AI agents use update_metadata to create or update resources in Mcp Rtfm — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Rtfm environment.
This tool modifies metadata associated with documentation files. Metadata updates are reversible changes that do not destroy data or execute arbitrary code. While metadata modification could affect search indexing or documentation organization, the impact is limited to metadata fields rather than core document content or system-level operations.
From the tool's definition Tool name 'update_metadata' and description 'Update metadata for a documentation file' indicate modification of existing data. The verb 'update' is characteristic of write operations that create or modify data reversibly.
Documented attack patterns abuse exactly the kind of access update_metadata gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Rtfm, and nothing reaches the server without passing your rules. This is the rule we recommend for update_metadata:
{
"version": "1",
"default": "deny",
"tools": {
"update_metadata": {
"limits": [
{
"counter": "update_metadata_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_metadata stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Update metadata for a documentation file. It is categorised as a Write tool in the Mcp Rtfm MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Rtfm MCP server in PolicyLayer and add a rule for update_metadata: 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 Mcp Rtfm. Nothing to install.
update_metadata is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the update_metadata 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 update_metadata. 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.
update_metadata is provided by the Mcp Rtfm MCP server (ryanjoachim/mcp-rtfm). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 11 Mcp Rtfm tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
11 Mcp Rtfm tools catalogued and risk-classified — across an index of 42,500+ MCP servers.