FACTUAL ACTIVITY RECORD · An activity record based on work that took place
(Not applied) Stopping an overcomplicated session-reference helper
Testing a reference path that preserved safety constraints, then cancelling an implementation that became too heavy for its purpose
Purpose
A way was needed to pass only the necessary conversation from an explicitly identified session to a downstream contributor while preserving the safety boundary that prevented direct Computer Use access to the Codex app.
The proposal was a dedicated helper that stayed target-limited and read-only, exposed neither secrets nor unrelated conversations, and reproduced the same extraction from the same input.
Implementation
The initial design looked up only an explicitly supplied exact session ID in the state database and opened the active target session record read-only. Directory discovery, raw transcript output, permission relaxation, and alternate-UI bypasses were prohibited; schema, path, symbolic-link, or file-identity mismatches failed closed.
To handle an unknown ID, the scope expanded to metadata-only discovery by parent title and direct spawn relation, a search requiring every supplied literal anchor, and relation-first discovery that matched direct relationships and the workspace without using titles. Modes did not fall back automatically: discovery stopped after returning a private candidate packet, and content could not be opened before exact-ID confirmation.
For extraction, metadata, hashes, records, and before-and-after identity were produced from the same O_NOFOLLOW descriptor, while request files required canonical containment and rejection of symlinks in every parent. Artifact, line, record, and standard-output limits were added, and a secret-like match stopped without returning an excerpt.
- Replace reopen-based processing that could not guarantee one snapshot with streaming from a single descriptor.
- Treat both underscore and hyphen forms of secret-like values as stop conditions.
- Reject outside-workspace paths, credential-like paths, parent symlinks, and replacement during reading.
- Add home-path and email redaction and derive the reported test count from executed fixtures.
Verification showed that no positive extraction from the real session had been reproduced: a zero-match result could not demonstrate the ability to hand off an allowed message. The implementation also lacked a guarantee that cumulative bytes would stop at the limit when the same file was appended during streaming.
As exact reference expanded into multiple discovery modes, confirmation, snapshot consistency, redaction, and limit management, the search and implementation became too complex for the original objective. The result was not applied, and the workstream was terminated.
- Codex session参照の変更では、session reference helperがcanonical lowercase UUIDv7だけを受け付け、CLI path / DB上書き、directory scan、archived / 別session、raw transcript、Computer Use / 別UI fallbackを拒否しているか
- state DBがread-only + `query_only`のexact active lookupで、schema / row count / root-date-basename / metadata ID / symlink / descriptor identity mismatchをfail-closedにするか。metadata、hash、records、before / after statが同一`O_NOFOLLOW` descriptorのsingle streaming snapshotから生成され、再openしていないか
- request fileがcanonical repository containment、全parent symlink、credential-like name、descriptor-based readとread-time identityを検証するか。`sk_` / `rk_`と`sk-` / `rk-`を含むsecret-like matchでexcerptを出さず、一般absolute home path / email redaction、record / output上限、fixture-only read-only / concurrent-mutation / request TOCTOU coverageがあるかRendering diagram…
What was confirmed
Verification results
Fixtures confirmed boundaries for read-only lookup, identity, symlink, path and secret rejection, and bounded output.
Identity verification against the real session succeeded, but a positive handoff containing at least one allowed message was not demonstrated.
The cumulative-byte limit under concurrent append also remained unresolved, so the current exact state did not receive an explicit completion finding.
At the cutoff, cancellation was confirmed because the solution had become too complex for its purpose, and the helper, policy, and documentation changes were not applied to the target.
Basis for completion
The outcome was complete when the safety boundaries and verification gaps were made concrete, the missing positive handoff and cumulative-limit guarantees and excessive implementation complexity were confirmed, and a decision was made to end the workstream without applying its result.