API referenceAgents APISkillsVersionsCreate a version

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}/versions

Upload 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

HeaderRequiredValue
AuthorizationYesBearer <key>: a private inference key (sk_live_...). See Authentication.
syntic-betaYes, while in previewagents-2026-11-01. Without it the call fails with 400 beta_required. See Versioning.
Content-TypeYesapplication/json

Path parameters

ParameterTypeDescription
skill_idstringThe skill id, starting with skill_.

Body parameters

ParameterTypeRequiredNotes
file_idstringYesA 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:

StatustypecodeWhen
400invalid_request_errorbeta_requiredThe syntic-beta header is missing.
400invalid_request_errorinvalid_skill_packageNot a ZIP, no SKILL.md, or a bad header; message says which.
413invalid_request_errorskill_too_largeOver 30 MB unzipped or 500 files.
404not_found_errorskill_not_foundUnknown id, or another workspace’s skill.
400invalid_request_errorskill_name_mismatchThe package’s name differs from the skill’s.
401authentication_errorinvalid_api_keyThe key is missing, unknown, revoked or expired.
429rate_limit_errorrate_limitedToo many requests; wait for Retry-After. See Rate-limit headers.
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