Read one manual chunk by id to ground your answer in the manufacturer's documentation — the drill-in partner to get_module's manual_outline. Use it when a claim (voltage range, behavior, calibration step) benefits from the source's own account. Read the chunk, then answer in your own words and po...
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AI agents call get_manual_chunk 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_manual_chunk 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_manual_chunk": {}
}
}See the full Eurorack policy for all 17 tools.
These attack patterns abuse exactly the kind of access get_manual_chunk 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.
Read one manual chunk by id to ground your answer in the manufacturer's documentation — the drill-in partner to get_module's manual_outline. Use it when a claim (voltage range, behavior, calibration step) benefits from the source's own account. Read the chunk, then answer in your own words and point the user to the source (audit_url) to verify. Paraphrase the substance; do not paste the chunk back as your reply. Quote verbatim only when the exact wording is load-bearing for a specific contested detail, and then only a short phrase. Citation style is SKILL.md §8 (cite-and-point, don't reproduce). text is capped (~800 chars): enough to ground an answer, not to reproduce the manual. If truncated:true, a " […]" marks the cut and the full passage is at audit_url — send the user there for the rest rather than stitching chunks together to rebuild it. When to call: - You have a chunk_id from get_module's manual_outline that looks relevant to the question. - You're writing an answer with specific technical claims and want the source's account to ground (and, if needed, briefly cite) it. - The user asked a prose-shaped question ("what does the manual say about X?") — read the chunk, then explain it in your own words with a link to verify. Prefer get_manual_chunk over search_manual when: - You already have the chunk_id from get_module's manual_outline. - You want exactly one chunk, not a ranked list. Returns: { "chunk_id": number, "source_id": number, "source_type": string, // "manual" | "product_page" | "firmware_notes" "source_title": string | null, "heading_path": string | null, // e.g. "Calibration > Tuning Procedure" "text": string, // chunk text, capped ~800 chars; paraphrase, don't paste "truncated": boolean, // true if text was trimmed; full passage at audit_url "audit_url": string // human-readable audit page for the source } Errors: - "Manual chunk not found: <id>" if the chunk_id doesn't exist.. 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_manual_chunk: 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_manual_chunk 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_manual_chunk 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_manual_chunk. 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_manual_chunk 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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