Improve OpenChamber responsiveness under large session workloads while fixing
cache, synchronization, and persistence correctness across runtimes, projects,
directories, and worktrees.
- prioritize selected and visible sessions during bootstrap and defer
non-critical enrichment work
- reduce redundant message loading, event processing, store publication, and
hidden sidebar work
- prevent stale session and message requests from overwriting newer
authoritative state
- preserve existing data when authoritative fetches fail instead of treating
failures as successful empty responses
- scope session materialization, messages, drafts, queues, todos, pins,
permissions, folders, tabs, Git state, and pull request data by runtime and
directory identity
- harden runtime switching, reconnect, cleanup, mutation reconciliation, and
persisted-state ordering
- preserve live subagent Task linkage when metadata arrives after an older
message request or while streaming parts are suspended
- coalesce overlapping tail refreshes without losing newer refresh demand
- improve cold-session loading by moving deferrable work out of the critical
bootstrap path
- isolate URL authentication, mobile credentials, native secrets, and other
runtime-owned state across endpoint changes
- bound long-lived caches and remove avoidable allocations from event and
rendering hot paths
- limit virtualization to archive collections where it improves rendering
without disrupting active sidebar layout
- stabilize session folders, pin ordering, expanded state, and persisted
sidebar behavior
- open skill files through the same secure editor and outside-workspace grant
flow used by file navigation, including worktree sessions
- expand regression coverage for stale completions, runtime collisions,
reconnect behavior, persistence races, authoritative empty results, and
subagent refresh ordering
- document the updated synchronization, cache ownership, performance, and
runtime-isolation invariants
* fix: add concurrency controls for multiple sessions using the same provider
Adds OS-inspired scheduling primitives (from HiveMind/AIMD research) to prevent
concurrent sessions from the same provider from experiencing slowdowns, random
stops, and cascading failures.
Server-side:
- Health check skips OpenCode restart when sessions are actively busy — a busy
server under concurrent load can fail the health check timeout without being
dead. Staleness guard forces restart if unhealthy+busy persists >2 minutes.
- Upstream SSE stall timeout scaled from 20s to 60s to avoid unnecessary
reconnections when multiple sessions are waiting for LLM responses.
Client-side (HiveMind primitives, arXiv:2604.17111):
- Transparent retry with exponential backoff (1s→2s→4s, max 32s) for
429/502/503/504 errors — the #1 most effective primitive from the paper.
- Circuit breaker: opens after 3 consecutive retryable errors, cooldown
doubles each trip (30s→60s→120s, capped 128s), matching TCP AIMD.
- Per-provider session tracking with TTL eviction (1h idle sweep).
- Fetch-level retry gated on AbortError/TypeError only (not DNS failures).
Refs github-code-review skill findings (all 8 issues resolved).
* fix: use definite assignment assertion for response variable
Fixes TS2454: Variable 'response' is used before being assigned
in strict mode. The for-loop body always assigns it on every path
that reaches the post-loop code, but TS can't prove that.
* fix: add cleanupSession to error paths and remove unreachable code
P1 fixes (Greptile review):
- cleanupSession called on fetch error throw path
- cleanupSession called on non-retryable HTTP error throw path
- Removed unreachable post-loop code (loop always terminates via return or throw)
Adds explicit post-loop throw to satisfy TypeScript strict return check.
* fix: address Greptile review feedback on concurrent session controls
Removes client-side session tracking that leaked on normal completion paths.
The session tracking was redundant — the server-side health check already reads from
sessionRuntime.getSessionActivitySnapshot() for busy-session detection.
Changes:
- Remove activeSessions Set and all session-tracking functions from provider-tracker
- Remove trackSessionStarted/cleanupSession calls from client.ts
- Remove unreachable (response as Response) block after retry loop
- Make upstreamStallTimeoutMs conditional: 60s when >1 sessions, 20s otherwise
Refs #1069
* fix: enforce dynamic concurrency safeguards
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Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>
Bohdan Triapitsyn