Return the exact JSON shapes (with examples) for repo files[]: the text / conversation / workflow content kinds and the repoName/path naming rules. Call this before create_repo / update_repo / publish_session if unsure how to build files[]. To publish a GENERATED RESULT (doc/web page/image/file) ...
AI agents call prompthub_describe_file_format to retrieve information from Prompthub without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool purely queries and returns documentation/schema information about PromptHub repository file formats. It has no side effects, does not execute code, does not modify data, and does not delete anything. It is a straightforward informational lookup, firmly in the Read category. Severity is low because misuse cannot cause harm — an agent querying this repeatedly wastes no resources and cannot damage data.
From the tool's definition Tool name contains 'describe' and description states 'Return the exact JSON shapes' — it retrieves and returns information about file format specifications without modifying, executing, or deleting anything.
Attacks that exploit this kind of access
Return the exact JSON shapes (with examples) for repo files[]: the text / conversation / workflow content kinds and the repoName/path naming rules. Call this before create_repo / update_repo / publish_session if unsure how to build files[]. To publish a GENERATED RESULT (doc/web page/image/file) instead of the prompt, call prompthub_describe_artifact_format. It is categorised as a Read tool in the Prompthub MCP Server, which means it retrieves data without modifying state.
Register the Prompthub MCP server in PolicyLayer and add a rule for prompthub_describe_file_format: 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 Prompthub. Nothing to install.
prompthub_describe_file_format 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 prompthub_describe_file_format 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 prompthub_describe_file_format. 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.
prompthub_describe_file_format is provided by the Prompthub MCP server (lionelhao/prompthub-mcp). 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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