---
title: "Atomically reserve a private task compute plan"
method: POST
path: "/api/v1/agent/persistent/scheduler/prepare_compute"
tags: ["agent"]
---

# Atomically reserve a private task compute plan

`POST /api/v1/agent/persistent/scheduler/prepare_compute`

## Request

- Base URL: `https://composal.com` (the document declares no server; this is the origin it was published from)
- URL: `https://composal.com/api/v1/agent/persistent/scheduler/prepare_compute`
- Auth: HTTP bearer

Trusted Activity only; original workflow attachment and current task authority required. Funding and immutable workspace/resource/price/expiry pins share one Git publication. Prepared identifies the first acknowledged preparation; uncertainty or expiry never permits repeated allocation. This port does not create a provider resource, issue provider credentials, settle usage or prove hard expiry. Return private data only inside trusted Activities, never Workflow payloads.

## Request body

- PersistentAgentComputePrepareRequest
  - `organization_id` string, required
  - `agent_id` string, required
  - `task_id` string, required
  - `first_execution_run_id` string, required
  - `scope` PersistentAgentWorkerScope, required
    - `task_id` string, required
    - `segment_id` string, required
    - `generation` integer, required
    - `claim_id` string, required
  - `operation_key` string, required
  - `machine_class` 'standard-2gb' | 'standard-4gb' | 'standard-8gb', required
  - `max_seconds` integer, required

## Response `200`

Immutable funded preparation or reconciliation metadata

- PersistentAgentComputePreparation
  - `state` 'prepared' | 'uncertain' | 'expired' | 'released', required
  - `plan` PersistentAgentComputePlan, required
    - `schema` 1, required
    - `id` string, required
    - `scope` PersistentAgentWorkerScope, required
      - `task_id` string, required
      - `segment_id` string, required
      - `generation` integer, required
      - `claim_id` string, required
    - `spec` PersistentAgentWorkspaceSpec, required
      - `task_id` string, required
      - `configuration_commit` string, required
      - `image` string, required: Explicit nonmoving provider image version; the trusted runtime independently verifies the applied image.
      - `setup_digest` string, required
      - `durable_paths` string[], required: Sorted relative regular-file paths; no overlaps, credentials or reserved paths.
    - `machine_class` string, required
    - `max_seconds` integer, required
    - `expires_at` string, date-time, required
    - `pricing` object, required
      - `provider` 'blaxel', required
      - `policy` 'persistent-compute-v1', required
      - `version` string, required
      - `memory_mb` integer, required
      - `cpu_millicores` integer, required
      - `gb_second_rate_usd` string, required
    - `resources` object, required
      - `tokens` integer, required
      - `compute_seconds` integer, required
      - `cost_microusd` integer, required
  - `version` string, required

## Other responses

- `401`: Invalid scheduler credential
- `403`: Current task authorization unavailable
- `404`: Task or organization unavailable
- `409`: Task scope, saved limits or prior allocation requires reconciliation
- `422`: Invalid selection or request
- `502`: Bad gateway
- `503`: Canonical state unavailable

---

[API](https://skmtc.dev/composal/apis/vex-api.md) - [All operations](https://skmtc.dev/composal/apis/vex-api/llms.txt) - [OpenAPI document](https://skmtc.dev/composal/apis/vex-api/revisions/74298a24e040?raw)