Implementing ACP On WordPress

Why This Implementation Exists

ACP naming overlaps create architecture mistakes; teams need explicit protocol boundaries for agent-to-agent vs editor-to-agent vs commerce-oriented ACP variants.

Use a dedicated plugin as the protocol adapter so all protocol logic, permissions, and observability live outside your theme layer.

Protocol-specific Implementation Focus

• Choose the ACP variant by domain before writing adapters.
• Map protocol messages to internal policy and approval boundaries.
• Use conformance suites and version pinning to avoid drift.

WordPress Technical Foundation

• WordPress REST API (`/wp-json/wp/v2`) for canonical content retrieval and updates.
• Custom REST routes with `register_rest_route()` for protocol-specific actions.
• Nonce + capability checks (`wp_verify_nonce`, `current_user_can`) for every write path.
• Application Passwords or OAuth layer for service-to-service authentication.

Step-by-step Production Rollout

1. Scope the target journey. Pick one high-value flow where ACP adds deterministic value and define success metrics (latency, completion rate, human override rate).
2. Build a protocol adapter service. Keep ACP logic in a dedicated adapter layer, separate from CMS templates and page rendering concerns.
3. Map protocol contracts to WordPress primitives. Define read/write boundaries and strict schemas before implementation starts.
4. Add authentication and policy gates. Enforce least-privilege tokens, role checks, and explicit approval points for sensitive operations.
5. Implement idempotency + retries. Make long-running operations safe for replay, and include request IDs for traceability.
6. Instrument observability. Log capability calls, validation failures, latency, and user escalations with protocol-level correlation IDs.
7. Run conformance + integration tests. Validate schema contracts, permission boundaries, and rollback behavior before production.
8. Roll out progressively. Start with read-only capability exposure, then enable controlled writes, then full orchestration.

Security And Governance Controls

• Use environment-scoped secrets and rotate credentials for WordPress integrations on a fixed cadence.
• Treat protocol payloads as untrusted input; validate all schemas before execution.
• Record human approvals and denied operations for post-incident audits.
• Apply explicit write allowlists for ACP actions that mutate WordPress content or commerce state.
• Because ACP can refer to multiple standards, each implementation guide should start with explicit scope and transport assumptions.

Validation Checklist

• Contract tests for each protocol endpoint against expected schemas.
• Permission tests for editor, author, and admin roles.
• Replay/idempotency tests on retries and webhook re-delivery.

Common Failure Modes And Mitigations

• Protocol adapters executing privileged updates without `current_user_can()` checks.
• Mixing protocol logic into theme code, making upgrades brittle.
• Lack of idempotency for async retries, causing duplicate content or orders.

Official References Used In This Guide

ACP References

• Agent Communication Protocol docs
• ACP API specification example
• Agent Client Protocol docs
• Agent Client Protocol overview
• IBM ACP overview
• Zed ACP interoperability page
• JetBrains ACP reference

WordPress References

• WordPress REST API handbook
• Plugin REST API guide
• WordPress nonce security