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For the complete documentation index, see llms.txt. Markdown versions of all docs pages are available by appending .md to any docs URL.

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Mirroring

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Send copies of requests to alternative backends for shadow testing.

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Backend

Agentgateway supports more than one configuration style. Where a feature can also be configured in the simplified llm or mcp modes, the examples on this page show each option in tabs. For more information, see Routing-based configuration.

Request mirroringMirroringA resiliency feature that sends a copy of requests to an additional backend for testing or analysis, without affecting the primary request flow. allows sending a copy of each request to an alternative backend. These requests will not be retried if they fail.

# yaml-language-server: $schema=https://agentgateway.dev/schema/config
mcp:
  port: 3000
  policies:
    requestMirror:
      backend:
        host: localhost:8080
      # Mirror 50% of requests
      percentage: 0.5
  targets:
  - name: everything
    stdio:
      cmd: npx
      args: ["@modelcontextprotocol/server-everything"]
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