation index at: https://docs.flintai.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Poisoned tool descriptor

> Tool definition or MCP server descriptor has been modified to redirect agent actions

Tool definition or MCP server descriptor has been modified to redirect agent actions

## How to resolve

Verify tool definitions against a trusted registry. Pin tool versions and validate checksums. Monitor for changes to tool schemas at runtime.

## Risk

**Governance/Compliance**

This vulnerability falls under [ASI02:2026 — Tool Misuse and Exploitation](https://genai.owasp.org/resource/owasp-top-10-for-agentic-applications-for-2026/) in the OWASP Top 10 for Agentic Applications. Agent uses legitimate tools in unsafe ways due to over-privilege, bad input, or poisoned descriptors.

**Security**

Tool definition or MCP server descriptor has been modified to redirect agent actions. If exploited, this can compromise the agent's integrity, confidentiality, or availability, potentially affecting downstream systems and data.

## Explanation

Tool definition or MCP server descriptor has been modified to redirect agent actions. This falls under ASI02 (Tool Misuse and Exploitation): Agent uses legitimate tools in unsafe ways due to over-privilege, bad input, or poisoned descriptors.

## Specifications

**Trigger**

* Agent scan detects tool definition or MCP server descriptor has been modified to redirect agent actions

The scanner looks for patterns such as:

* tool definition loaded from external or unverified source
* MCP server URL not pinned or verified
* dynamic tool registration without manifest signing

**Severity**

* HIGH

**Applies to**: Agent