AI agents call xcode_validate_signing to retrieve information from Xcode without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads and validates the signing status of an app bundle, similar to a status check or inspection. It has no side effects—it does not modify the app, execute code, delete anything, or move money. It falls squarely in the Read category. The severity is low because misuse would only expose information about code signing validity, which is non-sensitive metadata.
From the tool's definition The tool 'xcode_validate_signing' performs validation (checking/verification) of code signing on an app bundle. The verb 'validate' indicates inspection and reporting of status, not modification, deletion, or execution of arbitrary code.
Attacks that exploit this kind of access
Validate code signing of an app bundle. It is categorised as a Read tool in the Xcode MCP Server, which means it retrieves data without modifying state.
Register the Xcode MCP server in PolicyLayer and add a rule for xcode_validate_signing: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Xcode. Nothing to install.
xcode_validate_signing is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the xcode_validate_signing rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for xcode_validate_signing. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
xcode_validate_signing is provided by the Xcode MCP server (raunaksplanet/xcode-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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