| COMMAND_INVALID | Venue command requires a type. | Send one published Venue command with its required fields. |
| COMMAND_UNSUPPORTED | Venue command is not supported. | Refresh the command contract and use a published command type. |
| AUTHORIZATION_DENIED | The current principal is not authorized for this VenueMind action. | Use an assigned Organization Membership Role or an active Organization- and Project-scoped Agent Grant containing the required permission. |
| IDEMPOTENCY_KEY_REQUIRED | Idempotency key is required for mutating commands. | Retry with one stable idempotency key for this semantic action. |
| IDEMPOTENCY_KEY_CONFLICT | Idempotency key conflict. | Use the original command input or generate a new idempotency key. |
| PROPOSAL_MISMATCH | Proposal ID does not match the active Proposal. | Inspect the active Proposal and retry with its stable ID. |
| PROPOSAL_EMPTY | Proposal contains no executable Changes. | Keep accepted truth unchanged; create a Proposal only after at least one planning Change exists. |
| PLAN_VERSION_CONFLICT | Plan version conflict. | Inspect the latest Plan Version and create or rebase the Proposal before retrying. |
| VALIDATION_FAILED | Proposal validation failed. | Resolve every hard Constraint failure and validate again. |
| WARNING_WAIVER_REQUIRED | Proposal has warnings that require a human Warning Waiver. | Have a human record a reason-coded waiver for every open warning. |
| EMERGENCY_REVIEW_REQUIRED | Emergency Plan Change requires an authorized human Emergency Review. | Supply a reviewer ID, authorized reviewer role, and explicit assumption acceptance in VenueMind Studio. |