nullTickets

Headless task tracker for autonomous AI agents.

nullTickets is a single Zig binary backed by SQLite. It exposes a REST API for pipeline-driven task tracking and execution coordination: claim work by role, report progress, transition stages, and attach artifacts.

Why

• Keep agents running without manual nudging.
• Track long-running autonomous work with durable state.
• Enforce lease-based execution and safe retries.

Design Principles

nullTickets should be treated as the task tracker and source of truth for AI-agent execution.

• nullTickets (this repository) is responsible for durable task state:
  • pipelines, stages, transitions
  • runs, leases, events, artifacts
  • dependencies, quality gates, assignments
  • idempotent writes and optimistic transition checks
• nullTickets is intentionally orchestration-light:
  • it does not decide global scheduling strategy
  • it does not run agent processes itself
• nullboiler is the orchestrator layer:
  • repository: nullboiler
  • plans execution, selects agents, balances queues, applies policies, and drives transitions
• nullclaw is the agent runtime/executor layer:
  • repository: nullclaw
  • executes role prompts, produces outputs, reports back through tracker APIs

Practical architecture:

1. nullTickets stores the work graph and execution history.
2. nullboiler orchestrates who should do what and when.
3. nullclaw agents do the actual work and publish evidence/results.

You do not have to use all three components.

• nullclaw + nullTickets is a valid setup for sequential execution.
• nullTickets can be used with other agent runtimes as long as they implement the tracker contract (claim -> events/gates -> transition/fail).
• nullboiler is optional and is mainly needed for advanced multi-agent orchestration.

Adoption Path

1. Use nullclaw only for one-off tasks.
2. Add nullTickets when you need a durable backlog (for example 100 tasks) and sequential execution with one agent loop.
3. Add nullboiler when you need multi-agent scheduling, balancing, and policy automation.

Tech Stack

• Zig 0.15.2
• SQLite (vendored, static dependency)
• JSON over HTTP/1.1

Quick Start

zig build
zig build run -- --port 7700 --db tracker.db

Default values:

• --port: 7700
• --db: nulltickets.db

Test

zig build test
bash tests/test_e2e.sh

Project Layout

• src/main.zig - process entrypoint, argument parsing, socket accept loop
• src/api.zig - HTTP routing, request validation, response serialization
• src/store.zig - SQLite queries, transactions, ownership/free helpers
• src/domain.zig - pipeline FSM parsing and validation
• src/ids.zig - UUID/token/hash/time helpers
• src/migrations/001_init.sql - database schema
• tests/test_e2e.sh - end-to-end API flow

API Surface

Method	Path	Description
GET	/openapi.json	Full OpenAPI 3.1 schema for agent integration
GET	/.well-known/openapi.json	Well-known OpenAPI discovery endpoint
POST	/v1/traces	OTLP traces ingest (application/json or application/x-protobuf)
POST	/otlp/v1/traces	OTLP collector-compatible traces ingest path
GET	/health	Service and queue health
POST	/pipelines	Create pipeline definition
GET	/pipelines	List pipelines
GET	/pipelines/{id}	Get pipeline by id
POST	/tasks	Create task
POST	/tasks/bulk	Bulk create tasks
GET	/tasks?stage=&pipeline_id=&limit=&cursor=	List tasks (cursor paginated)
GET	/tasks/{id}	Get task details
POST	/tasks/{id}/dependencies	Add dependency
GET	/tasks/{id}/dependencies	List dependencies
POST	/tasks/{id}/assignments	Assign task to agent
GET	/tasks/{id}/assignments	List assignments
DELETE	/tasks/{id}/assignments/{agent_id}	Unassign task
POST	/leases/claim	Claim next task by role
POST	/leases/{id}/heartbeat	Extend lease
POST	/runs/{id}/events	Append run event
GET	/runs/{id}/events?limit=&cursor=	List run events (cursor paginated)
POST	/runs/{id}/gates	Add quality gate result
GET	/runs/{id}/gates	List quality gate results
POST	/runs/{id}/transition	Move task to next stage
POST	/runs/{id}/fail	Mark run as failed
POST	/artifacts	Attach artifact
GET	/artifacts?task_id=&run_id=&limit=&cursor=	List artifacts (cursor paginated)
GET	/ops/queue	Per-role queue stats for orchestrator

Agent Loop

POST /leases/claim { agent_id, agent_role, lease_ttl_ms? }
-> 200 { task, run, lease_id, lease_token, expires_at_ms }
-> 204 (no work)

POST /runs/{run_id}/events      (Bearer <lease_token>)
POST /runs/{run_id}/gates       (Bearer <lease_token>)
POST /runs/{run_id}/transition  (Bearer <lease_token>)
POST /runs/{run_id}/fail        (Bearer <lease_token>)

GET /tasks?limit=&cursor=
GET /runs/{run_id}/events?limit=&cursor=
GET /artifacts?limit=&cursor=

For practical nullclaw integration patterns (single-agent first, multi-agent optional), see nullclaw.md.

Documentation

• Docs Index
• Architecture
• API Reference
• Workflows
• Agent Lifecycle

Agent bootstrap endpoint:

• GET /openapi.json

OpenTelemetry

nullTickets accepts OTLP traces on:

• POST /v1/traces
• POST /otlp/v1/traces

Behavior:

• application/json: parses OTLP ExportTraceServiceRequest and stores normalized spans in otlp_spans.
• Non-JSON payloads (for example application/x-protobuf): stores raw payload in otlp_batches.payload_blob.

To link telemetry to tracker entities, include span/resource attributes:

• nulltickets.run_id
• nulltickets.task_id