perf(demo): reach the first tool call sooner

[anthonyiscoding]

The landing demo spent over two seconds typing the prompt and another two on
the opening thought before anything happened. Both are preamble; the run is
what the reader came for.

• Prompt types at 18ms/char instead of 42.
• The opening thought streams on a 1.1s total budget, via a small
  paceOver(body, totalMs) helper, instead of a per-token cadence whose
  length decided the duration.

Measured on the built demo, from page load: prompt fully typed at 1.6s, the
opening thought streams in 1.09s, engine::workers::list on screen at 5.1s.

The website vendors this build, so it ships alongside
iii-hq/iii#2029 there.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Enhancements
  • Improved the introductory thought-streaming animation for a smoother, more consistent presentation.
  • Increased prompt typing speed to make demo interactions feel more responsive.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
workers	Ready	Preview	Jul 31, 2026 4:43pm
workers-tech-spec	Ready	Preview	Jul 31, 2026 4:43pm

[github-actions]

skill-check — worker

0 verified, 51 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 44dedaeb-35b9-4b8c-a540-1ea679979878

📥 Commits

Reviewing files that changed from the base of the PR and between e28cec5 and cea7e9c.

📒 Files selected for processing (2)

• console/web/src/demo/LandingDemo.tsx
• console/web/src/demo/demo.css

📝 Walkthrough

Walkthrough

The demo now calculates opening-thought streaming pace for a 1.1-second duration and types prompts at a shorter per-character interval.

Changes

Demo timing

Layer / File(s)	Summary
Opening thought streaming console/web/src/demo/scenario.ts	Adds paceOver, defines OPENING_THOUGHT, and applies a calculated 1.1-second streaming pace to the first thought.
Prompt typing speed console/web/src/demo/usePlayer.ts	Reduces the prompt typing interval from 42 ms to 18 ms per character.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• iii-hq/workers#624: Introduced the demo files whose timing behavior this change updates.

Poem

A rabbit watches tokens flow,
At measured pace, they softly go.
Prompts now type with quicker feet,
The opening thought stays timed and neat.
Hop, hop—the demo is complete!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main performance change: reducing the time to the first tool call.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Fix failing CI checks

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch perf/demo-faster-first-tool-call

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