fix(tui): truncate collapsed generic tool summaries - #60363

Issue for this PR

Fixes #48783

Note: #48783 is assigned to @simonklee.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Root cause: GenericTool renders its collapsed summary through genericToolSummary and primitiveInputSummary, which concatenated every primitive argument as key=${String(value)} without eliding long values or bounding the total display width. Calling any plugin or MCP tool with a multi-kilobyte string argument dumped the entire string into the collapsed transcript row, soft-wrapped across dozens of lines, even though GenericTool already renders the full arguments behind its click-to-expand toggle.

Fix:

• Normalize whitespace/newlines per primitive argument and elide each value at 40 display columns with Locale.truncateWidth in primitiveInputSummary, so a large payload argument no longer hides trailing short arguments (such as format=markdown).
• Bound the total summary display width with Locale.truncateWidth (defaulting to 120 columns, and sized to the available session row width ctx.width - 3 - INLINE_TOOL_ICON_WIDTH in GenericTool and ExecuteCallView) while keeping the closing ].
• Pass truncate from GenericTool through InlineTool / InlineToolRow / Spinner (wrapMode="none" truncate) so the collapsed row never soft-wraps onto a second line during resize or when a scrollbar narrows the viewport.

How did you verify your code works?

• Added unit tests in packages/tui/test/util/tool-display.test.ts covering multi-kilobyte multi-line values alongside short arguments, many-argument width bounds, and CJK / ZWJ emoji grapheme boundaries.
• Added an end-to-end OpenTUI session regression test in packages/tui/test/generic-tool-summary.test.tsx (--rerun-each 10) verifying single-line collapsed rendering at both 100 and 44 columns and full untruncated input/output expansion on click.
• Ran bun typecheck and bun run typecheck:tsc in packages/tui and bun run check from the repo root.
• Captured before/after visual proofs with opencode-drive against origin/dev and this branch.

Visual

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 240 72" width="240" height="72" fill="none">
  <style>
    .mono { font: 10px ui-monospace, SFMono-Regular, Menlo, monospace; fill: currentColor; }
    .muted { opacity: 0.62; }
    .reply { animation: shift 5s ease-in-out infinite; }
    .details { opacity: 0; animation: expand 5s ease-in-out infinite; }
    @keyframes expand {
      0%, 45%, 92%, 100% { opacity: 0; }
      55%, 82% { opacity: 1; }
    }
    @keyframes shift {
      0%, 45%, 92%, 100% { transform: translateY(0); }
      55%, 82% { transform: translateY(24px); }
    }
    @media (prefers-reduced-motion: reduce) {
      .reply, .details { animation: none; }
    }
  </style>
  <rect x="8" y="8" width="2" height="12" fill="currentColor" opacity="0.5" />
  <text x="15" y="17" class="mono">Ingest architecture notes.</text>
  <text x="15" y="34" class="mono muted">&#x2713; ingest_document [content=# Hallaz&#x2026;, format=md]</text>
  <g class="details">
    <text x="25" y="46" class="mono muted">content:</text>
    <text x="76" y="46" class="mono"># Hallazgos del 2026-09-13 &#x2014; Section 01&#x2026;</text>
    <text x="25" y="57" class="mono muted">format:</text>
    <text x="76" y="57" class="mono">markdown</text>
  </g>
  <g class="reply">
    <text x="15" y="50" class="mono">Document ingested into index.</text>
  </g>
</svg>

Screenshots / recordings

Before / After (opencode-drive):

• Before (origin/dev): Calling a dynamic ingest_document plugin tool with a ~7.5 KB multi-line content string and format: "markdown" floods the entire 100×30 TUI viewport with soft-wrapped content=... lines in the collapsed state, pushing both the user prompt and the ✓ ingest_document header off screen.
• After (this branch): The collapsed row stays on a single tidy line (✓ ingest_document [content=# Hallazgos del 2026-09-13 — Architectu…, format=markdown]) directly between the user prompt and assistant response, and clicking the row expands the full multi-kilobyte content, format, and output in place.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

Added by the opencode bot (AI-generated).

Related: #54703