M5: Compaction-checkpoint fast path + budget voter#2
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June 18, 2026 23:19
Supersedes parent-design §3.3 (gateway forwarding tools). MCP becomes code the model runs in the sandbox; creds injected + per-call audit at the AuthBridge egress waypoint. Near-zero Pi surface; lean-both budget. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
…ssions Add §5: where secrets live (Keycloak + K8s Secret, broker-sidecar memory only); per-user scoping for unattended sessions via SPIFFE actor + bound subject + pre-authorized Keycloak delegation (RFC 8693 §4.1); placeholder swap; OpenShell env-cred complement; best-fit comparison of AuthBridge / OpenShell / DAM. New decisions D8-D10, consequences, and gate criterion 5. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
… HTTP APIs Generalizes M10's MCP-over-HTTP egress into a unified credentialed-egress path where MCP is one special case. Same AuthBridge waypoint, selector, audit producer, and budget machinery; per-destination credential resolver (RFC 8693 mint vs. per-user stored grant). Adds in-mesh front-door for external hosts (no baked CA), generic egress helper + committed GitHub wrapper, and records the per-user external-credential store + linking flow as an M7-M9 identity-plane dependency. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
Pivots the non-MCP egress mechanism from an in-mesh front-door + host-based injection (v1.0) to AuthBridge's own placeholder-swap pattern over a forward proxy (HTTPS_PROXY + baked CA). The sandbox/tools hold only inert placeholders; the proxy sees the request at L7 and overwrites with the real resolved credential. gh/curl/SDKs now work natively and unmodified; front-door + correctness-wrappers apparatus collapses; full per-call L7 audit preserved; more faithful to AuthBridge. Accepted cost: a baked CA (trust anchor, not a secret) and a narrow env-inject escape hatch for request-signing APIs (AWS SigV4). Selector and per-user stored-credential model unchanged from v1.0. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
Implements the pi-track plan's Milestone M4 (Tasks 13-14), re-targeted to the repo's real architecture: ride Pi's native compaction as the checkpoint, add SessionManager.openFromCheckpoint for O(tail) cold-start reconstruction, and a per-turn token budget voter. Repo milestone 5 (follows m4-knative). Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
Assigns each entry the Redis stream id "<position>-0" so read(fromPosition) is an XRANGE seek instead of a full-stream scan, and adds positionOfId for the M5 checkpoint marker. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
Pure decideBudget policy plus an extension that meters cumulative assistant token spend via ctx.sessionManager.getBranch(), blocks the tool call and appends a single abort entry once the per-turn delta breaches the cap. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
Appends a resume-pointer custom entry recording positionOf(firstKeptEntryId) so cold start can seek directly to the kept tail. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
Resume via the O(tail) openFromCheckpoint loader, always register the checkpoint-marker extension, and register the budget voter when SH_BUDGET_TOKENS is set. Adds the reconstruction parity gate. Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com> Signed-off-by: Paolo Dettori <paolo.dettori@example.com>
This was referenced Jul 9, 2026
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M5 — Compaction-Checkpoint Fast Path + Budget Voter
Implements the pi-track plan's M4 (repo milestone 5). Spec:
docs/specs/2026-06-23-m5-compaction-checkpoint-design.md. Plan:docs/superpowers/plans/2026-06-23-m5-compaction-checkpoint.md.Makes cold-start session reconstruction O(tail) by riding Pi's native compaction as the checkpoint, and adds a per-turn budget voter that blocks tool calls once a token cap is breached.
Changes
@sh/session-backend—RedisSessionBackendassigns each entry the Redis stream id"<position>-0", soread(fromPosition)is an O(tail)XRANGEseek instead of a full-stream scan + JS filter. NewpositionOfId;LogStoreinterface extended.SessionManager.openFromCheckpoint()+markerResumePositionhelper: reads only the checkpoint marker'sresumeFromPosition-forward slice, reuses the existingloadFromEntries/buildSessionContextpath, and falls back toopenFromBackendwhen there is no usable marker.openFromBackendis untouched.harness/src/checkpoint-extension.ts— onsession_compact, appends a tinycustom/checkpointmarker recordingpositionOf(firstKeptEntryId).harness/src/budget-voter.ts— puredecideBudget,sessionSpendTotal, andbudgetVoterExtension. Gated by envSH_BUDGET_TOKENS(+ optionalSH_BUDGET_MARGIN); unset ⇒ inert.harness/src/run-turn.ts— resumes viaopenFromCheckpoint; always registers the checkpoint extension; registers the budget voter whenSH_BUDGET_TOKENSis a finite value > 0.Submodule
This PR bumps the
pi-forksubmodule pointer to branchfeat/m5-openfromcheckpointonkagenti/pi(additiveopenFromCheckpointloader + a caveat doc comment). No upstream PR.Verification (no LLM key required)
@sh/session-backend10/10, all against real Redis.openFromCheckpoint(...).buildSessionContext()deep-equalsopenFromBackend(...)after a real compaction; slice read is strictly smaller than the full log.tsgo) passes; targeted session-manager regression tests green.harness/test/run-turn.test.tsis LLM-gated and excluded.Known caveat (documented + test-locked)
Tail-load drops the session-start
thinking_level_changeentry (it precedesfirstKeptEntryId), sothinkingLevelreconstructs to the settings default on the first post-compaction resume; it self-heals on the next turn and is harmless while thinking level is settings-governed.modelis unaffected (re-set by every assistant message, always in the kept tail). A test incheckpoint.test.tslocks this behavior.Deferred (out of scope)
everyK/forced-checkpoint cadence; cross-turn cumulative budget ledger.Assisted-By: Claude (Anthropic AI) noreply@anthropic.com