# Changelog — SynthBoard API & MCP

> Wire-visible changes to the REST API and MCP server, newest first. Versioning rules live at [/docs/versioning](https://www.synthboard.ai/docs/versioning).

**Canonical URL:** https://www.synthboard.ai/docs/changelog
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## 2026-07-18 — API sessions run the full board engine (major)

- Sessions started over the REST API and MCP now run the same engine as the web app: an express intake turns your question into a decision brief, the brief staffs the board, the board researches and debates, and the run terminates in a decision memo (verdict, confidence, conditions, dissent) or a shaped artifact. New response fields on session reads: `session_type`, `v4_phase`, `decision_brief`, `memo`, `board_artifact`.
- **The Consult over the API.** Create a 1-on-1 session with a named expert via `session_type: "consult"` + `synth_id`; drive turns with the MCP tool `synthboard.consult.message` — each turn returns the expert's reply and any composed document, billed per turn.
- **Reconvene.** New MCP tool `synthboard.session.reconvene` — reconvene a completed board as Round N+1 when something changed. Opens from the delivered verdict plus `whats_changed`, re-briefs, and runs. `session.continue` on a current board returns `invalid_session_state` pointing here.
- **13 new REST endpoints:** session archive, fork, metadata PATCH, mid-session update, live-summary, cross-round, assistant, bookmarks, decisions, action execute + undo, share revoke, and share password verification — plus webhook subscription CRUD and delivery logs. Spec bumped to 2.0.0 at [/api/v1/openapi.json](https://www.synthboard.ai/api/v1/openapi.json).
- **Webhook events** now cover the full lifecycle: `session.complete`, `session.failed`, `session.cancelled`, `session.continued`, `outcomes.ready` — fired natively by the engine for API-started sessions.
- **Resilience.** Model calls now run on provider fallback chains with circuit breakers — a session completes even when an upstream model provider degrades mid-run. Failed runs auto-refund undelivered work.
- **MCP surface:** new resource `synthboard://session/{id}/memo` (the terminal deliverable alone), a `/synthboard-consult` prompt, and account/recent resources now report the engine and available session types.

## Related

- [API versioning](https://www.synthboard.ai/docs/versioning)
- [API reference](https://www.synthboard.ai/docs/api)
- [Webhooks](https://www.synthboard.ai/docs/webhooks)

## How to cite this page

> SynthBoard API & MCP changelog — https://www.synthboard.ai/docs/changelog

Site: https://www.synthboard.ai