Template Variables Reference

Overcut uses Handlebars as its template engine. Templates appear in step params fields (especially repoFullName and branch in git.clone) and are resolved at runtime before each step executes.

Output Reference Syntax

Infrastructure Steps (git.clone, repo.identify)

Infrastructure steps produce structured output. Reference the entire output object:

code

{{outputs.step-id}}

Example — repo.identify output fed to git.clone:

json

{
  "repoFullName": "{{outputs.identify-repos}}"
}

The template engine auto-stringifies objects/arrays into readable JSON when printed directly, while preserving property access for nested fields.

Agent Steps (agent.run, agent.session)

Agent steps produce a message field containing the agent's text output:

code

{{outputs.step-id.message}}

Example — referencing previous agent output in a prompt:

markdown

**Previous step output:**

{{outputs.prep-context.message}}

This is how steps pass data to each other. The receiving step's instruction can include the template, and it gets resolved before the agent sees it.

Trigger Context Variables

All trigger context is available under {{trigger.*}}. The exact fields depend on the event type.

Common Fields (All Events)

code

{{trigger.repository.fullName}}     → "owner/repo"
{{trigger.repository.name}}         → "repo"
{{trigger.repository.owner}}        → "owner"
{{trigger.repository.defaultBranch}} → "main"
{{trigger.repository.provider}}     → "Github"
{{trigger.repository.description}}  → "Repo description"
{{trigger.repository.workspacePath}} → "/workspace/owner/repo"
{{trigger.repository.customInstructions}} → "Agent instructions for this repo"

{{trigger.actor.login}}             → "username"
{{trigger.actor.name}}              → "Display Name"
{{trigger.actor.email}}             → "user@example.com"
{{trigger.actor.type}}              → "User" | "Bot" | "Organization"

{{trigger.trigger.eventType}}       → "pull_request_opened"

Pull Request Events

code

{{trigger.pullRequest.number}}      → 42
{{trigger.pullRequest.title}}       → "Add feature X"
{{trigger.pullRequest.state}}       → "open" | "closed" | "merged"
{{trigger.pullRequest.baseBranch}}  → "main"
{{trigger.pullRequest.headBranch}}  → "feature/x"
{{trigger.pullRequest.author}}      → "username"
{{trigger.pullRequest.body}}        → "PR description"
{{trigger.pullRequest.draft}}       → true | false
{{trigger.pullRequest.labels}}      → ["bug", "priority:high"]
{{trigger.pullRequest.assignees}}   → ["user1", "user2"]
{{trigger.pullRequest.headSha}}     → "abc123..."
{{trigger.pullRequest.baseSha}}     → "def456..."
{{trigger.pullRequest.additions}}   → 150
{{trigger.pullRequest.deletions}}   → 30
{{trigger.pullRequest.changedFiles}} → 12
{{trigger.pullRequest.requestedReviewers}} → ["reviewer1"]
{{trigger.pullRequest.createdAt}}   → "2024-01-15T10:30:00Z"
{{trigger.pullRequest.updatedAt}}   → "2024-01-16T14:00:00Z"
{{trigger.pullRequest.mergeable}}   → true | false | null

Issue Events

code

{{trigger.issue.number}}            → 123
{{trigger.issue.title}}             → "Bug: X doesn't work"
{{trigger.issue.state}}             → "open" | "closed"
{{trigger.issue.labels}}            → ["bug", "high-priority"]
{{trigger.issue.assignees}}         → ["user1"]
{{trigger.issue.author}}            → "reporter"
{{trigger.issue.body}}              → "Issue description"
{{trigger.issue.workItemType}}      → "Bug" | "Task" | "Story"
{{trigger.issue.createdAt}}         → "2024-01-15T10:30:00Z"

Trigger-Specific Fields

code

{{trigger.trigger.label}}           → "security-vulnerability" (for label events)
{{trigger.trigger.labelAction}}     → "added" | "removed"
{{trigger.trigger.assignee}}        → "username" (for assign events)
{{trigger.trigger.slashCommand}}    → "review" (for manual triggers)
{{trigger.trigger.commentId}}       → "123456"
{{trigger.trigger.commentAuthor}}   → "username"
{{trigger.trigger.commentBody}}     → "Comment text"
{{trigger.trigger.commitAdded}}     → true (for PR edit with push)
{{trigger.trigger.reviewer}}        → "username" (for review events)
{{trigger.trigger.reviewState}}     → "approved" | "changes_requested"

Handlebars Helpers

The template engine registers these helpers:

Comparison Helpers

handlebars

{{#if (eq variable "value")}}...{{/if}}
{{#if (neq variable "value")}}...{{/if}}
{{#if (gt count 5)}}...{{/if}}
{{#if (gte count 5)}}...{{/if}}
{{#if (lt count 5)}}...{{/if}}
{{#if (lte count 5)}}...{{/if}}

Logical Helpers

handlebars

{{#if (and condition1 condition2)}}...{{/if}}
{{#if (or condition1 condition2)}}...{{/if}}
{{#if (not condition)}}...{{/if}}

Serialization Helper

handlebars

{{json someObject}}

Outputs the object as pretty-printed JSON. Useful for debugging or passing structured data.

Iteration

handlebars

{{#each items}}
  {{this.name}} - {{this.value}}
{{/each}}

Usage Locations

Templates are primarily used in:

•Step params — repoFullName, branch in git.clone
•Step instructions — Reference previous step outputs in agent prompts

Templates are not used in trigger conditions (those use the condition engine with operators).

For the complete field listing of all context types, see references/trigger-context-fields.md.