---
title: "Get an archived agent config version"
method: GET
path: "/v1/projects/{project_id}/agents/{agent_id}/versions/{version}"
tags: ["Agent Versions"]
---

# Get an archived agent config version

`GET /v1/projects/{project_id}/agents/{agent_id}/versions/{version}`

## Request

- Base URL: `https://api.naturali.ai`
- URL: `https://api.naturali.ai/v1/projects/{project_id}/agents/{agent_id}/versions/{version}`
- 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 the exact configuration the agent held at a given version, so a generation can be traced back to the config that produced it.

## Path parameters

- `agent_id` string, required
- `version` integer, required

## Response `200`

Archived agent version

- AgentVersion: An immutable archive of an agent's configuration at one version.
  - `id` string: Public ID of the archived version
  - `agent_id` string: Public ID of the agent this version belongs to
  - `version` integer: The archived version number
  - `config` object: The agent's configuration as it stood at this version: every mutable field of the `Agent` schema (`instructions`, `model`, `tool_bindings`, `max_steps`, `tool_choice`, `stop_conditions`, `active_tool_ids`, `step_rules`, `boundary_policy`, `temperature`, `knowledge_config`, `output_schema`, `max_context_messages`, `max_output_tokens`, `reasoning`, `single_session_per_actor`, `on_approval_expiry`, `guardrail_ids`, `ai_provider_id`, `model_route_id`, `name`), and none of its identity or bookkeeping fields (`id`, `project_id`, `version`, `active_release`, timestamps). A literal credential in an inline `tool_bindings` definition is masked as on the `Agent` read, and a restore or release of such a version is refused with `400 LITERAL_CREDENTIAL`. Deliberately open rather than a fixed schema: an archive written by an earlier release of the runtime reflects the agent surface **of its own time**, so it may carry fields the current schema no longer defines, or lack ones it has since gained. Knowledge retrieval is not part of the snapshot — a version records which `knowledge_config` applied, while the documents and memory stores it resolves keep their own histories and are pinned at generation time.
  - `label` string, nullable: Optional human tag, set with `version_label` on the write that created this version. Restore, promote and abort set one automatically (e.g. `restored from v1`).
  - `eval_run_id` string, nullable: The eval run that cleared the release's `promotion_gate` when this version was promoted. Null for every version that did not go live through a gated promotion — which is most of them.
  - `created_by_principal_type` 'user' | 'api_key' | 'agent' | 'automation' | 'approval' | 'system': What kind of principal acted. `user` and `api_key` are authenticated callers, and the id is the user's (`user_…`) or the key's own (`key_…`), so a record names which key acted rather than its owner. `agent` is an agent writing under its own identity (`agent_…`). `automation` is the task engine acting on a dispatch outcome and `approval` an approval resolution; neither carries an id. `system` is the platform itself, with an id naming the mechanism (`retention_sweep`, `zero_retention`).
  - `created_by_principal_id` string, nullable: Public id of that principal: the user (`user_…`), or for API key auth the key itself (`key_…`), so the record names which key acted.
  - `created_at` string, date-time

## Other responses

- `400`: Bad Request — version is not a positive integer
- `401`: Unauthorized
- `403`: Forbidden
- `404`: Agent or version 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)