rollback
Revert to a previous checkpoint version to correct errors from merges or restore earlier project states.
Instructions
Revert to a previous checkpoint version. Useful if a merge produced incorrect results.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| steps | No | Number of versions to roll back (default: 1) |
Implementation Reference
- src/core/ProjectBrain.ts:291-327 (handler)Core handler function that performs the rollback by retrieving checkpoint history from Redis and restoring a previous project state.
async rollback(steps: number = 1): Promise<string> { const sessionId = this.ensureInitialized(); try { logger.info('Rolling back checkpoint', { sessionId, steps }); const history = await this.redis.getCheckpointHistory(sessionId); if (history.length === 0) { return 'No checkpoint history available to rollback.'; } if (steps > history.length) { return `Only ${history.length} checkpoints available. Cannot rollback ${steps} steps.`; } // Get the target checkpoint (index is steps because history[0] is current) const targetCheckpoint = history[steps]; // Restore the state await this.redis.updateStateWithLock(sessionId, async () => { return targetCheckpoint.state; }); logger.info('Rollback completed', { targetVersion: targetCheckpoint.version, targetTimestamp: targetCheckpoint.timestamp, }); return `Rolled back to version ${targetCheckpoint.version} (${new Date( targetCheckpoint.timestamp ).toLocaleString()})`; } catch (error) { logger.error('Rollback failed', { error, sessionId }); throw new Error(`Rollback failed: ${error}`); } } - src/types/schema.ts:100-104 (schema)Zod schema for validating the rollback tool input (number of steps to rollback).
export const RollbackInputSchema = z.object({ steps: z.number().int().positive().default(1), }); export type CheckpointInput = z.infer<typeof CheckpointInputSchema>; - src/index.ts:86-99 (registration)Tool registration in the listTools handler, defining name, description, and input schema for MCP discovery.
name: 'rollback', description: 'Revert to a previous checkpoint version. Useful if a merge produced incorrect results.', inputSchema: { type: 'object', properties: { steps: { type: 'number', description: 'Number of versions to roll back (default: 1)', default: 1, }, }, }, }, - src/index.ts:144-150 (handler)MCP tool call dispatcher case that parses input schema and delegates to ProjectBrain.rollback.
case 'rollback': { const input = RollbackInputSchema.parse(args || {}); const result = await this.brain.rollback(input.steps); return { content: [{ type: 'text', text: result }], }; }