Create a skill version
⚠️
Preview — this feature is being built; the design below is the spec.
POST https://app.syntic.ai/v1/skills/{skill_id}/versionsUpload a new version of a skill. Versions are numbered from 1 and never change once created; requests and agents that pin an older version keep using it, while latest moves to the new one.
For how this fits into a full workflow, see Agent skills.
Headers
| Header | Required | Value |
|---|---|---|
Authorization | Yes | Bearer <key>: a private inference key (sk_live_...). See Authentication. |
syntic-beta | Yes, while in preview | agents-2026-11-01. Without it the call fails with 400 beta_required. See Versioning. |
Content-Type | Yes | application/json |
Path parameters
| Parameter | Type | Description |
|---|---|---|
skill_id | string | The skill id, starting with skill_. |
Body parameters
| Parameter | Type | Required | Notes |
|---|---|---|---|
file_id | string | Yes | A new ZIP with the same name in its SKILL.md header. |
Response
201 Created, Content-Type: application/json
{
"skill_id": "skill_01JBXM4",
"version": "4",
"created_at": 1792512000,
"files": 4,
"bytes_unzipped": 182044
}Examples
curl -sS https://app.syntic.ai/v1/skills/skill_01JBXM4/versions \
-H "Authorization: Bearer $SYNTIC_API_KEY" \
-H "syntic-beta: agents-2026-11-01" \
-H "Content-Type: application/json" \
-d '{
"file_id": "file_01JCE3G5J7L9N1Q3S5U7"
}'Errors
Errors use the error envelope and carry a request_id. Codes specific to this operation:
| Status | type | code | When |
|---|---|---|---|
| 400 | invalid_request_error | beta_required | The syntic-beta header is missing. |
| 400 | invalid_request_error | invalid_skill_package | Not a ZIP, no SKILL.md, or a bad header; message says which. |
| 413 | invalid_request_error | skill_too_large | Over 30 MB unzipped or 500 files. |
| 404 | not_found_error | skill_not_found | Unknown id, or another workspace’s skill. |
| 400 | invalid_request_error | skill_name_mismatch | The package’s name differs from the skill’s. |
| 401 | authentication_error | invalid_api_key | The key is missing, unknown, revoked or expired. |
| 429 | rate_limit_error | rate_limited | Too many requests; wait for Retry-After. See Rate-limit headers. |
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