fix(web): clean up composer resize animation by rynfar · Pull Request #5 · pylon-code/pylon

rynfar · 2026-08-11T22:38:34Z

Reworks the composer context strip's expand/collapse so widths are recomputed on every pass instead of latching remembered values that could go stale, and animates the controls through the Web Animations API at a fixed 180ms.

Cherry-picked from upstream c196f422ed387a1cc2cdb671b0472782e5610339 (pingdotgg/t3code#6209).

Fits Pylon's motion rules: the animation is a discrete, bounded transition rather than a continuous repaint, and it early-returns on prefers-reduced-motion: reduce.

Conflict resolved Pylon-first

BranchToolbar.tsx conflicted structurally, because upstream and Pylon lay the strip out differently:

Upstream moves the branch selector out of the left group and pushes it right (min-w-0 flex-1 justify-end md:ml-auto md:flex-none).
Pylon deliberately keeps it in the left run beside the workspace controls (min-w-0 justify-start, adopted as E16 / #5555), because they describe the same thing — where the thread's work happens — while Usage sits opposite.

Pylon's layout was kept and only upstream's animation machinery was taken: the data-composer-context-control markers, the strip's overflow-x-clip overflow-y-visible, and the motion constants. Verified after resolution that upstream's justify-end md:ml-auto did not sneak back in and that ComposerUsageIndicator's ml-auto placement survived. Added a comment at the divergence so the next merge does not silently undo it.

Verification

BranchToolbar tests pass (56)
Web typecheck, lint, and format clean across all 4 changed files

Model: Claude Opus 5 (1M context). Harness: Claude Code.

^{Need help on this PR? Tag @codesmith with what you need. Autofix is disabled.}

(cherry picked from commit c196f422ed387a1cc2cdb671b0472782e5610339)

github-actions · 2026-08-11T22:43:31Z

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	11.3 KiB	11.3 KiB	+21 B (+0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.5 KiB	5.5 KiB	−1 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	5.8 KiB	5.9 KiB	+22 B (+0.4%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	49.7 KiB	49.7 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	11.4 KiB	11.3 KiB	−2 B (−0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.5 KiB	5.5 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	5.9 KiB	5.9 KiB	−3 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	50.6 KiB	50.6 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: 0df9a9e · PR result: 7b2adaf · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 94.6 KiB
Claude decoded thread snapshot: 95.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

rynfar · 2026-08-11T22:38:34Z

Reworks the composer context strip's expand/collapse so widths are recomputed on every pass instead of latching remembered values that could go stale, and animates the controls through the Web Animations API at a fixed 180ms.

Cherry-picked from upstream c196f422ed387a1cc2cdb671b0472782e5610339 (pingdotgg/t3code#6209).

Fits Pylon's motion rules: the animation is a discrete, bounded transition rather than a continuous repaint, and it early-returns on prefers-reduced-motion: reduce.

Conflict resolved Pylon-first

BranchToolbar.tsx conflicted structurally, because upstream and Pylon lay the strip out differently:

Upstream moves the branch selector out of the left group and pushes it right (min-w-0 flex-1 justify-end md:ml-auto md:flex-none).
Pylon deliberately keeps it in the left run beside the workspace controls (min-w-0 justify-start, adopted as E16 / #5555), because they describe the same thing — where the thread's work happens — while Usage sits opposite.

Pylon's layout was kept and only upstream's animation machinery was taken: the data-composer-context-control markers, the strip's overflow-x-clip overflow-y-visible, and the motion constants. Verified after resolution that upstream's justify-end md:ml-auto did not sneak back in and that ComposerUsageIndicator's ml-auto placement survived. Added a comment at the divergence so the next merge does not silently undo it.

Verification

BranchToolbar tests pass (56)
Web typecheck, lint, and format clean across all 4 changed files

Model: Claude Opus 5 (1M context). Harness: Claude Code.

^{Need help on this PR? Tag @codesmith with what you need. Autofix is disabled.}

(cherry picked from commit c196f422ed387a1cc2cdb671b0472782e5610339)

github-actions · 2026-08-11T22:43:31Z

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	11.3 KiB	11.3 KiB	+21 B (+0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.5 KiB	5.5 KiB	−1 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	5.8 KiB	5.9 KiB	+22 B (+0.4%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	49.7 KiB	49.7 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	11.4 KiB	11.3 KiB	−2 B (−0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.5 KiB	5.5 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	5.9 KiB	5.9 KiB	−3 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	50.6 KiB	50.6 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: 0df9a9e · PR result: 7b2adaf · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 94.6 KiB
Claude decoded thread snapshot: 95.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

rynfar · 2026-08-11T22:38:34Z

Reworks the composer context strip's expand/collapse so widths are recomputed on every pass instead of latching remembered values that could go stale, and animates the controls through the Web Animations API at a fixed 180ms.

Cherry-picked from upstream c196f422ed387a1cc2cdb671b0472782e5610339 (pingdotgg/t3code#6209).

Fits Pylon's motion rules: the animation is a discrete, bounded transition rather than a continuous repaint, and it early-returns on prefers-reduced-motion: reduce.

Conflict resolved Pylon-first

BranchToolbar.tsx conflicted structurally, because upstream and Pylon lay the strip out differently:

Upstream moves the branch selector out of the left group and pushes it right (min-w-0 flex-1 justify-end md:ml-auto md:flex-none).
Pylon deliberately keeps it in the left run beside the workspace controls (min-w-0 justify-start, adopted as E16 / #5555), because they describe the same thing — where the thread's work happens — while Usage sits opposite.

Pylon's layout was kept and only upstream's animation machinery was taken: the data-composer-context-control markers, the strip's overflow-x-clip overflow-y-visible, and the motion constants. Verified after resolution that upstream's justify-end md:ml-auto did not sneak back in and that ComposerUsageIndicator's ml-auto placement survived. Added a comment at the divergence so the next merge does not silently undo it.

Verification

BranchToolbar tests pass (56)
Web typecheck, lint, and format clean across all 4 changed files

Model: Claude Opus 5 (1M context). Harness: Claude Code.

^{Need help on this PR? Tag @codesmith with what you need. Autofix is disabled.}

(cherry picked from commit c196f422ed387a1cc2cdb671b0472782e5610339)

github-actions · 2026-08-11T22:43:31Z

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	11.3 KiB	11.3 KiB	+21 B (+0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.5 KiB	5.5 KiB	−1 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	5.8 KiB	5.9 KiB	+22 B (+0.4%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	49.7 KiB	49.7 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	11.4 KiB	11.3 KiB	−2 B (−0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.5 KiB	5.5 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	5.9 KiB	5.9 KiB	−3 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	50.6 KiB	50.6 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: 0df9a9e · PR result: 7b2adaf · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 94.6 KiB
Claude decoded thread snapshot: 95.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

rynfar · 2026-08-11T22:38:34Z

Reworks the composer context strip's expand/collapse so widths are recomputed on every pass instead of latching remembered values that could go stale, and animates the controls through the Web Animations API at a fixed 180ms.

Cherry-picked from upstream c196f422ed387a1cc2cdb671b0472782e5610339 (pingdotgg/t3code#6209).

Fits Pylon's motion rules: the animation is a discrete, bounded transition rather than a continuous repaint, and it early-returns on prefers-reduced-motion: reduce.

Conflict resolved Pylon-first

BranchToolbar.tsx conflicted structurally, because upstream and Pylon lay the strip out differently:

Upstream moves the branch selector out of the left group and pushes it right (min-w-0 flex-1 justify-end md:ml-auto md:flex-none).
Pylon deliberately keeps it in the left run beside the workspace controls (min-w-0 justify-start, adopted as E16 / #5555), because they describe the same thing — where the thread's work happens — while Usage sits opposite.

Pylon's layout was kept and only upstream's animation machinery was taken: the data-composer-context-control markers, the strip's overflow-x-clip overflow-y-visible, and the motion constants. Verified after resolution that upstream's justify-end md:ml-auto did not sneak back in and that ComposerUsageIndicator's ml-auto placement survived. Added a comment at the divergence so the next merge does not silently undo it.

Verification

BranchToolbar tests pass (56)
Web typecheck, lint, and format clean across all 4 changed files

Model: Claude Opus 5 (1M context). Harness: Claude Code.

^{Need help on this PR? Tag @codesmith with what you need. Autofix is disabled.}

(cherry picked from commit c196f422ed387a1cc2cdb671b0472782e5610339)

github-actions · 2026-08-11T22:43:31Z

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	11.3 KiB	11.3 KiB	+21 B (+0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.5 KiB	5.5 KiB	−1 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	5.8 KiB	5.9 KiB	+22 B (+0.4%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	49.7 KiB	49.7 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	11.4 KiB	11.3 KiB	−2 B (−0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.5 KiB	5.5 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	5.9 KiB	5.9 KiB	−3 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	50.6 KiB	50.6 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: 0df9a9e · PR result: 7b2adaf · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 94.6 KiB
Claude decoded thread snapshot: 95.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

rynfar · 2026-08-11T22:38:34Z

Reworks the composer context strip's expand/collapse so widths are recomputed on every pass instead of latching remembered values that could go stale, and animates the controls through the Web Animations API at a fixed 180ms.

Cherry-picked from upstream c196f422ed387a1cc2cdb671b0472782e5610339 (pingdotgg/t3code#6209).

Fits Pylon's motion rules: the animation is a discrete, bounded transition rather than a continuous repaint, and it early-returns on prefers-reduced-motion: reduce.

Conflict resolved Pylon-first

BranchToolbar.tsx conflicted structurally, because upstream and Pylon lay the strip out differently:

Upstream moves the branch selector out of the left group and pushes it right (min-w-0 flex-1 justify-end md:ml-auto md:flex-none).
Pylon deliberately keeps it in the left run beside the workspace controls (min-w-0 justify-start, adopted as E16 / #5555), because they describe the same thing — where the thread's work happens — while Usage sits opposite.

Pylon's layout was kept and only upstream's animation machinery was taken: the data-composer-context-control markers, the strip's overflow-x-clip overflow-y-visible, and the motion constants. Verified after resolution that upstream's justify-end md:ml-auto did not sneak back in and that ComposerUsageIndicator's ml-auto placement survived. Added a comment at the divergence so the next merge does not silently undo it.

Verification

BranchToolbar tests pass (56)
Web typecheck, lint, and format clean across all 4 changed files

Model: Claude Opus 5 (1M context). Harness: Claude Code.

^{Need help on this PR? Tag @codesmith with what you need. Autofix is disabled.}

(cherry picked from commit c196f422ed387a1cc2cdb671b0472782e5610339)

github-actions · 2026-08-11T22:43:31Z

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	11.3 KiB	11.3 KiB	+21 B (+0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.5 KiB	5.5 KiB	−1 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	5.8 KiB	5.9 KiB	+22 B (+0.4%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	49.7 KiB	49.7 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	11.4 KiB	11.3 KiB	−2 B (−0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.5 KiB	5.5 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	5.9 KiB	5.9 KiB	−3 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	50.6 KiB	50.6 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: 0df9a9e · PR result: 7b2adaf · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 94.6 KiB
Claude decoded thread snapshot: 95.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

rynfar · 2026-08-11T22:38:34Z

Reworks the composer context strip's expand/collapse so widths are recomputed on every pass instead of latching remembered values that could go stale, and animates the controls through the Web Animations API at a fixed 180ms.

Cherry-picked from upstream c196f422ed387a1cc2cdb671b0472782e5610339 (pingdotgg/t3code#6209).

Fits Pylon's motion rules: the animation is a discrete, bounded transition rather than a continuous repaint, and it early-returns on prefers-reduced-motion: reduce.

Conflict resolved Pylon-first

BranchToolbar.tsx conflicted structurally, because upstream and Pylon lay the strip out differently:

Upstream moves the branch selector out of the left group and pushes it right (min-w-0 flex-1 justify-end md:ml-auto md:flex-none).
Pylon deliberately keeps it in the left run beside the workspace controls (min-w-0 justify-start, adopted as E16 / #5555), because they describe the same thing — where the thread's work happens — while Usage sits opposite.

Pylon's layout was kept and only upstream's animation machinery was taken: the data-composer-context-control markers, the strip's overflow-x-clip overflow-y-visible, and the motion constants. Verified after resolution that upstream's justify-end md:ml-auto did not sneak back in and that ComposerUsageIndicator's ml-auto placement survived. Added a comment at the divergence so the next merge does not silently undo it.

Verification

BranchToolbar tests pass (56)
Web typecheck, lint, and format clean across all 4 changed files

Model: Claude Opus 5 (1M context). Harness: Claude Code.

^{Need help on this PR? Tag @codesmith with what you need. Autofix is disabled.}

(cherry picked from commit c196f422ed387a1cc2cdb671b0472782e5610339)

github-actions · 2026-08-11T22:43:31Z

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	11.3 KiB	11.3 KiB	+21 B (+0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.5 KiB	5.5 KiB	−1 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	5.8 KiB	5.9 KiB	+22 B (+0.4%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	49.7 KiB	49.7 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	11.4 KiB	11.3 KiB	−2 B (−0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.5 KiB	5.5 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	5.9 KiB	5.9 KiB	−3 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	50.6 KiB	50.6 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: 0df9a9e · PR result: 7b2adaf · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 94.6 KiB
Claude decoded thread snapshot: 95.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

rynfar · 2026-08-11T22:38:34Z

Reworks the composer context strip's expand/collapse so widths are recomputed on every pass instead of latching remembered values that could go stale, and animates the controls through the Web Animations API at a fixed 180ms.

Cherry-picked from upstream c196f422ed387a1cc2cdb671b0472782e5610339 (pingdotgg/t3code#6209).

Fits Pylon's motion rules: the animation is a discrete, bounded transition rather than a continuous repaint, and it early-returns on prefers-reduced-motion: reduce.

Conflict resolved Pylon-first

BranchToolbar.tsx conflicted structurally, because upstream and Pylon lay the strip out differently:

Upstream moves the branch selector out of the left group and pushes it right (min-w-0 flex-1 justify-end md:ml-auto md:flex-none).
Pylon deliberately keeps it in the left run beside the workspace controls (min-w-0 justify-start, adopted as E16 / #5555), because they describe the same thing — where the thread's work happens — while Usage sits opposite.

Pylon's layout was kept and only upstream's animation machinery was taken: the data-composer-context-control markers, the strip's overflow-x-clip overflow-y-visible, and the motion constants. Verified after resolution that upstream's justify-end md:ml-auto did not sneak back in and that ComposerUsageIndicator's ml-auto placement survived. Added a comment at the divergence so the next merge does not silently undo it.

Verification

BranchToolbar tests pass (56)
Web typecheck, lint, and format clean across all 4 changed files

Model: Claude Opus 5 (1M context). Harness: Claude Code.

^{Need help on this PR? Tag @codesmith with what you need. Autofix is disabled.}

(cherry picked from commit c196f422ed387a1cc2cdb671b0472782e5610339)

github-actions · 2026-08-11T22:43:31Z

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	11.3 KiB	11.3 KiB	+21 B (+0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.5 KiB	5.5 KiB	−1 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	5.8 KiB	5.9 KiB	+22 B (+0.4%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	49.7 KiB	49.7 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	11.4 KiB	11.3 KiB	−2 B (−0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.5 KiB	5.5 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	5.9 KiB	5.9 KiB	−3 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	50.6 KiB	50.6 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: 0df9a9e · PR result: 7b2adaf · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 94.6 KiB
Claude decoded thread snapshot: 95.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

rynfar · 2026-08-11T22:38:34Z

Reworks the composer context strip's expand/collapse so widths are recomputed on every pass instead of latching remembered values that could go stale, and animates the controls through the Web Animations API at a fixed 180ms.

Cherry-picked from upstream c196f422ed387a1cc2cdb671b0472782e5610339 (pingdotgg/t3code#6209).

Fits Pylon's motion rules: the animation is a discrete, bounded transition rather than a continuous repaint, and it early-returns on prefers-reduced-motion: reduce.

Conflict resolved Pylon-first

BranchToolbar.tsx conflicted structurally, because upstream and Pylon lay the strip out differently:

Upstream moves the branch selector out of the left group and pushes it right (min-w-0 flex-1 justify-end md:ml-auto md:flex-none).
Pylon deliberately keeps it in the left run beside the workspace controls (min-w-0 justify-start, adopted as E16 / #5555), because they describe the same thing — where the thread's work happens — while Usage sits opposite.

Pylon's layout was kept and only upstream's animation machinery was taken: the data-composer-context-control markers, the strip's overflow-x-clip overflow-y-visible, and the motion constants. Verified after resolution that upstream's justify-end md:ml-auto did not sneak back in and that ComposerUsageIndicator's ml-auto placement survived. Added a comment at the divergence so the next merge does not silently undo it.

Verification

BranchToolbar tests pass (56)
Web typecheck, lint, and format clean across all 4 changed files

Model: Claude Opus 5 (1M context). Harness: Claude Code.

^{Need help on this PR? Tag @codesmith with what you need. Autofix is disabled.}

(cherry picked from commit c196f422ed387a1cc2cdb671b0472782e5610339)

github-actions · 2026-08-11T22:43:31Z

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	11.3 KiB	11.3 KiB	+21 B (+0.2%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.5 KiB	5.5 KiB	−1 B (−0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	5.8 KiB	5.9 KiB	+22 B (+0.4%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	49.7 KiB	49.7 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	11.4 KiB	11.3 KiB	−2 B (−0.0%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.5 KiB	5.5 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	5.9 KiB	5.9 KiB	−3 B (−0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	50.6 KiB	50.6 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: 0df9a9e · PR result: 7b2adaf · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 94.6 KiB
Claude decoded thread snapshot: 95.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

fix(web): clean up composer resize animation (#6209)
7b2adaf
(cherry picked from commit c196f422ed387a1cc2cdb671b0472782e5610339)

github-actionsBot added vouch:trusted PR author is trusted by repo permissions or the VOUCHED list. size:L labels Aug 11, 2026

rynfar merged commit 8468857 into pylonAug 11, 2026
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rynfar deleted the upstream/2026-08-12-composer-resize branch August 11, 2026 22:51

rynfar mentioned this pull request Aug 11, 2026
docs: record the 2026-08-12 upstream batch and advance the cursor #8
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rynfar mentioned this pull request Aug 30, 2026
Prime provider parity: tasks, automation, and upstream watch #114
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