c4_search

A read tool on the C4REQBER MCP server.

SERVERC4REQBER SOURCEC4MIND/C4REQBER

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/c4reqber/c4-search.md

WHAT IT DOES

What c4_search does on C4REQBER

AI agents call c4_search to retrieve information from C4REQBER without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why c4_search is rated Low

Search tools retrieve or query data without modifying state. Given the empty description and the read-only nature of the server, this is classified as a Read operation with low severity. Confidence is moderate (0.7) due to the missing tool description, which would normally provide more specific evidence of the tool's exact behavior.

From the tool's definition Tool name 'c4_search' suggests a search operation. Server description indicates this is a 'Read-only mirror' with a 'discovery pipeline', and 'agent_search' is listed as a sibling tool, implying search functionality is part of the read-only interface.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs c4_search safely

PolicyLayer is an MCP gateway: it sits between your AI agents and C4REQBER, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For c4_search, this is the rule to start with:

c4_search Allowed

c4_search is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "c4_search": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect C4REQBER, apply this rule, and every c4_search call is checked against it from then on.

FAQ

Questions about c4_search

What does the c4_search tool do? +

c4_search is a read tool on the C4REQBER MCP server. It is categorised as a Read tool in the C4REQBER MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on c4_search? +

Register the C4REQBER MCP server in PolicyLayer and add a rule for c4_search: 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 C4REQBER. Nothing to install.

What risk level is c4_search? +

c4_search is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit c4_search? +

Yes. Add a rate_limit block to the c4_search 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 c4_search completely? +

Set action: deny in the PolicyLayer policy for c4_search. 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 c4_search? +

c4_search is provided by the C4REQBER MCP server (C4MIND/C4REQBER). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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All 32 C4REQBER tools →

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