What is waterfall-ui?

A specification for a waterfall timeline interface, similar to the timing view in Chrome DevTools. It describes how coding-agent sessions, tasks, tools, durations, tokens, and details appear over time.

Use it when building or changing the waterfall component, detail panel, session picker, filters, or other noctrace visual elements.

It gives the interface a consistent layout for understanding which operations ran, how long they took, and how they relate to one another.

How nyktora/noctrace configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to nyktora/noctrace. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/nyktora/noctrace/main/.claude/skills/waterfall-ui/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/nyktora/noctrace

Made for: Claude Code.

Or install noctrace, the plugin that ships this one along with the rest of its 5 skills, 4 agents, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/nyktora/noctrace/waterfall-ui/github.svg)](https://agentmods.dev/skills/nyktora/noctrace/waterfall-ui)

Your own site

<a href="https://agentmods.dev/skills/nyktora/noctrace/waterfall-ui"><img src="https://agentmods.dev/badge/skills/nyktora/noctrace/waterfall-ui/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/nyktora/noctrace/waterfall-ui"><img src="https://agentmods.dev/badge/skills/nyktora/noctrace/waterfall-ui.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,813 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00034	$0.01813
Opus 5	$0.00017	$0.00907
Sonnet 5	$0.00007	$0.00363
Haiku 4.5	$0.00003	$0.00181

Measured 9d ago against content hash 163fb51c7d89, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

waterfall-ui scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/waterfall-ui/SKILL.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Waterfall UI Specification

Layout (Desktop-First, Chrome DevTools Network Tab)

┌──────────────────────────────────────────────────────────────┐
│ [Logo] [Session Tabs] [Filter]              [Stats]          │
├───────────┬──────┬───────┬───────────────────────────────────┤
│ Name      │ Type │ Time  │ Waterfall (time axis)             │
├───────────┼──────┼───────┼───────────────────────────────────┤
│ ▼ planner │ Task │ 12.0s │ ████████████████████████████████  │
│   Read    │ Read │ 0.3s  │  ██                               │
│   Write   │Write │ 4.5s  │      ████████████                 │
│ ▼ tdd     │ Task │ 23.5s │    ████████████████████████████   │
│   Bash    │ Bash │ 4.2s  │      ████████                     │
│   Edit    │ Edit │ 1.8s  │                  █████            │
├───────────┴──────┴───────┴───────────────────────────────────┤
│ [Detail Panel — tool input/output on row click]              │
└──────────────────────────────────────────────────────────────┘

Column Widths

Name: 200px fixed
Type: 56px fixed
Time: 52px fixed
Tokens: 68px fixed (like Chrome DevTools "Size" column)
Waterfall: flex (remaining space)

Token Display Rules

Format: under 1000 show raw number (e.g., "340"), 1000+ show with "k" suffix (e.g., "4.1k", "18.4k")
Show sum of input + output tokens per row
Agent rows show their own overhead tokens (the Task tool_use itself), not the sum of children
Highlight in yellow (#f9e2af) when a single tool call exceeds 5000 total tokens (expensive call)
Detail panel shows the split: "2.8k in / 95 out"
Toolbar stats area shows total session token count

Waterfall Bar Rendering

Bars are div elements with position: absolute inside a relative container.

left = ((row.startTime - sessionStart) / totalDuration) * 100 + "%"
width = ((row.duration || (now - row.startTime)) / totalDuration) * 100 + "%"

Minimum width: 0.4% (so very short calls are still visible).

Color Palette (Catppuccin Mocha)

Read the full file on GitHub · 167 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago First seen · 167 lines · 34 tokens per session scan A 163fb51c7d89

Subscribe to this mod's changes

waterfall-ui is a skill published in the GitHub repository nyktora/noctrace (5 stars, last pushed 4mo ago), licensed MIT. It adds 34 tokens to every session and 1,813 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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