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How it works

Describe, plan, apply, govern.

People set goals, policy and budgets, then answer the rare exception. Agents do the rest through the same API, and every change is planned and priced before it runs.

Four steps

  1. 01

    Describe the fleet

    Write a short manifest, or let an agent write it: which harness to run, the goal, the schedule, which tools it may use and the budget.

  2. 02

    Plan and quote

    Every change is a plan first. The plan shows the diff, the effect classes involved, which approvals it needs and a price quote, before anything runs.

  3. 03

    Apply

    Apply the plan. Heighliner starts a sandbox per agent, mounts short-lived credentials and routes model and tool calls through the gateway, which spends from the budget.

  4. 04

    Govern

    Risky actions wait for you in Slack, ChatGPT, Claude or the console. Everything else runs within policy. Read the receipt when the run ends.

The manifest

Budget, permissions and escalation are fields, not afterthoughts.

A fleet is described in one short file: the harness, the goal, the triggers, which tools it may use and which need approval, and the budget. Your model key is a reference to a secret, never the value.

hl plan shows the diff, the approvals it needs and a quote. hl apply runs exactly the plan you saw; if anything changed in between, you get a fresh plan instead.

fleet.yaml
fleet: seo-weekly
runtime: claude-code       # or codex, hermes, opencode
goal: "Find and fix SEO issues on example.com"
model: { provider: openrouter, key: secret://OPENROUTER_KEY }
triggers:
  - schedule: "0 6 * * 1"  # Mondays 06:00
  - slack: "#growth"
tools:
  github: { allow: [pulls.create], require_approval: [pulls.merge] }
budget: { monthly_usd: 30, per_run_usd: 0.50 }
terminal
$ hl plan fleet.yaml
  + fleet seo-weekly    runtime claude-code
  ~ budget              $30.00/mo, $0.50/run
  ! approval            pulls.merge
  quote                 ~$0.31/run + your tokens
  plan pln_7f2c expires in 15 min

$ hl apply pln_7f2c
  applied pln_7f2c  fleet seo-weekly is scheduled

One run, end to end

Cheap to pause, safe to crash, hard to overspend.

  1. queued

    A schedule, Slack message, webhook, API call or chat starts a run. The budget is checked before anything starts.

  2. running

    The agent runs in its own sandbox. Model and tool calls go through the gateway, which attaches your key outside the sandbox and spends from a budget lease.

  3. awaiting approval

    An irreversible action is held in escrow. The agent waits without burning compute until someone approves or rejects it.

  4. completed

    Escrowed effects are released on commit, and the run ends with a receipt: agent, model, policy version, checks and the trace.

If the budget runs out mid-run, no new lease is granted and the call returns budget_exhausted with a fix. Read more about budget leases, effect classes and escrow.

Early access

Give your agents a budget, a sandbox and a supervisor.

Heighliner is in early access. Join the waitlist and we will reach out as places open.

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