Advanced pattern matching to find code structures
AI agents call pattern_match_code to retrieve information from FDEP MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Pattern matching for code structures is a read-only analysis operation analogous to search or grep functionality. It analyzes existing code to identify structural patterns but does not create, modify, delete, or execute code. The broader FDEP server context (static code analysis for Haskell codebases) confirms this is introspective analysis. No side effects or external operations are triggered.
From the tool's definition Tool name is 'pattern_match_code' with description 'Advanced pattern matching to find code structures'. This is a code analysis and search operation that retrieves/queries data from static code analysis without modifying or executing anything.
Attacks that exploit this kind of access
Advanced pattern matching to find code structures. It is categorised as a Read tool in the FDEP MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FDEP MCP Server MCP server in PolicyLayer and add a rule for pattern_match_code: 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 FDEP MCP Server. Nothing to install.
pattern_match_code 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 pattern_match_code 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 pattern_match_code. 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.
pattern_match_code is provided by the FDEP MCP Server MCP server (juspay/fdep-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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