Design Notes & History¶
Design records behind Sympozium's features, kept for maintainers and for anyone who wants to know why something works the way it does. They are not user guides: for how things work today, start with Architecture and the Concepts pages.
Design documents and decisions¶
- Celln: single execution plane
- ADR: Harness identity, Celln placement and approved tool lending
- Celln namespace authorisation and cross-repository conformance contract
- Celln platform policy resolution
- Exact-turn cancellation
- Celln Harness starter toolbox — release requirements
- Epic: enduring AgentRuns with persistent Harness parents and disposable turn cells
- Persistent AgentHarness sessions
- Design: AgentRun-level dollar cost estimation
- Design: accelerator energy collectors
- Roadmap: Evolving Ensemble into a Multi-Agent Coordination System
Qualification and implementation records¶
Checkpoints from the Celln enduring-run and tenancy epics (#464, #495).
- Parent/turn implementation inventory — epic #464
- Model gateway live-API checkpoint (#502)
- Celln tenancy component security suite (#509)
- Celln release evidence validation (#510)
- Framework: installed scoped Celln review 495
- Framework manual acceptance target — epic #495
- Framework workspace: real-provider product walkthrough
Celln milestone records¶
Step-by-step records from the September 2026 Celln build-out: issuance, catalogue, router and early harness milestones that the fleet has since superseded. Each page carries a historical note.
- Sympozium — Simplified Architecture
- Catalogue controller bridge — integration in progress
- Durable catalogue issuance from the operator CLI
- Enduring Celln run contract (development)
- Isolated Celln framework manual review
- Harness + Celln selection UX: administrator-assisted one-shot delivery
- Local Harness + Celln hands-on session
- Verified remote issuer client
- Authenticated Celln host issuer service
- Installing the host issuer under systemd
- Native JSON Harness in Celln: explicit binding
- Live catalogue-backed Harness proof
- Catalogue-backed local host issuance
- One-shot Harness-in-Celln MLP acceptance index
- One-shot borrowed-tool handoff
- One-shot Harness-in-Celln: MLP installation checklist
- Isolated Kind pod-to-host proof: network boundary
- One-shot Harness-in-Celln troubleshooting
- Independent Celln model authority
- Local persistent-parent hands-on session
- Native Celln parent-only controller
- Celln tool permission preview
- Experimental in-cell reference Harness binding
- Automatic issuance for registered catalogue compositions
- Experimental Celln router deployment
- Frozen-route execution transport
- Verified router prewarm client
- Celln runtime profile: metadata and independent readiness
- Celln tenancy migration: inventory and stop boundaries (#508)
- Tool authority resolution core
- Experimental Celln executable-tool catalogue metadata
- Operator review and verified catalogue publication
Evidence¶
Recorded qualification runs. JSON evidence files sit alongside these in
docs/evidence/.
- API startup with disabled/unavailable NATS — 2026-09-07
- Deployed Celln capability discovery — 2026-09-07
- Celln fleet on multi-node Kind — 2026-09-14
- Framework native installation qualification — 2026-09-09
- Framework router migration and cache regression qualification
- Native release handoff — 2026-09-09
- Native Celln starter system acceptance — 2026-09-09
Release notes¶
See also the original design document (February 2026) and the CHANGELOG.