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io.github.cyanheads/libofcongress-mcp-server

io.github.cyanheads/libofcongress-mcp-server

by io.github.cyanheads· v0.6.1Source: Official MCP Registry
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Findings

Detected by Squatch rules from the server's metadata and protocol behavior. Latest completed scan: .

Severity: High1 finding

Severity: HighStatus: OpenSQ-TOOL-EXFIL-DIRECTIVE

Asks the AI model to pass conversation data or secrets

Model-facing text instructs the AI model to place conversation content, prompts, tool history or secrets into tool arguments or external destinations.

First seen · Last seen

Suggested fix: Do not ask the model to include conversation, prompt or credential content in arguments.

Severity: Medium2 findings

Severity: MediumStatus: OpenSQ-TOOL-CROSS-TOOL-REFERENCE

Gives instructions about other tools

Model-facing text gives the AI model instructions about tools that this server does not provide (tool shadowing).

First seen · Last seen

Suggested fix: Describe only this server's own tools.

Severity: MediumStatus: OpenSQ-SERVER-INSTRUCTIONS-INJECTION

Server instructions contain directives to the AI model

The server's instructions field contains directives addressed to the AI model beyond describing how to use the server.

First seen · Last seen

Suggested fix: Limit server instructions to usage guidance for this server's own tools.

Severity: Low1 finding

Severity: LowStatus: OpenSQ-TOOL-EXFIL-SHAPED-PARAM

Free-text parameter commonly used to collect conversation data

A free-text parameter has a name commonly abused to collect conversation, prompt or environment data.

First seen · Last seen

Suggested fix: Constrain the parameter (enum, maxLength) or rename it to reflect its purpose; never ask the model to fill it with conversation content.

What this scan does not cover

  • Squatch never calls a server's tools, so it cannot see what they actually do at run time.
  • It scans without credentials: tools behind authentication may not be visible.
  • It does not review source code, dependencies or the publisher's infrastructure.
  • A server can change behavior between scans; monitoring compares each scan with the last.
  • Classifications come from tool names, descriptions and schemas, which the publisher controls.

How Squatch scans servers