---
title: "Get a continuation chain"
method: GET
path: "/v1/projects/{project_id}/chains/{chain_id}"
tags: ["Chains"]
---

# Get a continuation chain

`GET /v1/projects/{project_id}/chains/{chain_id}`

## Request

- Base URL: `https://api.naturali.ai`
- URL: `https://api.naturali.ai/v1/projects/{project_id}/chains/{chain_id}`
- Auth: one of:
  - HTTP bearer
  - OAuth 2 (authorization code, authorization URL `https://api.naturali.ai/authorize`, token URL `https://api.naturali.ai/token`, scopes: `mcp:access`)

Returns a single continuation chain. To read the generations in it, list generations filtered by `chain_id`.

## Path parameters

- `chain_id` string, required

## Response `200`

Continuation chain

- Chain
  - `id` string
  - `project_id` string
  - `agent_id` string, nullable: The agent whose continuation opened the chain. A chain can span agents, so this names its origin rather than an owner. Held as a plain id, not a reference the platform maintains — deleting the agent leaves the chain record intact.
  - `status` 'active' | 'concluded' | 'expired' | 'budget_exhausted': `active` — hops are still being spawned. `concluded` — a member finished with nothing left pending; not terminal, since a decision months later can spawn another hop and put the chain back to `active`. `expired` — a held approval lapsed and the agent does not react to expiry, so nothing resumed it. `budget_exhausted` — a hop was refused by the chain budget.
  - `generation_count` integer: Generations in the chain, the root included — the same population `GET /v1/projects/{project_id}/generations?chain_id=<id>` returns. Re-derived on every hop, so it is a description of the chain, never the thing the budget is enforced against.
  - `last_generation_at` string, date-time, nullable: When the chain last gained a generation
  - `created_at` string, date-time
  - `updated_at` string, date-time

## Other responses

- `401`: Unauthorized
- `403`: Forbidden
- `404`: Chain not found

---

[API](https://skmtc.dev/naturali/apis/naturali-ai-api.md) · [All operations](https://skmtc.dev/naturali/apis/naturali-ai-api/llms.txt) · [OpenAPI document](https://skmtc.dev/naturali/apis/naturali-ai-api/revisions/e4905b78f422?raw)