Garry Tan and Claude Opus 4.7
efa0313fd1
calibration: E8 team-brain sharing + D18 cross-brain query semantics (T14)
...
Cross-brain calibration profile resolution per the D18 4-rule contract.
Pins all four cross-brain leak surfaces in dedicated unit tests so future
mount features can't silently regress this security model.
D18 semantics (committed):
Rule 1 — LOCAL-FIRST ORDERING.
Query the local brain first. If a profile exists, return it. Do NOT
also query mounts (avoids stale-mount-overrides-fresh-local).
Verified: mountResolver is NOT called when local has a hit.
Rule 2 — MOUNT FALLBACK.
Only when local has no profile AND canReadMounts=true, walk the
mounts in priority order. First match wins. Each mount-side row
must have published=true to be visible (D15 asymmetric opt-in).
Rule 3 — CROSS-BRAIN ATTRIBUTION.
Every returned profile carries source_brain_id + from_mount flag.
Consumers (E1 think rewrite, E3 contradictions, E7 nudge, E6
dashboard) MUST surface this via attributionSuffix() so the user
sees which brain answered.
Rule 4 — SUBAGENT PROHIBITION.
canReadMountsForCtx() classifier returns FALSE for subagent loops
without trusted-workspace allowedSlugPrefixes. Closes the
OAuth-token-to-cross-brain-leak surface — subagents see ONLY their
local-brain results regardless of which holder they query.
Exception: trusted cycle phases (synthesize/patterns) pass
allowedSlugPrefixes set and ARE allowed to read mounts. Pinned in
the classifier test.
Architecture:
queryAcrossBrains(localEngine, opts) — pure orchestrator. Composes
getLatestProfile() from src/commands/calibration.ts. Mount engine
access is via opts.mountResolver — production wires this to the
v0.19+ gbrain mounts subsystem; tests inject a stub returning an
ordered list of mocked engines. Decouples cross-brain LOGIC from
multi-engine PLUMBING.
canReadMountsForCtx(ctx) — pure classifier table. Drives the rule-4
gate. Production callers compose it from OperationContext.
attributionSuffix(result) — pure formatter. Emits the "(from mounted
brain: <id>)" suffix when from_mount=true; empty string when local.
Mandatory for user-visible cross-brain consumers.
Tests: 15 cases pinned to the 4 D18 rules + 4 supplementary structural
checks.
D18-1: published=false profile on mount stays hidden.
D18-2/3: subagent context cannot fall back to mounts (2 cases — null
on local-empty + canReadMounts=false, local hit still returned).
D18-4: attribution surfaces source_brain_id (3 cases — mount answer
flag, local answer flag, attributionSuffix formatter).
Rule 1 local-first ordering (2 cases — mountResolver NOT called on
local hit, IS called on local empty).
Mount priority order (3 cases — first published=true wins, all
published=false returns null, no mounts configured returns null
without throwing).
canReadMountsForCtx classifier (4 cases — local CLI true, MCP
non-subagent true, subagent without trusted-workspace false,
subagent WITH trusted-workspace true).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com >
2026-05-17 16:45:07 -07:00
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