---
title: "Add a persona to the global library (Feather staff only)"
method: POST
path: "/v1/library/personas"
tags: ["library"]
---

# Add a persona to the global library (Feather staff only)

`POST /v1/library/personas`

## Request body

- LibraryPersonaCreate — Create a library persona (Feather-staff only at the router layer).
  - `name` string, required
  - `description` string, nullable
  - `body` string, required
  - `traits` object
  - `behavior_config` PersonaBehaviorConfig — Advanced simulation knobs attached to a persona. Stored as JSONB on ``personas.behavior_config``; per-run overrides will reuse this shape on ``SimulationRun`` (ENG-474).
    - `first_speaker` 'persona' | 'agent'
    - `cut_in` PersonaCutInConfig — Persona-as-interrupter — when the agent is speaking, when does the persona cut in? Mirrors voice ``interruption_*`` knobs on ``VoicePipelineConfig``.
      - `min_words` integer
      - `min_duration_ms` integer
      - `backoff_ms` integer
    - `language` string, nullable
    - `background_noise` 'none' | 'office' | 'cafe' | 'city' | 'keyboard_typing'
    - `background_noise_volume` number
    - `wait_seconds` number
    - `yield_on_overlap` PersonaYieldConfig — Persona-as-yielder — when the persona is speaking and the agent starts talking, when does the persona stop? Whichever threshold fires first triggers the yield. ``None`` disables that dimension.
      - `after_words` integer, nullable
      - `after_seconds` number, nullable
    - `interruption_mode` 'off' | 'low' | 'medium' | 'high'
    - `backchannel_style` 'neutral' | 'impatient' | 'polite'
    - `backchannel_overrides` string[], nullable
    - `reaction_pause_ms_min` integer
    - `reaction_pause_ms_max` integer
  - `tags` string[]

## Response `201`

Successful Response

- LibraryPersonaResponse — Library persona payload returned by ``/v1/library/personas`` routes.
  - `id` string, uuid, required
  - `name` string, required
  - `description` string, nullable, required
  - `body` string, required
  - `traits` object, required
  - `behavior_config` PersonaBehaviorConfig, required — Advanced simulation knobs attached to a persona. Stored as JSONB on ``personas.behavior_config``; per-run overrides will reuse this shape on ``SimulationRun`` (ENG-474).
    - `first_speaker` 'persona' | 'agent'
    - `cut_in` PersonaCutInConfig — Persona-as-interrupter — when the agent is speaking, when does the persona cut in? Mirrors voice ``interruption_*`` knobs on ``VoicePipelineConfig``.
      - `min_words` integer
      - `min_duration_ms` integer
      - `backoff_ms` integer
    - `language` string, nullable
    - `background_noise` 'none' | 'office' | 'cafe' | 'city' | 'keyboard_typing'
    - `background_noise_volume` number
    - `wait_seconds` number
    - `yield_on_overlap` PersonaYieldConfig — Persona-as-yielder — when the persona is speaking and the agent starts talking, when does the persona stop? Whichever threshold fires first triggers the yield. ``None`` disables that dimension.
      - `after_words` integer, nullable
      - `after_seconds` number, nullable
    - `interruption_mode` 'off' | 'low' | 'medium' | 'high'
    - `backchannel_style` 'neutral' | 'impatient' | 'polite'
    - `backchannel_overrides` string[], nullable
    - `reaction_pause_ms_min` integer
    - `reaction_pause_ms_max` integer
  - `tags` string[], required
  - `created_by` string, nullable, required
  - `created_at` string, date-time, required
  - `updated_at` string, date-time, required

## Other responses

- `400` — Bad request
- `401` — Authentication required
- `422` — Validation Error

---

[API](https://skmtc.net/oneloop-hq/apis/feather-api.md) · [All operations](https://skmtc.net/oneloop-hq/apis/feather-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/oneloop-hq/feather-api/versions/888bdd5c076e/schema)