High Risk →

compress

Run memory consolidation: detects repeated episodic patterns (e.g., 'user asked about X five times') and creates semantic summaries. Reduces memory footprint in long-running sessions while preserving essential knowledge. Side effects: mutates state (additive) — creates new summary facts; original...

Part of the Nocturnusai server.

compress can trigger actions in Nocturnusai, with no limits today. PolicyLayer puts allow, deny, and rate-limit rules on every call. Live in minutes.

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AI agents invoke compress to trigger processes or run actions in Nocturnusai. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.

compress can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.

Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "compress": {
      "limits": [
        {
          "counter": "compress_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

See the full Nocturnusai policy for all 16 tools.

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These attack patterns abuse exactly the kind of access compress gives an agent. Each links to the full case and the policy that stops it:

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Every attack above starts with a tool call. PolicyLayer checks each one against your policy first, so compress only ever does what you allow.

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Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.

What does the compress tool do? +

Run memory consolidation: detects repeated episodic patterns (e.g., 'user asked about X five times') and creates semantic summaries. Reduces memory footprint in long-running sessions while preserving essential knowledge. Side effects: mutates state (additive) — creates new summary facts; original facts remain intact. Auth: requires X-Tenant-ID header; FACT_WRITE permission when auth is enabled. Rate-limited per principal. Errors: VALIDATION_ERROR on bad args.. It is categorised as a Execute tool in the Nocturnusai MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on compress? +

Register the Nocturnusai MCP server in PolicyLayer and add a rule for compress: 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 Nocturnusai. Nothing to install.

What risk level is compress? +

compress is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit compress? +

Yes. Add a rate_limit block to the compress 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.

How do I block compress completely? +

Set action: deny in the PolicyLayer policy for compress. 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.

What MCP server provides compress? +

compress is provided by the Nocturnusai MCP server (nocturnusai-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Nocturnusai tool call.

Deterministic rules across all 16 Nocturnusai tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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4,600+ MCP servers and 31,000+ tools scanned and risk-classified.

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