> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.islo.dev/api-reference/jobs/validate-job-manifest/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.islo.dev/_mcp/server.

# Validate job manifest without deploying

POST https://api.islo.dev/jobs/{name}/validate
Content-Type: application/json

Reference: https://docs.islo.dev/api-reference/jobs/validate-job-manifest

## Authentication

- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Request

### Path parameters

- `name` (string, required)

### Body (application/json)

This endpoint expects a JobDeployRequest.

- `manifest` (JobManifest-Input, required) — Job manifest (authored as TOML or JSON, stored as JSON)

## Response

### 204

Successful Response

## Errors

### 401 Unauthorized Error

Unauthorized

- `code` (enum, required)
  - Allowed values: `AUTH_REQUIRED`, `INVALID_REQUEST`, `NOT_FOUND`, `VALIDATION_ERROR`, `SANDBOX_NOT_FOUND`, `SANDBOX_ALREADY_EXISTS`, `SANDBOX_INVALID_STATE`, `SANDBOX_PROVISIONING_FAILED`, `RESOURCE_NOT_FOUND`, `FILE_NOT_FOUND`, `COMMAND_NOT_FOUND`, `EXEC_FAILED`, `FILE_OPERATION_ERROR`, `RESOURCE_UNAVAILABLE`, `ACCESS_DENIED`, `CACHE_CONFLICT`, `BILLING_NOT_ALLOWED`, `TENANT_SUSPENDED`, `RATE_LIMITED`, `TIMEOUT`, `GONE`, `BAD_GATEWAY`, `INTERNAL_ERROR`
- `message` (string, required)
- `available` (long, optional, nullable)
- `limit` (long, optional, nullable)
- `request_id` (string, optional, nullable)
- `requested` (long, optional, nullable)
- `resource` (string, optional, nullable) — Optional capacity fields populated for `InsufficientResources` errors so clients (including peer agents) can recover the typed payload across HTTP boundaries instead of collapsing it to an opaque message.

### 422 Unprocessable Entity Error

Unprocessable Content

- `code` (enum, required)
  - Allowed values: `AUTH_REQUIRED`, `INVALID_REQUEST`, `NOT_FOUND`, `VALIDATION_ERROR`, `SANDBOX_NOT_FOUND`, `SANDBOX_ALREADY_EXISTS`, `SANDBOX_INVALID_STATE`, `SANDBOX_PROVISIONING_FAILED`, `RESOURCE_NOT_FOUND`, `FILE_NOT_FOUND`, `COMMAND_NOT_FOUND`, `EXEC_FAILED`, `FILE_OPERATION_ERROR`, `RESOURCE_UNAVAILABLE`, `ACCESS_DENIED`, `CACHE_CONFLICT`, `BILLING_NOT_ALLOWED`, `TENANT_SUSPENDED`, `RATE_LIMITED`, `TIMEOUT`, `GONE`, `BAD_GATEWAY`, `INTERNAL_ERROR`
- `message` (string, required)
- `available` (long, optional, nullable)
- `limit` (long, optional, nullable)
- `request_id` (string, optional, nullable)
- `requested` (long, optional, nullable)
- `resource` (string, optional, nullable) — Optional capacity fields populated for `InsufficientResources` errors so clients (including peer agents) can recover the typed payload across HTTP boundaries instead of collapsing it to an opaque message.

## Types

### JobManifest-Input

Full job.toml manifest (TOML or JSON authoring; stored as JSON).

- `job` (JobSection, required)
- `run` (RunSection-Input, required)
- `schedule` (ScheduleSection, optional, nullable)
- `verification` (VerificationSection, optional, nullable)
- `outputs` (map from string to JobOutputSpec, optional, nullable) — Public job output contract for the job and downstream lines.

### JobSection

- `name` (string, required) — Job name; must match jobs/\<name>/ and deploy path
- `version` (string, optional, nullable)
- `description` (string, optional, nullable)
- `params` (map from string to JobParamSpec, optional, nullable) — Declared run parameters. Reference as \{\{name}} in manifest strings (substitution and undeclared-reference checks walk the whole manifest, not only step fields). Reserved: \{\{run\_id}}.

### RunSection-Input

- `tasks` (list of Task-Input, required)
- `fail_fast` (boolean, optional, default: true)
- `fanout` (boolean, optional, default: false)
- `concurrency` (integer, optional, default: 1)
- `workdir` (string, optional, nullable) — Working directory for every exec and run_agent step. Defaults to ".". Falls back to run.sandbox.workdir when omitted.
- `timeout` (RunSectionInputTimeout, optional, nullable)
- `region` (string, optional, nullable)
- `teardown_on_complete` (boolean, optional, nullable)
- `resume_on_start` (boolean, optional, nullable)
- `sandbox` (SandboxConfig, optional, nullable) — Sandbox requirements for job runs (matches compute IncomingWebhookSandboxTemplate shape).

### ScheduleSection

- `cron` (string, required) — Cron expression; validated at deploy time. Every param the schedule uses must have a default before you add [schedule].
- `timezone` (string, optional, default: UTC)
- `enabled` (boolean, optional, default: true)

### VerificationSection

- `enabled` (boolean, optional, default: false)
- `gate` (VerificationGate, optional, nullable)

### JobOutputSpec

Public job output contract. Writers emit the producer type; lines bind the published type after reduce. Session agents and $ISLO_OUTPUT use producer types (collect/gather still send the producer type, not the published array).

- `type` (enum, required)
  - Allowed values: `string`, `integer`, `number`, `boolean`, `array`
- `items` (enum, optional, nullable) — Item type for array outputs. Required at deploy when type = array. Do not use reduce = collect with type = array; use gather to concatenate arrays.
  - Allowed values: `string`, `integer`, `number`, `boolean`
- `required` (boolean, optional, default: true)
- `description` (string, optional, nullable)
- `enum` (list of any, optional, nullable)
- `reduce` (enum, optional, default: one) — one: exactly one claiming step. last: last successful write in manifest task order. collect: published array of producer values (dense nulls for missing tasks); required collect must be claimed by every task. gather: concatenate arrays or collect scalars, skipping omissions.
  - Allowed values: `one`, `last`, `collect`, `gather`

### JobParamSpec

- `type` (JobParamSpecType, required)
- `items` (enum, optional, nullable) — Item type when type = array.
  - Allowed values: `string`, `integer`, `number`, `boolean`
- `required` (boolean, optional, default: false) — Cannot combine required=true with a default.
- `description` (string, optional, nullable)
- `pattern` (string, optional, nullable)
- `prefix` (string, optional, nullable)
- `enum` (list of any, optional, nullable)

### Task-Input

- `name` (string, required)
- `steps` (list of TaskStep-Input, required)
- `sandbox` (SandboxConfig, optional, nullable) — Sandbox requirements for job runs (matches compute IncomingWebhookSandboxTemplate shape).

### RunSectionInputTimeout

### SandboxConfig

Sandbox requirements for job runs (matches compute IncomingWebhookSandboxTemplate shape).

- `mode` (enum, optional, default: provision)
  - Allowed values: `provision`, `ensure`, `reuse`
- `name` (string, optional, nullable) — Required for ensure/reuse. Supports \{\{param}} substitution.
- `image` (string, optional, nullable) — Required for provision/ensure.
- `vcpus` (integer, optional, default: 2)
- `memory_mb` (integer, optional, default: 2048)
- `disk_gb` (integer, optional, default: 10)
- `snapshot_name` (string, optional, nullable)
- `gateway_profile` (string, optional, nullable)
- `environment` (string, optional, nullable)
- `init` (SandboxConfigInit, optional, nullable)
- `internet_enabled` (boolean, optional, default: true)
- `workdir` (string, optional, nullable) — Sandbox default working directory. Used when [run].workdir is omitted.
- `cache_key` (string, optional, nullable)
- `env` (map from string to string, optional, nullable)
- `sources` (list of GitSource, optional, nullable)
- `setup_scripts` (list of SetupScript, optional, nullable)
- `lifecycle` (LifecyclePolicy, optional, nullable)

### VerificationGate

- `compare_to` (string, optional, nullable)
- `min_pass_rate` (double, optional, nullable)

### JobParamSpecType

### TaskStep-Input

One compute action per step. Define exactly one action key (exec, run_agent, snapshot, pause, resume, or delete). Task names and step names must be unique and non-blank. A job with [outputs], exactly one session run_agent step, and no step listing outputs implicitly claims every output key. More than one potential writer, or any explicit outputs list, requires every writer to claim.

- `name` (string, optional, nullable) — Unique non-blank step name within the task.
- `workdir` (string, optional, nullable) — Override \[run].workdir for this step. Supports \{\{name}} placeholders.
- `timeout` (integer, optional, nullable) — Max wall-clock duration for this step in seconds.
- `user` (string, optional, nullable)
- `exec` (TaskStepInputExec, optional, nullable) — Shell command. Supports \{\{name}} placeholders in each argv element. Control plane sets \$ISLO\_OUTPUT to /dev/null when the step claims no output keys, or /tmp/islo\_output.\<job\_run\_id>.\<random> when it claims keys. Write key=value lines (JSON after =, raw string fallback for type=string). Do not pre-create the file. Cap is 64 KiB.
- `run_agent` (TaskStepInputRunAgent, optional, nullable) — Run an agent step. Session mode publishes claimed producer keys as structured JSON. Exec mode uses $ISLO_OUTPUT like exec.
- `snapshot` (SnapshotStepAction, optional, nullable)
- `pause` (boolean, optional, nullable)
- `resume` (boolean, optional, nullable)
- `delete` (boolean, optional, nullable)
- `upload` (string, optional, nullable) — Not implemented yet; do not author.
- `download` (string, optional, nullable) — Not implemented yet; do not author.
- `outputs` (TaskStepInputOutputs, optional, nullable) — Claim job output keys. List shortcut: outputs = ["summary"]. Table: [run.tasks.steps.outputs.summary] from = "agent_key", required = true.

### SandboxConfigInit

- `type`: `custom` (SandboxInitCustom)
  - `await_ready` (boolean, optional, default: false)
  - `capabilities` (list of enum, optional)
    - Allowed values: `ssh`, `docker`
- `type`: `full` (SandboxInitFull)
- `type`: `minimal` (SandboxInitMinimal)

### GitSource

A git source to clone into /workspace.

- `repo_url` (string, required)
- `branch` (string, optional, nullable)
- `target_path` (string, optional, nullable)

### SetupScript

A named setup script to execute after git clones.

- `script` (string, required)
- `name` (string, optional)

### LifecyclePolicy

- `auto_resume` (enum, optional)
  - Allowed values: `never`, `on_activity`
- `delete_after` (long, optional, nullable)
- `pause_after` (long, optional, nullable)
- `pause_after_idle` (long, optional, nullable)

### TaskStepInputExec

Shell command. Supports \{\{name}} placeholders in each argv element. Control plane sets \$ISLO\_OUTPUT to /dev/null when the step claims no output keys, or /tmp/islo\_output.\<job\_run\_id>.\<random> when it claims keys. Write key=value lines (JSON after =, raw string fallback for type=string). Do not pre-create the file. Cap is 64 KiB.

### TaskStepInputRunAgent

Run an agent step. Session mode publishes claimed producer keys as structured JSON. Exec mode uses $ISLO_OUTPUT like exec.

- `mode`: `exec` (RunAgentExecStepAction)
  - `command` (TaskStepOutputRunAgentDiscriminatorMappingExecCommand, required)
  - `harness` (enum, required)
    - Allowed values: `codex`, `cursor`, `claude`, `opencode`, `custom`
  - `model` (string, optional, nullable)
- `mode`: `session` (RunAgentSessionStepAction)
  - `harness` (enum, required) — Session outputs require claude, codex, cursor, or opencode.
    - Allowed values: `codex`, `cursor`, `claude`, `opencode`
  - `command` (TaskStepOutputRunAgentDiscriminatorMappingSessionCommand, optional, nullable)
  - `effort` (string, optional, nullable) — Reasoning effort token. Requires model. Legal values come from the effort table on GET /inference/models, which is keyed by harness and optionally by model. For cursor the pair also resolves to a real model id, because cursor encodes effort in the id rather than taking a flag. Omit to use the harness default.
  - `knowledge` (list of KnowledgeBinding, optional, nullable)
  - `mcp` (list of McpEntry, optional, nullable) — MCP server descriptors to make available to the agent. Each entry carries a key (unique label) and url (MCP endpoint). Duplicates by key are rejected.
  - `model` (string, optional, nullable)
  - `model_provider` (enum, optional, nullable)
    - Allowed values: `islo`, `islo_inference`
  - `prompt` (TaskStepOutputRunAgentDiscriminatorMappingSessionPrompt, optional, nullable)
  - `resume_prompt` (TaskStepOutputRunAgentDiscriminatorMappingSessionResumePrompt, optional, nullable)
  - `session` (string, optional, nullable)

### SnapshotStepAction

- `name` (string, required)

### TaskStepInputOutputs

Claim job output keys. List shortcut: outputs = ["summary"]. Table: [run.tasks.steps.outputs.summary] from = "agent_key", required = true.

### TaskStepOutputRunAgentDiscriminatorMappingExecCommand

### TaskStepOutputRunAgentDiscriminatorMappingSessionCommand

### KnowledgeBinding

- `slug` (string, required)

### McpEntry

One MCP server descriptor in a run_agent step.

- `key` (string, required)
- `url` (string, required)

### TaskStepOutputRunAgentDiscriminatorMappingSessionPrompt

- `type`: `knowledge` (KnowledgeBinding)
  - `slug` (string, required)
- `type`: `literal` (LiteralBinding)
  - `value` (any, required)

### TaskStepOutputRunAgentDiscriminatorMappingSessionResumePrompt

- `type`: `knowledge` (KnowledgeBinding)
  - `slug` (string, required)
- `type`: `literal` (LiteralBinding)
  - `value` (any, required)

## Examples

**Request**

```json
{
  "manifest": {
    "job": {
      "name": "string"
    },
    "run": {
      "tasks": [
        {
          "name": "string",
          "steps": [
            {}
          ]
        }
      ]
    }
  }
}
```

**SDK Code**

```python
import requests

url = "https://api.islo.dev/jobs/name/validate"

payload = { "manifest": {
        "job": { "name": "string" },
        "run": { "tasks": [
                {
                    "name": "string",
                    "steps": [{}]
                }
            ] }
    } }
headers = {
    "Authorization": "Bearer <api_key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://api.islo.dev/jobs/name/validate';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <api_key>', 'Content-Type': 'application/json'},
  body: '{"manifest":{"job":{"name":"string"},"run":{"tasks":[{"name":"string","steps":[{}]}]}}}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.islo.dev/jobs/name/validate"

	payload := strings.NewReader("{\n  \"manifest\": {\n    \"job\": {\n      \"name\": \"string\"\n    },\n    \"run\": {\n      \"tasks\": [\n        {\n          \"name\": \"string\",\n          \"steps\": [\n            {}\n          ]\n        }\n      ]\n    }\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <api_key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.islo.dev/jobs/name/validate")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <api_key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"manifest\": {\n    \"job\": {\n      \"name\": \"string\"\n    },\n    \"run\": {\n      \"tasks\": [\n        {\n          \"name\": \"string\",\n          \"steps\": [\n            {}\n          ]\n        }\n      ]\n    }\n  }\n}"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.islo.dev/jobs/name/validate")
  .header("Authorization", "Bearer <api_key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"manifest\": {\n    \"job\": {\n      \"name\": \"string\"\n    },\n    \"run\": {\n      \"tasks\": [\n        {\n          \"name\": \"string\",\n          \"steps\": [\n            {}\n          ]\n        }\n      ]\n    }\n  }\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.islo.dev/jobs/name/validate', [
  'body' => '{
  "manifest": {
    "job": {
      "name": "string"
    },
    "run": {
      "tasks": [
        {
          "name": "string",
          "steps": [
            {}
          ]
        }
      ]
    }
  }
}',
  'headers' => [
    'Authorization' => 'Bearer <api_key>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.islo.dev/jobs/name/validate");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <api_key>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"manifest\": {\n    \"job\": {\n      \"name\": \"string\"\n    },\n    \"run\": {\n      \"tasks\": [\n        {\n          \"name\": \"string\",\n          \"steps\": [\n            {}\n          ]\n        }\n      ]\n    }\n  }\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <api_key>",
  "Content-Type": "application/json"
]
let parameters = ["manifest": [
    "job": ["name": "string"],
    "run": ["tasks": [
        [
          "name": "string",
          "steps": [[]]
        ]
      ]]
  ]] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.islo.dev/jobs/name/validate")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```