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Silvertongue: Write Like Anyone Famous

dev.silvertongue/silvertongue

by dev.silvertongue· v0.1.5Source: 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-RESOURCE-INJECTION

Resource metadata contains directives to the AI model

A resource's metadata contains instructions addressed to the AI model.

First seen · Last seen

Suggested fix: Describe resources neutrally.

Severity: Medium3 findings

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: MediumStatus: 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: 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: Low2 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-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.

1 resolved or dismissed finding
Severity: HighStatus: ResolvedSQ-RESOURCE-INJECTION

Resource metadata contains directives to the AI model

A resource's metadata contains instructions addressed to the AI model.

First seen · Last seen

Suggested fix: Describe resources neutrally.

Status history
  1. ResolvedSquatch

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