Lifecycle hooks

Hooks are callbacks that run at specific points in the execution lifecycle. They let you react to outcomes (cancellation, success, failure) and perform cleanup without affecting the execution flow.

Hook types

KiCI supports six hook types at three levels (step, job, workflow):

Hook	When it runs	Available on
onCancel	After step/job/workflow is cancelled	Step, Job, Workflow
cleanup	Always (success, failure, or cancel)	Step, Job, Workflow
onSuccess	After job/workflow succeeds	Job, Workflow
onFailure	After job/workflow fails	Job, Workflow
beforeStep	Before each step in a job	Job
afterStep	After each step in a job	Job

Basic usage

Job-level hooks

import { workflow, job, step, push } from '@kici-dev/sdk';

export default workflow('deploy', {
  on: push({ branches: ['main'] }),
  jobs: [
    job('deploy-prod', {
      runsOn: 'linux',
      steps: [
        step('deploy', async ({ $ }) => {
          await $`kubectl apply -f manifests/`;
        }),
      ],
      onCancel: async (ctx) => {
        console.log(`Deploy cancelled: ${ctx.outcome.reason}`);
        await ctx.$`kubectl rollout undo deployment/app`;
      },
      cleanup: async (ctx) => {
        // Always runs -- release lock, notify team, etc.
        await ctx.$`curl -X POST https://slack.com/webhook -d '{"text": "Deploy ${ctx.outcome.status}"}'`;
      },
      onSuccess: async (ctx) => {
        console.log(`Deploy succeeded in ${ctx.outcome.duration}ms`);
      },
      onFailure: async (ctx) => {
        console.log(`Deploy failed at step: ${ctx.outcome.failedStep}`);
      },
      gracePeriod: 60, // 60 seconds before SIGKILL on cancel
    }),
  ],
});

Step-level hooks

step('download-artifacts', {
  run: async ({ $ }) => {
    await $`wget https://artifacts.example.com/build.tar.gz`;
  },
  onCancel: async (ctx) => {
    // Clean up partial downloads
    await ctx.$`rm -f build.tar.gz`;
  },
  cleanup: async (ctx) => {
    await ctx.$`rm -rf /tmp/staging`;
  },
});

Workflow-level hooks

workflow('ci', {
  on: push({ branches: ['main'] }),
  jobs: [
    /* ... */
  ],
  onCancel: async (ctx) => {
    // Notify when any job in the workflow is cancelled
    console.log('CI workflow cancelled');
  },
  cleanup: async (ctx) => {
    // Always runs after all jobs complete
    console.log(`CI workflow finished with status: ${ctx.outcome.status}`);
  },
});

Hook context

Hook functions receive the same StepContext as regular steps ($, ctx, log, env), plus an outcome object with metadata about the execution result.

ctx.outcome

interface OutcomeMetadata {
  /** Final status of the job/workflow. */
  status: 'cancelled' | 'success' | 'failed';
  /** Reason for cancellation (e.g., "User requested", "Superseded by run #42"). */
  reason?: string;
  /** Name of the step that caused failure (for onFailure hooks). */
  failedStep?: string;
  /** Outputs from all completed steps. */
  stepOutputs: Record<string, unknown>;
  /** Total execution duration in milliseconds. */
  duration: number;
}

Capabilities

Hooks can do everything regular steps can:

• Run shell commands via $
• Set environment variables via ctx.setEnv() and prepend to PATH via ctx.addPath()
• Access previous step outputs via ctx.outputsOf() and ctx.jobOutputs()
• Publish encrypted secret outputs via ctx.setSecretOutput()
• Log via log.info(), log.error(), etc.

Hook timeout

Each hook has a timeout (default: 5 minutes). You can customize it per-hook:

job('deploy', {
  runsOn: 'linux',
  steps: [
    /* ... */
  ],
  cleanup: {
    run: async (ctx) => {
      await ctx.$`./lengthy-cleanup.sh`;
    },
    timeout: 10 * 60 * 1000, // 10 minutes in ms
  },
});

Hook execution order

Hooks execute inside-out on cancellation (like stack unwinding):

1. Step-level cleanup (on the cancelled step)
2. Job-level onCancel, then cleanup
3. Workflow-level onCancel, then cleanup

On success: step afterStep (after each step), then job onSuccess + cleanup, then workflow onSuccess + cleanup.

On failure: job onFailure + cleanup, then workflow onFailure + cleanup.

cleanup always runs — regardless of whether the outcome was success, failure, or cancel.

Hooks are observers

Hooks follow the “one mechanism per concern” principle:

• Rules control whether a step/job executes (conditional logic)
• Hooks react to execution outcomes (lifecycle callbacks)

Hooks cannot short-circuit step execution or change the execution flow. They observe and respond.

beforeStep and afterStep

These job-level hooks run around every step in the job:

job('test', {
  runsOn: 'linux',
  beforeStep: async (ctx) => {
    console.log(`Starting step at ${new Date().toISOString()}`);
  },
  afterStep: async (ctx) => {
    console.log(`Step completed with status: ${ctx.outcome.status}`);
  },
  steps: [
    step('lint', async ({ $ }) => {
      await $`pnpm lint`;
    }),
    step('test', async ({ $ }) => {
      await $`pnpm test`;
    }),
  ],
});

afterStep runs immediately after its step, before the next step starts (not deferred to the end of the job).

Step-level rules

Step-level rules control whether a step executes, evaluated at runtime by the agent:

import { step, rule, skip, isEventType } from '@kici-dev/sdk';

step('deploy', {
  run: async ({ $ }) => {
    await $`kubectl apply -f manifests/`;
  },
  rules: [
    rule('only on main pushes', (ctx) => {
      if (!isEventType(ctx.event, 'push')) return false;
      return ctx.event.payload.ref === 'refs/heads/main';
    }),
  ],
});

// Or use skip() for explicit skip with a reason
step('optional-check', {
  run: async ({ $ }) => {
    await $`./optional-check.sh`;
  },
  rules: [skip('not needed in CI', () => true)],
});

When a rule returns false, the step is reported as skipped and subsequent steps continue normally. Skipped steps don’t cause the job to fail.

Step rules have access to runtime context via RuleContext: event (typed discriminated union), changedFiles, env, and $. They evaluate agent-side (unlike job-level rules which evaluate at the orchestrator during trigger matching).

Hook failure behavior

If a hook throws an error or times out:

• The job status changes to failed with a compound reason (e.g., “cancelled (onCancel hook failed: Connection timeout)”)
• Remaining hooks for that level are skipped
• The failure is visible in the dashboard as a failed hook step
• Force cancel kills running hooks immediately via SIGKILL

This behavior is consistent across all hook types.

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Source: packages/sdk/src/hooks/, packages/sdk/src/types.ts