Validate package.json file for type resolution, file existence, exports, and typesVersions configuration
AI agents call validate_package_json to retrieve information from TypeScript Tools MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool analyzes and validates the package.json configuration against defined schemas and constraints. Validation is inherently a read-only operation that queries data structure properties without side effects. Even though it examines critical configuration, it cannot execute code, modify files, delete data, or trigger external operations.
From the tool's definition Tool performs validation and checking operations ('validate', 'type resolution', 'file existence') with no indication of modification, deletion, or execution capabilities. The description uses read-only verbs (validate, check for existence).
Attacks that exploit this kind of access
Validate package.json file for type resolution, file existence, exports, and typesVersions configuration. It is categorised as a Read tool in the TypeScript Tools MCP MCP Server, which means it retrieves data without modifying state.
Register the TypeScript Tools MCP server in PolicyLayer and add a rule for validate_package_json: 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 TypeScript Tools MCP. Nothing to install.
validate_package_json 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 validate_package_json 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 validate_package_json. 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.
validate_package_json is provided by the TypeScript Tools MCP server (trkbt10/mcp-typescript-tools). 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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