Changelog

6 September 2026

• Dashboard Agents, Tools, and Sessions pages manage agents, tool versions, deployments, and sessions.
• Usage and limits documents GET /v1/usage and the three per-tenant rate limits.
• The status page reports component health.
• Deployment rollback selects an active deployment for new slug sessions.
• Per-operation tool result schemas support top-level oneOf and anyOf branches.
• SDKs published: @alethi/pantheon-chat 0.1.0 on npm, pantheon-chat 0.1.0 on PyPI.
• Email verification and password reset.
• Build on Pantheon page.
• llms.txt.

4 September 2026

• Slug sessions now prefer the newest published deployment.
• Tool lifecycle events now share one tool_call_id.

3 September 2026

• Session streams now deliver live ephemeral deltas with event_deltas=true.
• SESSION_BUSY now includes the active run and recovery routes.
• Run cancellation now releases a busy session.
• Sandbox failures now return HTTP 503 with a safe message.
• Agents can opt out of sandbox creation.
• Sessions now report sandbox_status.
• Application tool waits now default to 30 minutes.
• Run claims now use owner tokens, leases, and reconciliation.

Contract hardening

• The checked-in OpenAPI contract now covers every served route.
• Contract tests now require exact route parity.
• Worker tests can limit claims to one tenant.

Open

See Known issues for current impact and workarounds.

Pitfalls