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The AI Client Finds a WordPress Tool but the Action Is Denied

Finding a tool proves discoverability, not authorization. Execution can still be refused by the tool schema, server policy, WordPress authentication, an Ability permission callback, a REST permission callback or the owning user’s capabilities.

Likely causes

  • The authenticated WordPress user lacks the capability required by the endpoint or tool.
  • The endpoint’s permission callback rejects the authenticated user for the requested operation.
  • The workflow requests a write while the WordPress identity is intentionally limited to reading.
  • The server or plugin intentionally exposes only a subset of tools for the active identity or configuration.
  • The credential is attached to a different WordPress user than the client expects.

Diagnostic sequence

  1. Request the MCP tool list and record the names and schemas actually exposed by the server.
  2. Compare the requested tool name and inputs with the schema returned by the active MCP server.
  3. Use a minimal authenticated identity check to confirm which WordPress user the request represents.
  4. Compare the authenticated user’s WordPress capabilities with the action required by the route or tool.
  5. Repeat one known, narrow read that should be allowed for this identity.
  6. Attempt one deliberately forbidden write to confirm that the boundary still refuses it.

Apply the smallest correction

  1. Select the lowest WordPress access level that can complete the approved action.
  2. Create a dedicated WordPress identity instead of reusing the human administrator.
  3. Correct the client endpoint, transport, tool name or credential reference without broadening WordPress permissions.
  4. Replace stale instructions with documentation tied to the installed client, plugin and version.
  5. Escalate with sanitized, versioned evidence when the behavior remains specific to the plugin.

Verify the result

  • The active MCP server lists the expected WordPress tool and current input schema.
  • The authenticated request resolves to the intended dedicated WordPress user.
  • The approved narrow read succeeds with a reproducible response.
  • The tool remains visible, but WordPress correctly refuses the action that exceeds the identity’s capability.

What not to do

  • Do not grant administrator access merely to make a connection test pass.
  • Do not treat every 403 as a broken connection; it may be the correct permission refusal.
  • Do not confuse successful authentication with permission to perform every WordPress action.
  • Do not jump from a limited identity to Full Power without a separate approved workflow, staging and rollback.
  • Do not place an Application Password, Authorization header, token or cookie in a prompt, ticket, log excerpt or screenshot.

Sources and verification

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