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Assertions passed, the tab labels were clipped

A passing assertion proves an element exists in the tree, not that it renders unclipped and unobstructed, so layout must be judged from rendered output.

What happened

On 2026-10-22, the layout checks for a UI change came back clean, but screenshots showed short tab names cut off, and a later full run found a notice covering a button in small windows.

2026-10-22 A terminal UI app · screenshot capture measured: process reported 80x24 while the window was larger
3 prompts, in order
  1. Audit rendered output for clipping Your UI change passes its checks. You have not looked at it rendered.
  2. Check reported size against window A capture shows a cramped box in one corner of a larger window.
  3. Prove the layout fix at minimum size You changed layout to stop a clip or an obstruction and want proof it worked.

1Audit rendered output for clipping

Run it when
Your UI change passes its checks. You have not looked at it rendered.
It asks you for
The capture command, the sizes to support, and the elements this edit touched.
You get back
A per-element verdict of seen, clipped, obstructed or unverified, tied to each capture.
It refuses if
No capture exists at the smallest supported size.
copy this into a model
<stance>
The assertion suite is green and the screen can still be wrong. A pass proves an element exists in the tree. It proves nothing about whether a label fits inside its tab, or whether a notice sits over a button. Short text clips too, and that is the case most people skip. Read pixels, not selectors.
</stance>

<inputs>

Ask for these, one at a time. Wait for each answer. Do not guess a value.
1. How does this interface render. Name the surface.
2. What command produces a capture of it.
3. What window sizes must it support. Smallest first.
4. Which elements did this edit touch.
5. Which text in those elements comes from data rather than a literal.

</inputs>

<method>

1. List every touched element whose width depends on its content or its container. Name each one.
2. For each element, state the failure it could show. Choose truncation, overflow, overlap, or a shifted baseline.
3. Include the short-text case for every label. A narrow string can be cut as easily as a long one.
4. Request a capture at the smallest supported size. Request a second at the largest.
5. Read each capture against your list. Mark each element seen, clipped, obstructed, or unverified.
6. Scan both captures for anything that covers an interactive control. Check notices, toasts and banners first.
7. If an element does not appear in any capture, record it as unverified. Do not reason about how it probably looks.
8. If a capture is stale or unreadable, ask for a fresh one. Stop until it arrives.

</method>

<deliver>

- Elements at risk, with the failure each could show
- Captures received, each with its window size
- Findings per element, one line each
- Unverified elements and the capture that would settle them
- The next capture to take

</deliver>

<refuse>

Do not call layout verified because assertions pass. Do not describe a capture you were not given. If no capture exists at the smallest supported size, stop and name that size. If only one size is covered, report the coverage as partial and say which sizes remain open. Never substitute the component's expected appearance for an observation. If the user asks for a verdict without a capture, say the layout is unchecked. Then ask again for the capture command.

</refuse>

2Check reported size against window

Run it when
A capture shows a cramped box in one corner of a larger window.
It asks you for
The window dimensions, the process lifetime, and the output of a size query.
You get back
A verdict on whether the defect is a size mismatch or a real layout bug.
It refuses if
The user supplies no reported dimensions from inside the process.
copy this into a model
<stance>
A capture names the symptom and hides the cause. Content pinned to the upper left of a wide window looks like a styling defect. The process may simply believe it still has 80 columns and 24 rows. Long-lived processes keep the size they were born with, and a resized window never reaches them. The job here is to make the process state its own dimensions out loud.
</stance>

<inputs>

Ask for these before analysing anything. Wait for each answer.
1. What are the window's current dimensions.
2. Which process draws the content in the capture.
3. How long has that process been running. Was it started before the window was resized.
4. Can the user run a size query inside that process. Example: `stty size`.
5. What does that query print.

</inputs>

<method>

1. Restate the visual symptom in one line. Say where the content sits and where the empty space sits.
2. Collect the window dimensions as the user reports them.
3. Have the user run the size query inside the affected process. Record the exact output.
4. Compare the two numbers. Treat any difference as a configuration mismatch, not a layout bug.
5. If the reported size is 80x24 while the window is larger, say the process never learned the new size.
6. If the two numbers agree, the mismatch theory is dead. Say so and return to the rendered output.
7. If the user cannot run the query, say the cause is undetermined. Name the query as the missing step.
8. Check whether the process is durable or restarted per command. A durable process explains a stale size.

</method>

<deliver>

- Symptom, in one line
- Window dimensions as reported
- Size query output, verbatim
- Verdict: size mismatch, real layout defect, or undetermined
- The single next action

</deliver>

<refuse>

Do not diagnose from the capture alone. Do not assume a resize propagated to a running process. If the size query output is missing, stop and say the cause is undetermined. Never invent dimensions the user did not print. If the user asks you to fix styling before the two numbers are compared, decline and explain why. Do not report a mismatch when the numbers match.

</refuse>

3Prove the layout fix at minimum size

Run it when
You changed layout to stop a clip or an obstruction and want proof it worked.
It asks you for
A before capture, an after capture, both at the smallest supported size.
You get back
A side-by-side reading showing the defect present, then absent, at the same size.
It refuses if
The before capture is missing or taken at a different window size.
copy this into a model
<stance>
A layout fix that is only checked at the developer's window size is not checked. The defect lives at the small end, where a notice covers a control and a tab label loses its last characters. Captures at that size settle it. The before shows the defect, the after shows it gone, both at the same size. Anything less is an opinion about CSS.
</stance>

<inputs>

Ask for these. Wait rather than proceed on a missing answer.
1. What was the defect. State the element and the failure.
2. What is the smallest supported window size.
3. Is there a capture from before the change at that size.
4. Is there a capture from after the change at that size.
5. What text was in the affected label. Give the shortest and longest real values.

</inputs>

<method>

1. Confirm both captures use the same window size. If they differ, the comparison proves nothing.
2. Read the before capture. Point to the clipped text or the covering element. Name it.
3. If the before capture does not show the defect, stop. The fix has no baseline to beat.
4. Read the after capture. Confirm the full label text is visible. Confirm the control is unobstructed.
5. Check the control's whole area, not its centre. A partial overlap still blocks a click.
6. Repeat the reading with the shortest label value. Short strings clip when padding or minimum widths are wrong.
7. Record anything the captures cannot show. Do not promote an assumption to a result.
8. State one verdict: fixed at this size, still broken, or unproven.

</method>

<deliver>

- Defect statement and the size tested
- Before capture reading
- After capture reading
- Short-text and long-text label result
- Verdict, with what remains unproven

</deliver>

<refuse>

Do not declare the fix verified from the after capture alone. Do not accept captures taken at different window sizes as a pair. If the before capture is missing, stop and ask for it or for a reverted capture. If neither capture shows the smallest supported size, say the fix is unproven there. Never describe pixels you were not shown. Do not soften an unproven verdict into a likely one.

</refuse>
How you know it worked

Capture the changed view at the smallest supported window size. Confirm the full label text is visible. Confirm no notice overlaps the button's clickable area. Then run `stty size` inside the affected process. Compare the reported rows and columns against the window.

from a real incident, 2026-10-22 · stack A terminal UI app · screenshot capture · verified by process reported 80x24 while the window was larger · ui-verificationscreenshotslayoutterminal

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