Playbook Lanes Guide

Practical guide for configuring playbook lanes — covers restart rules, conditional execution, start delays, and common lane layouts. For the underlying type signatures see playbook-api; for execution-ordering concepts see playbook-guide.

When to Use

• You need to configure whether a lane re-runs when the playbook is restarted (restartRule)
• You need to skip a lane conditionally at runtime based on a data pill (conditionToRun)
• You need to delay a lane's start after its dependencies complete (startWithDelay)
• You need a layout reference for sequential, parallel, or conditional lane structures

Restart Rules

Every lane declares a restartRule that controls behavior when a playbook is restarted.

Rule	Behavior
'RUN_ONLY_ONCE'	Lane runs on the first execution only; skipped on restart
'RUN_ALWAYS'	Lane runs on every execution, including restarts
'RUN_ONLY_ON_RESTART'	Lane is skipped on the first execution; runs only when the playbook is restarted

Use 'RUN_ONLY_ONCE' for setup or intake lanes that should not repeat. Use 'RUN_ALWAYS' for resolution lanes that should re-evaluate state on restart. Use 'RUN_ONLY_ON_RESTART' for cleanup or recovery lanes that only make sense after a prior run.

Conditional Execution

Use conditionToRun to skip a lane at runtime based on a condition. The condition uses ServiceNow encoded query format; interpolate data pills with wfa.playbook.dataPill() and the helper handles formatting for you.

// Assumes the playbook declares a boolean input called `skipEnrichment`
const enrichment = wfa.playbook.lane({
    config: {
        $id: Now.ID['lane_enrichment'],
        label: 'Enrichment',
        order: 2,
        startRule: wfa.playbook.run.After(intake),
        restartRule: 'RUN_ALWAYS',
        conditionToRun: `${wfa.playbook.dataPill(params.inputs.skipEnrichment)}=false`,
    },
    activities: () => ({}),
})

Allowed pill sources in conditionToRun:

• params.inputs.* — playbook inputs
• params.parentRecord.* — the triggering record's fields
• Activity outputs from a lane that runs before this one
• Activity state from a lane that runs before this one

Not allowed in conditions: params.state, activity sysId, and wfa.playbook.currentActivity.* — the pill resolver emits a diagnostic error if you use any of these in a conditionToRun (or any other condition field).

Operators: Use encoded query syntax — = equals, != not equals, STARTSWITH, ENDSWITH, LIKE, ISEMPTY, ISNOTEMPTY, ^ AND, ^OR OR.

For conditional routing within a lane (rather than skipping the lane entirely), prefer a Decision activity. Use conditionToRun only when the whole lane should be skipped.

Start With Delay

startWithDelay delays a lane's start after its startRule is satisfied. Three delay types are supported, discriminated by type.

Explicit duration

Fixed delay specified as any combination of days, hours, minutes, and seconds:

const followup = wfa.playbook.lane({
    config: {
        $id: Now.ID['lane_followup'],
        label: 'Follow-Up',
        order: 2,
        startRule: wfa.playbook.run.After(intake),
        restartRule: 'RUN_ONLY_ONCE',
        startWithDelay: {
            type: 'explicit',
            duration: { days: 4, hours: 3, minutes: 2, seconds: 1 },
        },
    },
    activities: () => ({}),
})

duration accepts a data pill in addition to the literal { days, hours, minutes, seconds } object.

Relative duration

Delay relative to a datetime, before or after. Both duration and relativeDatetime accept data pills as well as literal values.

startWithDelay: {
    type: 'relative',
    duration: { days: 5, hours: 4 },
    relativeDatetime: '2026-03-20 22:13:31',
    relativeOperator: 'after',
}

relativeOperator is 'before' or 'after'.

Percentage duration

Delay as a percentage of time relative to a datetime:

startWithDelay: {
    type: 'percentage',
    percentage: 50,
    percentageDatetime: '2026-03-20 22:13:57',
}

percentage is greater than 0 and up to 100; decimals like 10.5 are allowed. Both percentage and percentageDatetime accept data pills as well as literals.

When to use which

• Use explicit for fixed offsets ("start 1 hour after the previous lane completes").
• Use relative when the offset is computed against a known datetime, optionally from a data pill.
• Use percentage for SLA-style timing ("start when 50% of the SLA window has elapsed").

Prefer startWithDelay over inserting a timer activity as the first step of a lane — the platform handles the delay natively and the intent is clearer in the lane configuration.

Common Lane Layouts

Single lane — runs immediately

lanes: () => {
    const intake = wfa.playbook.lane({
        config: {
            $id: Now.ID['lane_intake'],
            label: 'Intake',
            order: 1,
            startRule: wfa.playbook.run.Immediately(),
            restartRule: 'RUN_ONLY_ONCE',
        },
        activities: () => ({}),
    })
    return { intake: intake }
}

Sequential lanes — each waits for the previous

lanes: () => {
    const triage = wfa.playbook.lane({
        config: {
            $id: Now.ID['lane_triage'],
            label: 'Triage',
            order: 1,
            startRule: wfa.playbook.run.Immediately(),
            restartRule: 'RUN_ONLY_ONCE',
        },
        activities: () => ({}),
    })
    const resolution = wfa.playbook.lane({
        config: {
            $id: Now.ID['lane_resolution'],
            label: 'Resolution',
            order: 2,
            startRule: wfa.playbook.run.After(triage),
            restartRule: 'RUN_ALWAYS',
        },
        activities: () => ({}),
    })
    return { triage: triage, resolution: resolution }
}

Convergence — one lane waits for two parallel lanes

lanes: () => {
    const team_a = wfa.playbook.lane({
        config: {
            $id: Now.ID['lane_team_a'],
            label: 'Team A',
            order: 1,
            startRule: wfa.playbook.run.Immediately(),
            restartRule: 'RUN_ONLY_ONCE',
        },
        activities: () => ({}),
    })
    const team_b = wfa.playbook.lane({
        config: {
            $id: Now.ID['lane_team_b'],
            label: 'Team B',
            order: 2,
            startRule: wfa.playbook.run.Immediately(),
            restartRule: 'RUN_ONLY_ONCE',
        },
        activities: () => ({}),
    })
    const merge = wfa.playbook.lane({
        config: {
            $id: Now.ID['lane_merge'],
            label: 'Merge Results',
            order: 3,
            startRule: wfa.playbook.run.After(team_a, team_b),
            restartRule: 'RUN_ONLY_ONCE',
        },
        activities: () => ({}),
    })
    return { team_a: team_a, team_b: team_b, merge: merge }
}

wfa.playbook.run.After(team_a, team_b) accepts varargs — the merge lane waits for both dependencies to complete.

Conditional lane with delay

lanes: (params) => {
    const intake = wfa.playbook.lane({
        config: {
            $id: Now.ID['lane_intake'],
            label: 'Intake',
            order: 1,
            startRule: wfa.playbook.run.Immediately(),
            restartRule: 'RUN_ONLY_ONCE',
        },
        activities: () => ({}),
    })
    const triage = wfa.playbook.lane({
        config: {
            $id: Now.ID['lane_triage'],
            label: 'Triage',
            order: 2,
            startRule: wfa.playbook.run.After(intake),
            restartRule: 'RUN_ALWAYS',
            conditionToRun: `${wfa.playbook.dataPill(params.inputs.skipEnrichment)}=false`,
            startWithDelay: {
                type: 'explicit',
                duration: { hours: 1 },
            },
        },
        activities: () => ({}),
    })
    return { intake: intake, triage: triage }
}

Best Practices

1. Declare lanes in dependency order. A lane must be assigned to a const before another lane can reference it in wfa.playbook.run.After(). TypeScript will catch out-of-order references as "variable used before declaration."
2. Always return every lane variable. Each const lane must appear in the object returned by the lanes function — otherwise the lane is not registered.
3. Use order for visual layout only. order controls display position in the designer; startRule controls execution order. They are independent.
4. At least one lane should start with wfa.playbook.run.Immediately(). Otherwise nothing will run.
5. Use conditionToRun only to skip the whole lane. For conditional routing inside a lane, use a Decision activity.
6. Prefer startWithDelay over a leading timer activity. When the intent is "delay this lane's start," express it in the lane config rather than as a step.
7. Use descriptive lane labels. Labels appear in the playbook UI and in restart prompts.

Important Notes

• A lane with wfa.playbook.run.After(a, b) waits for all listed dependencies to complete.
• The activities callback must return an object. Use () => ({}) for an empty lane.
• Cross-lane data references use the lane variable: intake.enrich.outputs.support_tier. Cross-lane activity references in an activity's startRule are not supported — use a lane-level dependency instead. See playbook-guide for the full explanation.