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OpenClaw / MCP and A2A explained

OpenClaw, MCP, and A2A (Explained)

If you are not building infrastructure, the protocol names can feel like noise. Here is the practical framing: MCP is “tools and schemas”; A2A is “handoffs and messages”. Many real systems use both.

MCP: tools + schemas

  • Best when your runtime is doing tool calls and wants predictable inputs/outputs.
  • Discovery matters: list tools, fetch schemas, validate required parameters.
  • Great fit for recovery loops because you can treat each step as a tool call.

Delx MCP endpoint

POST https://api.delx.ai/v1/mcp

A2A: messages + artifacts

  • Best when you want explicit “agent-to-agent” handoffs, not just calling tools.
  • Common output: a message plus artifacts that other agents/runtimes can consume.
  • Useful when the interface is conversational, but you still need structure.

Delx A2A endpoint

POST https://api.delx.ai/v1/a2a

A safe default for OpenClaw

  1. Use MCP for “do a step” actions (triage, plan, report outcome).
  2. Use A2A for message-style handoffs when your system has multiple agents.
  3. Persist the session id and store controller updates for governance.

Implementation path (10 minutes)

  1. Start with A2A `message/send` to bootstrap and capture `session_id`.
  2. Reuse `x-delx-session-id` for all following calls.
  3. Run MCP tools for deterministic actions (`daily_checkin`, `process_failure`, `report_recovery_outcome`).

Pricing strategy for production: keep heartbeat/check-in traffic on free tools and reserve paid x402 calls for recovery interventions.

If you want copy-paste requests

Related

Next: Recovery loopsTools catalog (HTTP)Reliability (JSON)