CODEMESH STEP 1: Discover available tools from configured MCP servers. Use this first to see what tools are available before writing code. This is the preferred approach for complex tasks that require multiple tool calls or data processing across different MCP servers.
AI agents call discover-tools to retrieve information from Codemesh without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs information retrieval—it lists or queries the catalog of available tools from MCP servers. It has no capability to modify, execute, delete, or move money. The purpose is purely to enable visibility into the system's available capabilities, making it a safe Read operation with minimal blast radius if misused by an AI agent.
From the tool's definition The tool description explicitly states it 'Discover[s] available tools from configured MCP servers' and instructs to 'Use this first to see what tools are available.' The verb 'discover' and the action of retrieving/querying a list of available tools with no…
Documented attack patterns abuse exactly the kind of access discover-tools gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Codemesh, and nothing reaches the server without passing your rules. This is the rule we recommend for discover-tools:
{
"version": "1",
"default": "deny",
"tools": {
"discover-tools": {}
}
}discover-tools is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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CODEMESH STEP 1: Discover available tools from configured MCP servers. Use this first to see what tools are available before writing code. This is the preferred approach for complex tasks that require multiple tool calls or data processing across different MCP servers. It is categorised as a Read tool in the Codemesh MCP Server, which means it retrieves data without modifying state.
Register the Codemesh MCP server in PolicyLayer and add a rule for discover-tools: 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 Codemesh. Nothing to install.
discover-tools 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 discover-tools 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 discover-tools. 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.
discover-tools is provided by the Codemesh MCP server (kiliman/codemesh). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Codemesh, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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13 Codemesh tools catalogued and risk-classified — across an index of 43,000+ MCP servers.