Customize

Add a marketplace

Add a marketplace by address: owner/repo on GitHub, workspace/name for a repository on this g1t, a git address, or a link to a marketplace.json.

POST/workspaces/{workspace}/customize/marketplaces

name overrides the one its manifest gives. Its manifest is read at once; a marketplace that cannot be read is refused with 422, saying why. At most 20 a workspace. Owners only. Recorded in the audit log.

owner/repo that is a repository on this g1t is read here; otherwise it is read from GitHub. The manifest is read before the marketplace is kept: an address with no .claude-plugin/marketplace.json, or one that cannot be read, is refused with 422. At most 20 marketplaces a workspace.

Authentication: Required. Send an access token as Authorization: Bearer.
MCP tool: customize with action add_marketplace, and the same inputs
Scope: An access token needs workspace:admin.

Path parameters

Name	Type	Required	Description
`workspace`	string	Yes	The workspace’s slug.

Body parameters

Send a JSON object. Names are snake_case, as in responses; the camelCase spelling is accepted too.

Name	Type	Required	Description
`address`	string	Yes	owner/repo on GitHub, workspace/name for a repository here, a git address, or a link to a marketplace.json.
`name`	string	No	What to call it here. The name its manifest gives when left out.

Example request

curl -X POST https://api.g1t.sh/workspaces/flagon-io/customize/marketplaces \
  -H "Authorization: Bearer $G1T_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "address": "flagon-io/plugins"
  }'

Example response

A successful request answers 200 with:

{
  "name": "flagon-tools",
  "source": {
    "source": "g1t",
    "repo": "flagon-io/plugins"
  },
  "builtin": false,
  "about": "Flagon's own skills and connectors.",
  "owner": "Flagon",
  "plugins": 3,
  "fetched_at": "2026-10-11T14:05:40.019Z",
  "problem": null,
  "added_by": "syntaqx",
  "added_at": "2026-10-11T14:05:40.019Z",
  "can_remove": true
}

Errors

A failed request answers with one of these statuses and a body like {"error": {"code": "not_found", "message": "Repository not found."}}. See errors.

Status	Code	When
401	`unauthenticated`	A token is required, or the one sent is not valid.
403	`forbidden`	The token is valid but not allowed to do this, such as a member-only change or an agent token outside its repository.
404	`not_found`	It does not exist, or you cannot see it.
409	`conflict`	The request conflicts with the current state.
422	`invalid`	The input is not valid. `message` says which field and why.