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headquarter/openspec/changes/instance-health-monitoring/specs/tool-instances/spec.md
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Fusion d5f9df33b7 feat(frontend): update sessions page for enhanced health monitoring
- Add new status badges: starting, probing, unhealthy
- Show tunnel error only when tunnel_status is unreachable
- Show app error badge with status code for error_response
- Add collapsible probe output section for diagnostics
- Update health polling to check all active instances
- Only show Recreate Tunnel button for unreachable tunnels
2026-05-22 21:26:05 +02:00

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## MODIFIED Requirements
### Requirement: Status Monitoring
The system SHALL track tool status with startup and health states.
#### Scenario: Status check with health details
- **GIVEN** a tool instance
- **WHEN** status is queried
- **THEN** the real-time container status is returned:
- `pending`: Instance created, container not yet started
- `starting`: Container is running, readiness probe in progress
- `running`: Container is running and probe passed (or terminal tool)
- `unhealthy`: Container is running but probe failed/timed out
- `stopped`: Container was stopped by user
- `error`: Container failed to start or crashed
## ADDED Requirements
### Requirement: Health check endpoint enhancement
The system SHALL provide detailed health information through the health check endpoint.
#### Scenario: Health check with container and tunnel status
- **GIVEN** a running instance
- **WHEN** `GET /instances/{id}/health` is called
- **THEN** the response includes:
- `healthy`: boolean - overall health
- `container_status`: "running", "exited", "restarting", or "not_found"
- `tunnel_status`: "healthy", "unreachable", "error_response", or "not_applicable"
- `tunnel_status_code`: HTTP status code or null
- `probe_status`: "passed", "failed", "pending", or "not_configured"
- `last_probe_output`: string or null
### Requirement: Smart tunnel recreation
The system SHALL only allow tunnel recreation when the tunnel itself is broken.
#### Scenario: Recreate tunnel for unreachable tunnel
- **GIVEN** an instance with `tunnel_status: "unreachable"`
- **WHEN** the recreate tunnel endpoint is called
- **THEN** the tunnel is recreated
- **AND** the new URL is returned
#### Scenario: Block recreation for application errors
- **GIVEN** an instance with `tunnel_status: "error_response"` (e.g., HTTP 502)
- **WHEN** the recreate tunnel endpoint is called
- **THEN** the request is rejected with 400 Bad Request
- **AND** the error message explains the tunnel is working but the application is returning errors
## REMOVED Requirements
None.