Return provenance metadata for one source by integer source_id. Sources include manufacturer manuals, product pages, firmware notes, schematics, errata, and (in v2) field notes. Source ids are surfaced wherever facts cite their origin — in get_module's reference list, in the audit page citation l...
Part of the Eurorack server.
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AI agents call get_source to retrieve information from Eurorack 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 get_source 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": {
"get_source": {}
}
}See the full Eurorack policy for all 17 tools.
These attack patterns abuse exactly the kind of access get_source 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.
Return provenance metadata for one source by integer source_id. Sources include manufacturer manuals, product pages, firmware notes, schematics, errata, and (in v2) field notes. Source ids are surfaced wherever facts cite their origin — in get_module's reference list, in the audit page citation links, and (in v2) in the claims table. Args: - source_id (integer, required) Returns metadata only — not the document content. The audit_url field links to the audit site's per-source page where the document can be viewed. The archived_url field is a path on the worker that streams the archived bytes from R2 (e.g. /sources/123/document). Returns: { "id": number, "source_type": "manual" | "firmware_notes" | "product_page" | ..., "format": "pdf" | "html" | "text" | ..., "title": string | null, "canonical_url": string, // manufacturer-hosted URL "archived_url": string | null, // worker route to the R2-archived copy "content_hash": string | null, // sha256 of archived bytes "fetched_date": string, // when first archived "last_verified": string | null, // when canonical was last confirmed "canonical_changed_at": string | null, // null until manufacturer side changes "module_id": string | null, // owning module, if any "manufacturer_id": string | null, "audit_url": string // audit site page for this source } The pair (canonical_changed_at, last_verified) is the staleness signal: if canonical_changed_at > last_verified, the manufacturer document changed since we last checked it. Surface that to the user when relevant.. It is categorised as a Read tool in the Eurorack MCP Server, which means it retrieves data without modifying state.
Register the Eurorack MCP server in PolicyLayer and add a rule for get_source: 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 Eurorack. Nothing to install.
get_source 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 get_source 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 get_source. 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.
get_source is provided by the Eurorack MCP server (https://eurorackref.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 17 Eurorack tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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