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POST
/
sessions
Create session
curl --request POST \
  --url https://app.harmonica.chat/api/v1/sessions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "topic": "<string>",
  "goal": "<string>",
  "context": "<string>",
  "critical": "<string>",
  "prompt": "<string>",
  "template_id": "<string>",
  "questions": [
    {
      "text": "<string>"
    }
  ],
  "cross_pollination": false,
  "widgets_enabled": false,
  "results_visibility": "host",
  "distribution": [
    {
      "group_id": "<string>"
    }
  ]
}
'
{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "topic": "<string>",
  "goal": "<string>",
  "participant_count": 123,
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "join_url": "<string>"
}

Documentation Index

Fetch the complete documentation index at: https://help.harmonica.chat/llms.txt

Use this file to discover all available pages before exploring further.

Authorizations

​
Authorization
string
header
required

API key authentication. Pass your key as a Bearer token. Keys use the format hm_live_<32 hex chars>. Generate keys from your Harmonica dashboard settings.

Body

application/json

Request body for creating a new session.

​
topic
string
required

Session topic / title

​
goal
string
required

What the session aims to achieve

​
context
string

Background context for participants (e.g. SESSION.md from a prior session)

​
critical
string

Critical question or constraint

​
prompt
string

Custom facilitation prompt. If omitted, a prompt is auto-generated server-side from the topic, goal, context, and critical fields. Falls back to a basic facilitation prompt if generation fails.

​
template_id
string

ID of a template to use

​
questions
object[]

Pre-session questions shown to participants before facilitation begins

​
cross_pollination
boolean
default:false

Enable cross-pollination of ideas between participant threads

​
widgets_enabled
boolean
default:false

Enable AI-emitted Polls and ratings widgets (SingleSelect, MultiSelect, RatingScale, RankingList) during the session. When true, the facilitator may call widget tools mid-conversation to present interactive inputs instead of plain text questions.

​
results_visibility
enum<string>
default:host

Who can see aggregated session results.

  • host (default) — only the session owner can see results.
  • participants — anyone who completed the session can see what others said (drives the end-of-chat "See what others said" link).
  • public — anyone with the session URL can see results without participating. MCP / harmonica-chat callers typically pass participants since programmatic and Telegram-distributed sessions usually want distributed visibility.
Available options:
public,
participants,
host
​
distribution
object[]

Distribution channels for the session (e.g. Telegram groups)

Response

Session created

Session object returned after creation. Extends SessionListItem with a join URL.

​
id
string<uuid>
required
​
topic
string
required
​
goal
string
required
​
status
enum<string>
required
Available options:
active
​
participant_count
integer
required
​
created_at
string<date-time>
required
​
updated_at
string<date-time>
required
​
join_url
string<uri>
required

Direct URL for participants to join the session