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  • OpenCode ACP: Why Two Clients Break the Connection

    Here’s the scenario: You have OpenCode running as your ACP agent. IntelliJ IDEA connects via one plugin. AgentBridge connects via another. Both work fine individually. Run them at the same time? One breaks.

    This isn’t a bug in your IDE plugin. It’s not a bug in AgentBridge. It’s an architectural property of how OpenCode’s ACP transport works.

    The ACP Transport: stdio

    OpenCode’s opencode acp command uses stdio transport — JSON-RPC 2.0 messages flow over a single stdin/stdout pipe. The relevant code in packages/opencode/src/cli/cmd/acp.ts creates one WritableStream for stdout and one ReadableStream for stdin. These are wrapped by ndJsonStream from the @agentclientprotocol/sdk for newline-delimited JSON framing.

    opencode acp debugging architecture tools Created Sat, 08 Aug 2026 00:00:00 +0000