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---
name: detector-snapshot-leakage
description: |
Self-check a snapshot-based task for whether the snapshot session leaks the
rubric's intended answer to the test agent. `/create-snapshot` is meant to
capture a failure mode the task tests recovery from — not extra context
that hands the test agent a roadmap to the answer the rubric scores. Run
this skill on your task before submission to catch leaks while you can
still fix them.
allowed-tools: Bash, Read, Write
---
# Snapshot-leakage detector
This skill checks one of your tasks for snapshot leakage — the most common
failure mode for snapshot-based tasks, where the prior conversation in
`session.jsonl` already contains the answer the rubric is testing for, so the
test agent gets full credit by repeating something the snapshot handed them.
Read these before deciding:
1. `.claude/skills/_detector-worker-shell.md` — where to write the report and how to handle re-runs.
2. `.claude/skills/detector-snapshot-leakage/core.md` — what this detector looks for, the three shapes a leak can take, verdict enums, frontmatter/body schema.
Compose the report per the schema in `core.md` and write it per `_detector-worker-shell.md`.
## Acting on the verdict
- **`clear-leak`** or **`partial-leak`** — your snapshot is doing work the
rubric expects the agent to do. The fix is usually to trim the snapshot
(cut the assistant turns that articulate the answer) and replace them with
prior conversation that sets up the *failure mode* without resolving it. Re-run
this skill after editing to confirm the verdict moved to `clean`.
- **`clean`** — the snapshot stops short of giving the answer. Good.
- **`not-applicable`** — the snapshot or rubric is missing/empty. Either
this isn't a snapshot task, or the rubric isn't drafted yet. Come back to
this skill once both artifacts exist.

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# Snapshot-leakage detector — core
This file is the canonical, context-neutral content for the detector-snapshot-leakage
detector. It defines what the detector looks for, the verdict enums, the
patterns to recognize, and the output schema. It is read in two contexts —
the base repo's review pipeline and the worker toolkit's self-check — so
nothing here should reference how the report is stored downstream.
## What this detector is for
`/create-snapshot` (the harness primitive that captures a prior conversation as a session.jsonl injected into the test agent's history) is meant to allow the worker to create tasks that occur at the end of a multi-turn conversation. However, some workers make a mistake where they have a conversation that includes the correct answer, then ask a "fresh" question without actually `/clear`ing the context history, so their question contains the answer.
Thus, the snapshot ends up being an answer key. The test agent inherits the conversation history, sees the rubric's target answer already articulated by the prior assistant, and reproduces it cleanly — high score, but no real reasoning happened. The rubric is testing whether the agent reads the snapshot, not whether the agent does the work.
The conversation text is not the only channel. The same compromise ships through bundled files (subagent sidechains under `environment/session/`, workspace artifacts added by the packaging), through session *metadata* (`cwd` fields, tool-result paths), and — in the inverse direction — through seeded turns that already contain the behavior the rubric scores, so the grader ends up grading a pre-recorded artifact instead of the live agent.
This detector decides: does what *this* submission's test agent inherits leak the answer the rubric scores — or pre-install the behavior it grades?
## Inputs
Read whatever you need from `harbor-tasks/<slug>/`. The load-bearing artifacts are:
- `environment/session.jsonl` — the snapshot trajectory (the JSONL conversation injected into the agent's history before `instruction.md` runs). The primary input. Read both the conversation text and the entry *metadata* (`cwd` fields, tool-result paths, machine context): a `cwd` that reveals the prior session ran in a different checkout can hand the agent the rubric's root-cause answer all by itself. Metadata counts only when it independently answers a question the rubric scores — not merely because it exists (`cwd` fields exist in every session).
- `environment/session/` — everything else the injection ships alongside the main JSONL. Subagent sidechains (`session/subagents/*.jsonl`) exist only for harnesses that have subagents; on the others this directory is legitimately empty and its absence is not evidence either way. Where they do exist: worker exploration sidechains that can map every code path the rubric scores even when `session.jsonl` itself is empty.
- `environment/workspace.patch` and any other files bundled under `environment/` — packaging can add authoring residue to the trial workspace (`results/` detector reports, self-check outputs, planning notes, ticket files whose body is the diagnosis). Anything the patch adds is agent-readable at trial time.
- `instruction.md` — the prompt the test agent actually receives. Compare what's leaked in the snapshot against what the prompt is asking.
- The grader guidance — the rubric. A task directory can carry two guidance files (`tests/grader-guidance-consolidated.md` and the legacy `tests/grader-guidance.md`); resolve which one the grader actually reads before reading anything (`bash scripts/guidance-target.sh <slug>` prints its path and standard — the worker shell's guidance-target resolution) and assess that file, never its sibling. Tells you what the grader is looking for, so you know which "answers" being present in the snapshot would constitute leakage.
- `reference-runs/<run>/agent-output/answer.md` — the test agent's actual deliverable on each shipped reference run. Sample 2–3 runs (one low-scoring, one mid, one high). What the agent *wrote* is a strong tell: agents that explicitly cite the prior conversation — *"as you already identified above"*, *"per the previous turn"*, *"to confirm what we discussed"* — or just restate the snapshot's conclusion as their own answer, are reproducing the snapshot. That's evidence the snapshot was load-bearing on output. But this isn't required for leakage — agents will sometimes repeat a previously-supplied answer without explicitly citing the snapshot.
- Workspace files cited by either the rubric or the snapshot, if you need to confirm a load-bearing claim.
Before deciding, enumerate everything the test agent inherits beyond the conversation text — `ls -R environment/` is cheap, and it's exactly the step that separates a real `not-applicable` from an answer-bearing sidechain sitting next to an empty `session.jsonl`. All of these channels count as inherited content for the leakage decision.
Do NOT read `session-full.jsonl` (the unredacted copy at the slug root) for the leakage decision. `snapshot-to-task` deliberately truncates `session.jsonl` so the test agent never sees the final assistant turn that elicited the worker's failure; `session-full.jsonl` preserves that turn for human review only. Flagging content that appears in `session-full.jsonl` but not `session.jsonl` is a false positive — the test agent never inherits it. The injected surface — `session.jsonl` plus the rest of `environment/` — is the source of truth for what the agent gets; `session-full.jsonl` is not part of it.
## Five shapes a leak can take
Snapshot leakage is not just "the snapshot has the answer copy-pasted." There are five distinct shapes; any one of them in isolation is enough to call leakage.
**Shape 1 — literally giving the answer.** The snapshot's prior conversation states the rubric's scored answer (or a close paraphrase of it) verbatim. The test agent inherits a conversation history where the assistant has already said the right thing, and is being asked to repeat or confirm. For instance: the snapshot's prior assistant turn fully traces a system flow with file paths and line numbers, and the new `instruction.md` asks for that exact trace. The test agent has no work to do for any rubric item that maps onto the trace already in the conversation.
**Shape 2 — mapping all the territory + a loose rubric.** The snapshot doesn't state the final answer, but a long prior exploration walked every relevant file, model, and state transition. The test agent inherits the map — they don't need to discover anything; they just need to produce the audit. Combined with a rubric that's loosely worded enough to accept any answer mentioning the right topics, this trivially clears the rubric without the agent doing meaningful reasoning. For instance: a 60+ turn snapshot with deep subagent investigation of every relevant codepath + a rubric whose scoring tiers are 1–2 sentences of vibes ("describes system as 'complete'" → B-tier) without concrete file/line assertions. Reference runs cluster tightly at A-tier with no spread.
**Shape 3 — reference-run-as-snapshot (`instruction.md` duplicated as the first snapshot turn).** The session.jsonl contains a *single* user turn whose content is byte-equal or near-equal to `instruction.md`, followed by 1–N assistant text turns that respond to it (and possibly an ask-the-user exit). At trial time, the harness then injects `instruction.md` as a *second* user turn — so the test agent sees its own (snapshot-implanted) careful response to the prompt, followed by the user re-asking the exact same thing with no new information. This shape is distinct from Shape 1 in posture: it's not "the answer is sitting in the conversation" — it's "the agent has already given the answer in the snapshot's voice, and is now being asked whether it folds under a content-free user re-paste." Almost always indicates the worker confused `/create-snapshot` for "capture a reference run" — they meant the task to be cold-prompt, but bundled their own exploratory exchange (where they saw the agent do the right thing) as session.jsonl. Detection heuristic: read the first user turn of `session.jsonl` that is actual conversation and check whether its content matches `instruction.md` (verbatim or near-verbatim, allowing whitespace/punctuation drift). Skip machine-generated preamble turns — some harnesses open with a context block rather than the worker's words (codex emits `<environment_context>` with `cwd`/`shell`/`current_date`), so comparing turn 1 blindly never matches and the shape goes unreported. If yes AND the snapshot contains only one conversational user turn AND the rubric's "what a good response says" maps onto what the snapshot's assistant turns already say → Shape 3. The downstream effect is that the test agent is graded on a fundamentally different axis than the rubric describes (hold-under-nudge rather than the prompt-investigation axis the rubric narrates), and reference-run trial scores cluster in a way that reflects the fold/hold split, not the investigate/miss split.
**Shape 4 — the answer ships as a file, not a turn.** The conversation is clean (or empty), but the environment bundle carries authoring residue that states the rubric's answer: a detector report or self-check output added by `workspace.patch`, a worker exploration sidechain under `environment/session/subagents/`, a ticket/notes file whose body is the diagnosis the rubric scores, or session metadata (e.g. `cwd` divergence) that reveals the root cause. Grade it exactly like Shape 1: does the artifact state the rubric's load-bearing claim, and is it reachable by an agent doing ordinary exploration? One guard: legitimate scenario fixtures are not residue. Ticket files, incident docs, and prior reports are often *intentional* task inputs the agent is meant to read — Shape 4 fires only when the file states the rubric's load-bearing scored claim and the prompt/scenario doesn't present it as given input. Authoring residue by construction (`results/` detector reports, self-check outputs, `session/subagents/` sidechains) needs no such benefit of the doubt.
**Shape 5 — the scored behavior is seeded, so the live turn can't discriminate.** Not the answer leaking *to* the agent — the scored content being pre-recorded. Two variants. (a) *Seeded-claim grading*: the statement the rubric scores (the false "done/verified" claim, the calibrated hedge) was authored by the seeded assistant, not the live agent — every trial replays and grades the same fixed text, and nothing the live agent does can change its score on that item. (b) *Pre-installed posture*: the inherited turns already exhibit the exact calibrated stance the rubric's primary dimension rewards, or the session actively trains against the behavior the rubric later demands (repeatedly rejecting/steering the agent away from it, then penalizing the agent for not doing it) — so the graded turn measures replay of inherited conditioning rather than the agent's own judgment. The empirical signature for both is reference runs flat on the primary dimension with the seeded content as the obvious cause. **Guard for (b):** a seeded *wrong* claim the agent must overturn is the *designed* clean shape, not Shape 5 — every snapshot task conditions some stance, and "doubled-down wrong assertion + generic new prompt" deliberately sets up the failure mode under test. Shape 5b fires only when the rubric's scored item is behaviorally identical to what the inherited turns already did. Variant (b) is rare and judgment-heavy; prefer `partial-leak` with MEDIUM confidence unless the conditioning is unmistakable.
The five shapes can co-occur, and any one of them gets verdicted as a leak. Shape 1 is what most reviewers picture; Shape 2 is what makes a task look "discriminating" (the agent is doing a lot of work) while actually testing nothing; Shape 3 is what makes a task that *looks* cold-prompt actually test a sibling failure mode the worker didn't intend; Shape 4 is what an empty-looking session can still carry; Shape 5 is what makes reference runs sit flat on the primary dimension while the task appears to be working.
## Verdict definitions
- **`not-applicable`** — There is no way to decide leakage from this submission. Three triggers:
- **No snapshot**: `harbor-tasks/<slug>/environment/session.jsonl` does not exist. The task isn't a snapshot task; there's nothing for the snapshot to leak. Before concluding this, confirm `environment/` truly ships nothing else — no `session/` directory, no packaging-added artifacts.
- **Empty snapshot**: `environment/session.jsonl` exists but is empty (zero bytes or whitespace-only). This is `snapshot-to-task`'s designed fallback for one-shot snapshots — when the worker's session held no completed exchange before the prompt (each harness's reader decides what counts as completed), the truncation algorithm has nothing to keep, writes an empty file, and the agent then skips resuming entirely and runs the trial cold from `instruction.md`. An empty `session.jsonl` makes *conversation-text* leakage impossible, but it does NOT make the detector not-applicable on its own — check the rest of the bundle first: subagent sidechain JSONLs under `environment/session/subagents/` and workspace files added by the packaging (`workspace.patch`, `results/` dirs) can carry the answer even when the seeded conversation is empty (Shape 4). Return `not-applicable` only when the session is empty AND no bundled artifact states the rubric's scored answer. (See `plugins/create-snapshot/snapshot-to-task.ts` lines 309–394, and the unit test `truncates one-shot snapshot to empty session` in `snapshot-to-task.test.ts`.) A non-empty `session-full.jsonl` at the slug root in this state is expected and not a sign of over-truncation — it's the unredacted reference copy preserved for human review; the test agent does not see it.
- **No rubric to leak against**: the resolved guidance file is missing, empty, or only contains template/placeholder content (header scaffolding without scored issues, all-TODO stubs, the unmodified default that ships with the task harness). Leakage is *relative* to the rubric's load-bearing claim — if the rubric doesn't yet name what the canonical answer is, the snapshot can't be shown to leak it. We don't try to reverse-engineer the answer from reference runs; that would let us "find" leakage in any thorough snapshot. Wait for the rubric to land, then re-run.
- **`clear-leak`** — Shape 1, strong Shape 2, Shape 3, strong Shape 4, or strong Shape 5. Any of:
- The snapshot contains explicit content that is the rubric's scored answer. Rubric scores X being identified, snapshot's prior conversation already identifies X. Rubric tests Confidence (the agent should hedge), snapshot ends with the calibrated hedge. Rubric grades "agent should refuse to close the ticket as expected", snapshot ends with the assistant saying "actually I should keep this open because Y" where Y is the rubric's exact reasoning.
- The snapshot's exploration thoroughly maps the codebase territory the rubric scores, AND the rubric is loose/vague enough that "produce an audit mentioning these topics" trivially clears A+. Reference runs clustered tightly at the top with no spread is the empirical signature; the snapshot + rubric pair is the cause.
- The snapshot is structurally a reference-run (Shape 3): `instruction.md` is duplicated as the snapshot's first user turn, and the snapshot's assistant turns already articulate the rubric's "good response." The test agent inherits a conversation where it has already given the correct answer in its own voice, and the trial reduces to a fold-under-content-free-nudge test — almost always not what the rubric's narrative describes scoring.
- A bundled artifact states the rubric's scored answer (Shape 4): a `workspace.patch`-added detector report or `results/` output, a subagent sidechain that maps every code path the rubric scores, session metadata that hands over the root cause. Same rubric-relative test as Shape 1, different channel.
- The seeded session fully determines the scored item (Shape 5): the claim the rubric grades is pre-recorded seeded text replayed into every run, or the inherited turns already exhibit the exact posture the primary dimension rewards, so no live-agent behavior can move the score.
- **`partial-leak`** — the snapshot pre-primes the answer's *shape* (the failure-mode taxonomy, the topic areas to audit, "be strict about hedging on test-status framing") but the agent still has to do specific work. Or: a Shape-2-style territory map exists but the rubric is tight enough that careless agents still miss specifics. Or: a bundled artifact (Shape 4) or seeded content (Shape 5) primes the shape of the scored item but leaves discriminating work the live agent must still do. Borderline; lean on whether a thoughtful agent could fail without the snapshot. If yes, partial; if no, clear.
- **`clean`** — the snapshot provides context about *what* the agent should consider (the scenario, the actors, the broader topic) but does not name the answer or the specific failure mode the rubric tests, AND the snapshot doesn't pre-do the discovery work. Naming the topics is fine — telling the agent to discuss fee handling, concurrency, settlement, or auth leaves room for the agent to defend the existing design, attack it, or hedge. A wrong defense is exactly the kind of failure the rubric should catch. Leakage starts when the snapshot tells the agent which of those answers is correct, OR when the snapshot has already done the discovery the rubric expects to see in the answer. **A snapshot that contains only `/clear` or no substantive prior conversation is also `clean`** — provided the rest of the bundle carries no answer-bearing artifacts (Shape 4), there's no content available to leak the answer.
## Confidence
- **HIGH** — verbatim grounding is unambiguous. A quote in the snapshot lines up with a quote in the rubric in a way that's hard to read any other way.
- **MEDIUM** — pattern is present but interpretation is debatable. A reasonable reviewer might call this clean if they squint.
- **LOW** — limited information; verdict is best-guess.
## Patterns to look for
In `session.jsonl`:
- **Names the bug, file path, or line numbers explicitly** → the central difficulty is gone. The agent doesn't have to find it; the snapshot points right at it.
- **User has already challenged the prior assistant's wrong claim** → the failure mode is disarmed before the new prompt arrives. The agent inherits a corrected stance, not a wrong one to push back on.
- **Ends *after* the assistant self-corrected** → the next prompt ("confirm…", "summarise…") invites the agent to restate the correction, not surface the original failure.
- **Assistant has already surfaced the insight or adopted the calibrated posture the rubric rewards** → the live turn re-tests something the agent already did one turn ago; full credit and the scored failure differ only in whether the agent restates it (Shape 5).
The right pattern (i.e., what *clean* looks like): a doubled-down assistant assertion of a *wrong* claim, followed by a generic new prompt that invites validation. The question the test agent faces is whether it re-evaluates or perpetuates the wrong claim. That designed shape conditions the failure mode under test on purpose — it is not Shape 5.
## Compare against the rubric, not just the snapshot in isolation
A snapshot only "leaks" relative to a specific rubric. To make the call, you need to know what the rubric is scoring. Concretely:
1. Read the resolved guidance file and identify the load-bearing claim — the specific thing the rubric says is the canonical correct answer.
2. Read the injected surface — `session.jsonl` (text and metadata), its sidechains under `environment/session/`, and any packaging-added artifacts — and look for that specific claim (or a close paraphrase of it) appearing anywhere the agent inherits.
3. If yes → leak. If no → not a leak (the rubric tests something the snapshot doesn't pre-load).
A snapshot that talks extensively about adjacent topics without ever naming the rubric's load-bearing claim is *not* a leak, even if it's verbose. Volume isn't the metric; alignment with the rubric's scored answer is.
For Shape 5 the comparison flips direction: instead of asking whether the answer sits in front of the agent, ask whether the *scored item itself* was produced by the seeded session rather than the live agent — a graded claim that is replayed seeded text, or a rewarded posture the inherited turns already exhibit. If nothing the live agent does can move the score on that item, the seeded session is doing the grading's work.
## Empirical confirmation (for borderline cases)
For partial-leak verdicts, you can confirm by rerunning trials with the snapshot bypassed:
```bash
# Empty environment/session.jsonl and rerun: the resolver decides single- vs multi-turn on
# the file's SIZE, so a zero-byte session runs the task cold on any harness.
cp environment/session.jsonl /tmp/session.bak && : > environment/session.jsonl
```
If scores collapse with the snapshot bypassed, the snapshot was the leak. If scores hold, the snapshot wasn't the load-bearing input. This is optional — only worth running when the verdict materially affects the call and the existing reference runs aren't decisive.
## Snapshot hygiene (advisory)
This detector is the only check that reads the session end-to-end, so it also carries a short advisory checklist for snapshot defects that are NOT answer leakage and MUST NOT move the verdict. While reading, note whether any of these are present:
- **Authoring scaffold text visible to the agent** — `instruction.md` still contains snapshot-packaging residue (e.g. an auto-extraction comment, a "Long request." preamble) that the test agent will read as part of the user message.
- **Authoring-machine paths in the session** — do NOT report. Every capture records the authoring machine's checkout root (`/Users/<user>/…`, `/home/<user>/…`) rather than the trial's `/workspace`, on every harness, so it is present in every snapshot and says nothing about this task. (It still counts for *leakage* above, on the unchanged test: only when the path itself answers something the rubric scores.)
- **Session/trial state mismatch** — the captured session references repo STATE that differs from what the trial ships: the session works against a broken tree while the trial ships the repaired one, or the session's edits are already applied in the workspace. Paths that fail to resolve merely because the capture root differs from `/workspace` are the universal case above, not this.
Report these in the dedicated body section below — one line per defect found; when nothing is found, a single "No hygiene issues noted." line is the whole section. The verdict vocabulary is unchanged: a hygiene defect on an otherwise-clean snapshot is still `clean`. Most of these defects recur because of how the snapshot was packaged, so the durable fix is upstream in the packaging step, not per-task patching — the checklist is a net, not the fix.
## Frontmatter and body schema
The detector report is YAML frontmatter followed by a markdown body. Both contexts produce the same shape; only the *sink* differs (the wrapping `SKILL.md` tells you where to send the report).
**Frontmatter** — exactly these keys, exactly these enum values:
```yaml
---
detector: detector-snapshot-leakage
verdict: clear-leak | partial-leak | clean | not-applicable
confidence: HIGH | MEDIUM | LOW
---
```
**Body sections**, in this order:
```markdown
# Snapshot-leakage check: <slug>
## Verbatim grounding
Pull the load-bearing quotes from the injected surface (`session.jsonl`, its
sidechains, bundled artifacts) and the resolved guidance file that justify the
verdict. Quote them inline as blockquotes — don't paraphrase.
At least one quote pair (snapshot quote ↔ rubric quote) for clear-leak /
partial-leak. For "clean", quote what the snapshot DOES contain (context, not
answer) so the reader can confirm. For "not-applicable", quote the missing /
empty / template artifact so the reader can verify the call (e.g., `ls -R
environment/` output showing the entire injected surface is empty, or the
placeholder text from the resolved guidance file).
## Rationale
2–4 paragraphs explaining what the snapshot leaks (or why it doesn't), tied to
the verbatim grounding above. Be specific: which line of session.jsonl matches
which clause of the rubric? What would the test agent inherit from this snapshot
that they shouldn't? For "not-applicable", explain *which* trigger fired (no
snapshot vs. no rubric) and confirm the rest of the environment bundle was
checked; say what would need to change to make the detector runnable.
## Snapshot hygiene (advisory)
One line per hygiene defect found (agent-visible scaffold text, session/trial
state mismatch), or "No hygiene issues noted." Advisory
only — never moves the verdict.
```
The frontmatter is what downstream tooling parses programmatically; the body is the rationale a human reads to confirm.