Author a Skill proposal

curl --request POST \
  --url https://api.checkfu.com/v1/skill-proposals \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'checkfu-version: <checkfu-version>' \
  --data '
{
  "source_session_ids": [
    "<string>"
  ],
  "model_routing_profile_key": "<string>",
  "instructions": "<string>",
  "skill_name": "<string>"
}
'

import requests

url = "https://api.checkfu.com/v1/skill-proposals"

payload = {
    "source_session_ids": ["<string>"],
    "model_routing_profile_key": "<string>",
    "instructions": "<string>",
    "skill_name": "<string>"
}
headers = {
    "checkfu-version": "<checkfu-version>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'checkfu-version': '<checkfu-version>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    source_session_ids: ['<string>'],
    model_routing_profile_key: '<string>',
    instructions: '<string>',
    skill_name: '<string>'
  })
};

fetch('https://api.checkfu.com/v1/skill-proposals', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.checkfu.com/v1/skill-proposals",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'source_session_ids' => [
        '<string>'
    ],
    'model_routing_profile_key' => '<string>',
    'instructions' => '<string>',
    'skill_name' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "checkfu-version: <checkfu-version>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.checkfu.com/v1/skill-proposals"

	payload := strings.NewReader("{\n  \"source_session_ids\": [\n    \"<string>\"\n  ],\n  \"model_routing_profile_key\": \"<string>\",\n  \"instructions\": \"<string>\",\n  \"skill_name\": \"<string>\"\n}")

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

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

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.checkfu.com/v1/skill-proposals")
  .header("checkfu-version", "<checkfu-version>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"source_session_ids\": [\n    \"<string>\"\n  ],\n  \"model_routing_profile_key\": \"<string>\",\n  \"instructions\": \"<string>\",\n  \"skill_name\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.checkfu.com/v1/skill-proposals")

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

request = Net::HTTP::Post.new(url)
request["checkfu-version"] = '<checkfu-version>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"source_session_ids\": [\n    \"<string>\"\n  ],\n  \"model_routing_profile_key\": \"<string>\",\n  \"instructions\": \"<string>\",\n  \"skill_name\": \"<string>\"\n}"

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

{
  "id": "<string>",
  "status": "authoring",
  "source_session_ids": [
    "<string>"
  ],
  "agent": "<string>",
  "model_routing_profile_key": "<string>",
  "instructions": "<string>",
  "skill": {
    "name": "<string>",
    "description": "<string>",
    "kind": "instructional",
    "entry": "<string>",
    "content_sha256": "<string>"
  },
  "verification_material": {
    "task": "<string>",
    "rubric": "<string>"
  },
  "verifications": [
    {
      "session": "<string>",
      "started_at": "<string>",
      "result": {
        "verdict": "satisfied",
        "explanation": "<string>",
        "cost_tokens": 1,
        "completed_at": "<string>"
      },
      "source_version": 1,
      "principal": "<string>",
      "launched_at": "<string>"
    }
  ],
  "submission": {
    "skill_source": "<string>",
    "branch": "<string>",
    "commit_sha": "<string>",
    "submitted_at": "<string>"
  },
  "adoption": {
    "skill_id": "<string>",
    "skill_version": 1,
    "observed_at": "<string>"
  },
  "error": "input_session_unavailable",
  "usage": {
    "input_tokens": 1,
    "cached_input_tokens": 1,
    "cache_write_input_tokens": 1,
    "output_tokens": 1,
    "reasoning_output_tokens": 1,
    "total_tokens": 1
  },
  "created_at": "<string>",
  "updated_at": "<string>",
  "version": 1,
  "submission_attempt": {
    "source_version": 1,
    "skill_source": "<string>",
    "acted_as": "<string>",
    "branch": "<string>",
    "base_commit_sha": "<string>",
    "base_content_sha256": "<string>",
    "expected_base_digest": "<string>",
    "prepared_commit_sha": "<string>",
    "started_at": "<string>"
  }
}

{
  "error": {
    "type": "validation.malformed",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#validation-malformed"
  }
}

{
  "error": {
    "type": "auth.invalid_key",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#auth-invalid-key"
  }
}

{
  "error": {
    "type": "auth.disabled_tenancy",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#auth-disabled-tenancy"
  }
}

{
  "error": {
    "type": "validation.not_found",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#validation-not-found"
  }
}

{
  "error": {
    "type": "validation.idempotency_conflict",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#validation-idempotency-conflict"
  }
}

{
  "error": {
    "type": "model.no_eligible_model",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#model-no-eligible-model"
  }
}

{
  "error": {
    "type": "budget.exceeded",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#budget-exceeded"
  }
}

{
  "error": {
    "type": "runtime.internal",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#runtime-internal"
  }
}

Author a Skill proposal

Start a model-curated authoring job over source Session logs; its artifact is a complete single-file Agent Skill directory plus the task and rubric that verify it, immutable from the moment it drafts. Requires a model_routing_profile_key logical name — there is no deterministic author — and each source Session may appear at most once. Returns the SkillProposal in authoring; accepts an optional Idempotency-Key.

Checkfu support posture: alpha; hosted. Required evidence journey: skill-delivery. Deployment-specific readiness and the latest proven release are available from GET /v1/support/capabilities.

POST

skill-proposals

curl --request POST \
  --url https://api.checkfu.com/v1/skill-proposals \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'checkfu-version: <checkfu-version>' \
  --data '
{
  "source_session_ids": [
    "<string>"
  ],
  "model_routing_profile_key": "<string>",
  "instructions": "<string>",
  "skill_name": "<string>"
}
'

import requests

url = "https://api.checkfu.com/v1/skill-proposals"

payload = {
    "source_session_ids": ["<string>"],
    "model_routing_profile_key": "<string>",
    "instructions": "<string>",
    "skill_name": "<string>"
}
headers = {
    "checkfu-version": "<checkfu-version>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'checkfu-version': '<checkfu-version>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    source_session_ids: ['<string>'],
    model_routing_profile_key: '<string>',
    instructions: '<string>',
    skill_name: '<string>'
  })
};

fetch('https://api.checkfu.com/v1/skill-proposals', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.checkfu.com/v1/skill-proposals",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'source_session_ids' => [
        '<string>'
    ],
    'model_routing_profile_key' => '<string>',
    'instructions' => '<string>',
    'skill_name' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "checkfu-version: <checkfu-version>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.checkfu.com/v1/skill-proposals"

	payload := strings.NewReader("{\n  \"source_session_ids\": [\n    \"<string>\"\n  ],\n  \"model_routing_profile_key\": \"<string>\",\n  \"instructions\": \"<string>\",\n  \"skill_name\": \"<string>\"\n}")

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

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

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.checkfu.com/v1/skill-proposals")
  .header("checkfu-version", "<checkfu-version>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"source_session_ids\": [\n    \"<string>\"\n  ],\n  \"model_routing_profile_key\": \"<string>\",\n  \"instructions\": \"<string>\",\n  \"skill_name\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.checkfu.com/v1/skill-proposals")

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

request = Net::HTTP::Post.new(url)
request["checkfu-version"] = '<checkfu-version>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"source_session_ids\": [\n    \"<string>\"\n  ],\n  \"model_routing_profile_key\": \"<string>\",\n  \"instructions\": \"<string>\",\n  \"skill_name\": \"<string>\"\n}"

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

{
  "id": "<string>",
  "status": "authoring",
  "source_session_ids": [
    "<string>"
  ],
  "agent": "<string>",
  "model_routing_profile_key": "<string>",
  "instructions": "<string>",
  "skill": {
    "name": "<string>",
    "description": "<string>",
    "kind": "instructional",
    "entry": "<string>",
    "content_sha256": "<string>"
  },
  "verification_material": {
    "task": "<string>",
    "rubric": "<string>"
  },
  "verifications": [
    {
      "session": "<string>",
      "started_at": "<string>",
      "result": {
        "verdict": "satisfied",
        "explanation": "<string>",
        "cost_tokens": 1,
        "completed_at": "<string>"
      },
      "source_version": 1,
      "principal": "<string>",
      "launched_at": "<string>"
    }
  ],
  "submission": {
    "skill_source": "<string>",
    "branch": "<string>",
    "commit_sha": "<string>",
    "submitted_at": "<string>"
  },
  "adoption": {
    "skill_id": "<string>",
    "skill_version": 1,
    "observed_at": "<string>"
  },
  "error": "input_session_unavailable",
  "usage": {
    "input_tokens": 1,
    "cached_input_tokens": 1,
    "cache_write_input_tokens": 1,
    "output_tokens": 1,
    "reasoning_output_tokens": 1,
    "total_tokens": 1
  },
  "created_at": "<string>",
  "updated_at": "<string>",
  "version": 1,
  "submission_attempt": {
    "source_version": 1,
    "skill_source": "<string>",
    "acted_as": "<string>",
    "branch": "<string>",
    "base_commit_sha": "<string>",
    "base_content_sha256": "<string>",
    "expected_base_digest": "<string>",
    "prepared_commit_sha": "<string>",
    "started_at": "<string>"
  }
}

{
  "error": {
    "type": "validation.malformed",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#validation-malformed"
  }
}

{
  "error": {
    "type": "auth.invalid_key",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#auth-invalid-key"
  }
}

{
  "error": {
    "type": "auth.disabled_tenancy",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#auth-disabled-tenancy"
  }
}

{
  "error": {
    "type": "validation.not_found",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#validation-not-found"
  }
}

{
  "error": {
    "type": "validation.idempotency_conflict",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#validation-idempotency-conflict"
  }
}

{
  "error": {
    "type": "model.no_eligible_model",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#model-no-eligible-model"
  }
}

{
  "error": {
    "type": "budget.exceeded",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#budget-exceeded"
  }
}

{
  "error": {
    "type": "runtime.internal",
    "message": "<string>",
    "more": "https://docs.checkfu.com/reference/errors#runtime-internal"
  }
}

Authorizations

Authorization

string

header

required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Headers

checkfu-version

enum<string>

required

Available options:

2026-08-27

idempotency-key

string

Maximum string length: 255

Body

application/json

source_session_ids

string[]

required

Required array length: 1 - 8 elements

Pattern: ^sess_[0-9a-f]{32}$

model_routing_profile_key

string

required

Pattern: ^[a-z0-9](?:[a-z0-9._-]{0,93})$

instructions

string

Required string length: 1 - 4096

skill_name

string

Pattern: ^[a-z0-9](?:[a-z0-9._-]{0,93})$

Response

an error exactly on authoring failure, an artifact exactly past authoring, a pending submission while submitting and optionally retained after submission for recovery, a completed submission exactly on submitted, adoption only after submission, and verification states only with a recorded attempt

string

required

Pattern: ^skp_[0-9a-f]{32}$

status

enum<string>

required

Available options:

authoring,

drafted,

authoring_failed,

verifying,

verified,

verification_failed,

submitting,

submitted,

discarded

source_session_ids

string[]

required

Required array length: 1 - 8 elements

Pattern: ^sess_[0-9a-f]{32}$

agent

string

required

Pattern: ^agent_[0-9a-f]{32}$

model_routing_profile_key

string

required

Pattern: ^[a-z0-9](?:[a-z0-9._-]{0,93})$

instructions

string | null

required

Maximum string length: 4096

skill

object | null

required

Show child attributes

verification_material

object | null

required

Show child attributes

verifications

object[]

required

Maximum array length: 8

Show child attributes

submission

object | null

required

Show child attributes

adoption

object | null

required

Show child attributes

error

enum<string> | null

required

Available options:

input_session_unavailable,

input_sessions_too_large,

authoring_failed,

internal

usage

object

required

Show child attributes

created_at

string

required

updated_at

string

required

version

integer

required

Required range: x > 0

submission_attempt

object | null

Show child attributes

Developer tools

Canonical tables

Author protocols

Generated HTTP API

Author a Skill proposal

Authorizations

Headers

Body

Response