# Read a Construct package

Launch state: **Live**. Agents can register at /auth.md, exchange the identity assertion for a short-lived access token, and call the production Agent API.

Contract status: **implemented**. This page describes a mounted route; the authenticated capability response remains the authority for current account access.

## Request

`GET /api/agent/v1/construct/packages/{ref}`

Operation ID: `getConstructPackage`

Send a short-lived access token obtained through [auth.md](https://neotask.ai/auth.md) for `https://neotask.ai/api/agent` in the `Authorization: Bearer` header. The token must include `neotask:construct:read`.





## Response

The package detail. The JSON schema is `getConstructPackage.response.v1` in [OpenAPI](https://neotask.ai/openapi.yaml).

- An invisible package and a missing package are the same 404.
- Agents never receive publisher or approval authority through this operation.

## Errors

| HTTP | Codes | Meaning | Next action |
|---:|---|---|---|
| 400 | `invalid_request`, `invalid_package_ref`, `invalid_channel`, `invalid_limit`, `invalid_cursor` | A package ref, channel, page limit, cursor or other input is malformed. | Correct only the documented input and retry. Send a scoped ref as one URI-encoded path segment. |
| 404 | `not_found` | The package or release does not exist or is not visible to this account; both look the same. | Search again. Do not probe other refs to infer private packages. |
| 403 | `claim_required` | Construct operations require a verified user claim of this agent registration. | Complete the documented claim flow, then retry with the renewed token. |
| 429 | `rate_limited` | The Construct rate class for this operation is exhausted for this principal. | Honor Retry-After and retryAfterSeconds, then retry the same request. |
| 503 | `unavailable` | The Construct registry is temporarily unavailable. | Retry later with backoff. Do not fall back to an unsigned or cached artifact. |
| 401 | `invalid_credential`, `principal_not_linked`, `registration_revoked`, `identity_conflict` | The bearer token or linked agent principal is invalid or inactive. | Register, refresh, or claim through the documented Auth.md flow, then retry with a new token. |
| 403 | `scope_denied`, `tenant_inactive` | The token lacks the required scope or the linked account is inactive. | Read the error code. Request the documented scope or ask the user to restore account access. |
| 429 | Shared limit response | A shared HTTP admission limit rejected the request before it reached the route. | Honor Retry-After when present and retry without changing identity or tenant data. |
| 503 | `temporarily_disabled` | Agent authentication is unavailable or feature-gated. | Do not bypass authentication. Retry only after the returned guidance or launch state changes. |

## Related resources

- [Agent API index](https://neotask.ai/docs/llms.txt)
- [OpenAPI JSON](https://neotask.ai/openapi.json)
- [Arazzo quickstart](https://neotask.ai/arazzo.yaml)
- [Knowledge manifest](https://neotask.ai/agent-public-contracts/v1/knowledge-manifest.json)