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subagent: seed inherited policy events at creation

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The parent implementation introduced sandboxMode and approvalPolicy as generic SessionHeader fields, then propagated those fields through both persistence backends, session-query indexes, collision checks, policy-specific seed-boundary folds, catalogs, and a broad test matrix. That storage plane is unnecessary: Session already accepts a validated constructor seed, and persistence captures that seed when the session is announced before committing its first batch.

Capture each parent override synchronously at delegation, append source-tagged sandbox/mode and approval/policy records after the optional fork prefix, and create the child with that combined seed. Keeping header.seedLength at the original fork-prefix length preserves lineage while ordinary last-event-wins folds make the inherited records outrank stale parent history and remain subordinate to later child switches. Unswitched parents still stamp nothing, so children continue to follow deployment defaults.

Remove the generic header fields and every persistence/query/schema branch built around them. Collapse the inheritance suite from ten leaking scenarios to four owned-context cases covering real filesystem confinement, stale fork precedence, delegation-time capture, and the no-override path. The assembled headless snapshot now asserts the persisted inheritance event directly.

This keeps the security behavior while restoring policy ownership to the existing event log and deleting the speculative durability machinery that the original tests did not exercise.
This commit is contained in:
Tianyi Cui
2026-07-28 21:31:17 +08:00
parent afa38c4b2f
commit cfceb8452b
55 changed files with 415 additions and 1371 deletions
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6
packages/session-query/session-query-sqlite/src/schema.ts
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@@ -5,7 +5,7 @@ import { mkdir, open } from 'node:fs/promises'
import { dirname, resolve } from 'node:path'
/** Current derived-index schema version. Incompatible versions reset in place. */
export const SESSION_QUERY_SQLITE_SCHEMA_VERSION = 6
export const SESSION_QUERY_SQLITE_SCHEMA_VERSION = 5
/** SQLite application id protecting unrelated databases from derived resets. */
export const SESSION_QUERY_SQLITE_APPLICATION_ID = 0x44534851
@@ -117,8 +117,6 @@ function ensurePersistentSchema(db: DatabaseSync): void {
parent_session TEXT,
seed_length INTEGER,
delegation_depth INTEGER,
sandbox_mode TEXT,
approval_policy TEXT,
revision TEXT NOT NULL,
generation INTEGER NOT NULL
) STRICT
@@ -148,8 +146,6 @@ function ensureTemporarySchema(db: DatabaseSync): void {
parent_session TEXT,
seed_length INTEGER,
delegation_depth INTEGER,
sandbox_mode TEXT,
approval_policy TEXT,
fingerprint TEXT NOT NULL,
persisted INTEGER NOT NULL CHECK (persisted IN (0, 1)),
generation INTEGER NOT NULL