Severity: CriticalStatus: OpenSQ-TOOL-CONCEALMENT
Text asks the AI model to hide actions from the user
Model-facing text instructs the AI model to hide actions or information from the user.
First seen · Last seen
eu.mmatinca/travel-trends-mcp
eu.mmatinca/travel-trends-mcp
Findings
Detected by Squatch rules from the server's metadata and protocol behavior. Latest completed scan: .
Severity: Critical5 findings
Suggested fix: Remove any wording that asks the model to act silently or withhold information from the user.
Severity: CriticalStatus: OpenSQ-TOOL-INJECTION-INSTRUCTIONS
Instructions addressed to the AI model
Model-facing text contains instructions addressed to the AI model rather than a description of the tool (for example to override prior instructions, to act before using tools, or to react to trigger phrases).
First seen · Last seen
Suggested fix: Describe what the tool does and its parameters. Do not include instructions to the model about other tools, the user or the conversation.
Severity: CriticalStatus: OpenSQ-TOOL-SENSITIVE-PATH-REFERENCE
References credential or key locations
Model-facing text references credential, key or configuration file locations unrelated to the tool's stated purpose.
First seen · Last seen
Suggested fix: Remove references to credential files, key stores and client configuration files.
Severity: CriticalStatus: 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: CriticalStatus: OpenSQ-TOOL-INJECTION-INSTRUCTIONS
Instructions addressed to the AI model
Model-facing text contains instructions addressed to the AI model rather than a description of the tool (for example to override prior instructions, to act before using tools, or to react to trigger phrases).
First seen · Last seen
Suggested fix: Describe what the tool does and its parameters. Do not include instructions to the model about other tools, the user or the conversation.
Severity: High2 findings
Severity: HighStatus: OpenSQ-TOOL-SENSITIVE-PATH-REFERENCE
References credential or key locations
Model-facing text references credential, key or configuration file locations unrelated to the tool's stated purpose.
First seen · Last seen
Suggested fix: Remove references to credential files, key stores and client configuration files.
Severity: HighStatus: OpenSQ-SERVER-AUTH-NONE-WRITE
State-changing tools available without authentication
The remote server lists state-changing tools without requiring authentication.
First seen · Last seen
Suggested fix: Require MCP authorization for servers that expose state-changing tools.
Severity: Medium2 findings
Severity: MediumStatus: OpenSQ-TOOL-INJECTION-INSTRUCTIONS
Instructions addressed to the AI model
Model-facing text contains instructions addressed to the AI model rather than a description of the tool (for example to override prior instructions, to act before using tools, or to react to trigger phrases).
First seen · Last seen
Suggested fix: Describe what the tool does and its parameters. Do not include instructions to the model about other tools, the user or the conversation.
Severity: MediumStatus: OpenSQ-TOOL-CREDENTIAL-ARGUMENT
Asks the AI model to supply credentials as arguments
A tool parameter asks the AI model to supply a password, token, key or similar credential, which the model can see and repeat.
First seen · Last seen
Suggested fix: Obtain credentials through server-side configuration or MCP authorization instead of tool arguments.
Severity: Low4 findings
Severity: LowStatus: OpenSQ-TOOL-ANNOTATION-UNDERCLAIM
Annotations understate what the tool does
The tool declares itself read-only, but its name or description indicates it changes, deletes or runs something. Clients that auto-approve read-only tools would run it without confirmation.
First seen · Last seen
Suggested fix: Set readOnlyHint to false and destructiveHint to reflect the tool's behavior.
Severity: LowStatus: OpenSQ-REPO-MISSING
No source repository linked
No source repository is linked in the registry entry.
First seen · Last seen
Suggested fix: Add a repository to server.json.
Severity: LowStatus: OpenSQ-CONFORMANCE-MODERN-FAILURE
Protocol conformance checks failed
The server failed one or more MCP protocol conformance checks.
First seen · Last seen
Suggested fix: Review the failed checks against the MCP specification.
Severity: LowStatus: OpenSQ-TOOL-LENGTH-ANOMALY
Unusually long model-facing text
Model-facing text is unusually long, which consumes context and leaves room to hide content.
First seen · Last seen
Suggested fix: Shorten descriptions; move long documentation out of model-facing fields.
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.