workbench-builder

workbench-builder is a skill for Claude Code from theagenticguy/agentic-plugins. It costs 237 tokens per session (3,459 once invoked), scanned A, original, MIT.

A skill for building temporary browser workbenches on your computer with Bun, SQLite, React, and Astryx. A workbench is a live interface where a person works in the browser while an agent works from the terminal.

In plain words
What is it for?
Use it to create evaluation viewers, pull-request review rooms, document redlining tools, spreadsheets, triage queues, and trace replays. It provides server and front-end templates plus recipes for these workbench types.
Why use it?
It gives coding, evaluation, review, data, and triage sessions a shared interface with updates flowing between the person and the agent. The setup is designed to run locally without a build configuration or deployment.

Skill for Claude Code

Written for Claude Code: arguments in frontmatter. Also seen: mentions subagents; names the AskUserQuestion tool.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the agentic-skills plugin — 1 skill, 7 MCP servers shipped together

Good fit Use it to create evaluation viewers, pull-request review rooms, document redlining tools, spreadsheets, triage queues, and trace replays. It provides server and front-end templates plus recipes for these workbench types.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add theagenticguy/agentic-plugins
Claude Code
/plugin install agentic-skills

Made for: Claude Code.

Or install agentic-skills, the plugin that ships this one along with the rest of its 1 skill, 7 MCP servers.

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.

agentmods badge for workbench-builder

README.md
[![agentmods](https://agentmods.dev/badge/skills/theagenticguy/agentic-plugins/workbench-builder/github.svg)](https://agentmods.dev/skills/theagenticguy/agentic-plugins/workbench-builder)
Your own site
<a href="https://agentmods.dev/skills/theagenticguy/agentic-plugins/workbench-builder"><img src="https://agentmods.dev/badge/skills/theagenticguy/agentic-plugins/workbench-builder/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.

agentmods 80×15 button for workbench-builder

Your own site · 80×15
<a href="https://agentmods.dev/skills/theagenticguy/agentic-plugins/workbench-builder"><img src="https://agentmods.dev/badge/skills/theagenticguy/agentic-plugins/workbench-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 237 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,459 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00237 $0.03459
Opus 5.5 $0.00095 $0.01384
Sonnet 5.5 $0.00047 $0.00692
Haiku 4.5 $0.00024 $0.00346

Measured 1mo ago against content hash 4cb4f3f3425c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

workbench-builder scanned grade A with 1 finding 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 1mo ago.

The scan reads SKILL.md. This mod also ships 24 executable files (doc-review/scripts/review.ts, doc-review/scripts/wait-for-work.ts, doc-review/server.ts, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

Phase 0 is inline orchestrator work — name the workbench type and write the data model. Phases 1–3 each own one artifact and can run as a general-purpose `Agent` against `references/orchestrator.md`; for a single-surface
plugins/agentic-skills/skills/workbench-builder/SKILL.md · 144 lines

How it starts

The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Contents

File When to load
references/orchestrator.md Running the pipeline — the five phases, the subagent prompt shape, check-in cadence, stuck detection
references/write-protocol.md Canonical write-protocol block, copied verbatim into every phase worklog and subagent prompt
references/architecture.md The stack contract — SSE-as-invalidation, the fan-out, useRegion, the two-way loop, gotchas
references/dependencies.md The pinned dependency set, Astryx grounding commands (bunx astryx component), the Graphite theme
references/rendering.md Markdown/mermaid/ECharts patterns, the palette pairing rule, disclosure, overflow guards
references/recipes.md The recipe catalog — one data model + layout per workbench type, with the unique value of each
templates/server.ts Backend scaffold — schema, SSE fan-out + publish(), region queries, mutation + loop endpoints
templates/src/ Frontend scaffold — main.tsx, App.tsx, useRegion.ts, charts.ts, region components
templates/index.html Fullstack entry Bun.serve imports — the whole "no bundler" trick is this one file
templates/package.json The exact-pinned dependency manifest copied into every workbench
templates/graphite-theme/ Canonical Graphite theme — defineTheme source, built CSS/JS, the @font-face fallback
templates/terminal-helper.ts Zero-dependency bun script the terminal/agent runs to act on shared state and close the loop
templates/wait-for-work.ts Wake-on-work watcher — blocks on the SSE stream, exits with a digest when the human hands off work
templates/worklog-skeleton.md Per-phase worklog with the write-protocol block embedded and a Status: IN PROGRESS line

Read the full file on GitHub · 144 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

  1. 1mo ago First seen · 144 lines · 237 tokens per session scan A 4cb4f3f3425c

Subscribe to this mod's changes

workbench-builder is a skill published in the GitHub repository theagenticguy/agentic-plugins (5 stars, last pushed 2mo ago), licensed MIT. It adds 237 tokens to every session and 3,459 once invoked, about $0.0009 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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