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Backend-driven warming targeting whatever provider a conversation uses (incl. the
external Claude provider-anthropic). Core engine + on/off + last-cache-% done;
interval-as-view-control pending a ui-contract NumberField (surface-system gap).
Mechanism:
- kernel: expose HostAPI.emit (typed bus event emit; counterpart of on)
- session-orchestrator: turnStarted/turnSettled event hooks (conversationId/cwd/model);
warm() service (cacheWarmHandle) reusing the real-turn assembly (byte-identical prefix,
provider-agnostic), refuses mid-turn, never persists/emits, returns Usage
- cache-warming (new ext): per-conversation timers (arm on settle, cancel on start,
in-flight invalidation), calls warm(), pct=round(clamp(cacheRead/input,0,1)*100),
persists {enabled,intervalMs} (default on/240s), registers a controls surface
- host-bin: register cache-warming; transport-http: HostAPI stub +emit (fan-out)
Honors old-code invariants. 760 vitest + 109 bun = 869 tests; tsc -b EXIT 0; biome clean.
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Skills are markdown in .skills/ dirs (~/.skills + <cwd>/.skills, cwd shadows home;
name = filename). Format: line1 summary, line2 ---, body line3+; load strips the
first two lines; malformed = no summary but still loadable.
Mechanism (first use of the context-assembly filter chain, §3.2):
- kernel: expose HostAPI.applyFilters (delegates to bus.applyFilters)
- session-orchestrator: define/export toolsFilter + ToolAssembly; apply once per turn
before runTurn (cache-stable across steps), threading cwd + conversationId
- skills (new ext): pure parse/merge/render + load_skill tool (live read, path-contained)
+ a toolsFilter filter rewriting load_skill's description + name enum per cwd
- host-bin: register skills in CORE_EXTENSIONS
- transport-http: fix HostAPI test stub for the new applyFilters method (fan-out)
734 vitest + 109 bun = 843 tests; tsc -b EXIT 0; biome clean; clean live boot.
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split (B2)
FE slice 1 — backend-declared, frontend-agnostic surface system (verified live): new types-only @dispatch/ui-contract (SurfaceSpec / field kinds / region / ActionRef / catalog), surface-registry (typed service handle), transport-ws (Bun WS :24205, path-agnostic upgrade), surface-loaded-extensions (first real surface); kernel HostAPI.getExtensions; host-bin wiring; bin/up. Harness: retire AGENTS 'backend only', ORCHESTRATOR §3/§7/§8, frontend-design.md locked.
B2 — wire-types split (chat-slice prerequisite): new types-only @dispatch/wire single-sources the wire ABI (AgentEvent + 11 variants; conversation model Chunk/ChatMessage/Role/TurnId/StepId + 6 chunk variants; Usage) with zero @dispatch/* deps. @dispatch/kernel re-exports via shims so its public surface is byte-identical (zero consumer blast radius). transport-contract re-exports AgentEvent from @dispatch/wire and drops its @dispatch/kernel dependency, so HTTP clients (the web frontend) consume the wire without the kernel runtime.
tsc -b + biome clean; 460 vitest + 77 bun pass.
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verbatim before/after -> LogRecord.body (273 tests)
contracts/logging.ts reduced to pure types; createLogger (+ helpers) moved to kernel/src/logging/ — @dispatch/kernel still exports it (host-bin/tool-read-file unaffected).
Span body channel (Option A): Logger.span / Span.child / Span.end accept an optional body string -> SpanOpenRecord.body / SpanCloseRecord.body. Large verbatim payloads now use body, not stringified attributes (store-fat-serve-thin; attributes stay thin/queryable for D9).
before: run-turn emits a 'prompt' span with the verbatim messages+tools in body (small scalars in attrs). after: provider.request span carries the verbatim request in body; attrs thin, auth self-redacted.
Verified: tsc -b clean, 273 tests, biome 0 warnings/0 infos. Live boot: prompt + provider.request bodies present and correlated (shared turnId); request.body no longer in attributes; auth-key leak count = 0.
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sink (250 tests)
Structured, agent-first logging captured durably to an append-only journal file.
Kernel (contracts/logging.ts): leveled/attributed Logger + Span, auto-scoped per extension (host stamps manifest.id, unspoofable), incremental span records (open/close) for crash-reconstructable traces, injected LogSink (pure record-builder). ctx.log on ToolContract; runTurn opens turn/step/tool-call spans and captures the verbatim pre-mutation prompt (the 'before') on the step span.
journal-sink (new package, bootstrap dep — not an extension): LogSink appending NDJSON to a rotating journal; pure serialize + thin fs edge; fail-safe drop, never blocks a turn. host-bin injects it via HostDeps; session-orchestrator threads host.logger (childed per turn) into runTurn.
Redaction is per-extension self-redaction (no shared helper — isolation over DRY). The out-of-process collector + SQLite store + the verbatim 'after' provider.request capture are Phase B / next (notes/observability-design.md §10/§11).
Verified: tsc -b clean, 250 tests (218→+32), biome clean. Live boot: a turn's journal holds host logs + turn/step spans (open+close) + the prompt:before record with the verbatim messages array.
Harness: ORCHESTRATOR §3 rule-scoping map; .dispatch/rules/isolation-over-dry.md; notes/observability-design.md (design D1–D10 + Phase A/B plan).
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storage-sqlite manifest honesty
host CR-1: createHost.getHostAPI() returns the canonical post-activation HostAPI
(registration closed) via a single builder — host-bin deletes its
buildPostActivationHostAPI duplicate and calls host.getHostAPI().
storage-sqlite CR-2: remove false contributes.services:["storage"] (backend is a
kernel bootstrap dep injected as HostDeps.storageFactory, not a bus service);
document the intentional no-op activate.
typecheck clean, 218 tests pass, biome clean; live boot + curl verified.
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- kernel HostAPI: add getAuthProviders()/getAuthProvider(id) read-views (mirrors getProviders)
- provider-openai-compat: activate() resolves creds via host.getAuthProvider("apikey").resolve(); dependsOn auth-apikey; model stays config-driven
- host-bin: mirror the new getters in post-activation HostAPI stub
- auth-apikey is no longer vestigial; auth seam exercised end-to-end
- 185 tests pass; typecheck + biome clean; verified live (curl returns real response)
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input tabId/turnId (CR-3); simplify orchestrator wiring (167 tests)
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activate, HostAPI (wraps bus); 50 tests
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