Server-side retrieval of an allowlisted source URL. Extracts plain text (first 64 kB) via pdf-parse/readability. SSRF-hardened. 24h cached. URL MUST exist in the DB allowlist.
Risk signalsAccepts URL/endpoint input (url)
Part of the Menjometre server.
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AI agents call fetch_source_document to retrieve information from Menjometre without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though fetch_source_document only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"fetch_source_document": {}
}
}See the full Menjometre policy for all 48 tools.
These attack patterns abuse exactly the kind of access fetch_source_document gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Server-side retrieval of an allowlisted source URL. Extracts plain text (first 64 kB) via pdf-parse/readability. SSRF-hardened. 24h cached. URL MUST exist in the DB allowlist.. It is categorised as a Read tool in the Menjometre MCP Server, which means it retrieves data without modifying state.
Register the Menjometre MCP server in PolicyLayer and add a rule for fetch_source_document: 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 Menjometre. Nothing to install.
fetch_source_document 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 fetch_source_document 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 fetch_source_document. 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.
fetch_source_document is provided by the Menjometre MCP server (segellfosc-dev-ayfx/menjometre). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 48 Menjometre tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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