fast

fast is a skill for Claude Code from SienkLogic/plan-build-run. It costs 24 tokens per session (696 once invoked), scanned A, original, MIT.

A shortcut for handling a small coding task directly, without creating a plan or using extra agents.

In plain words
What is it for?
Use it for tasks such as fixing a typo, changing a configuration value, adding an import, renaming a variable, or updating a version.
Why use it?
It avoids unnecessary process for simple changes that affect only a few files and need no research.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions subagents.

Part of the pbr plugin — 45 skills, 71 commands, 18 agents, 3 hooks shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/sienklogic/plan-build-run/fast
Any agent
npx skills add SienkLogic/plan-build-run --skill fast
Clone the repo
git clone --depth 1 https://github.com/SienkLogic/plan-build-run

Made for: Claude Code.

Or install pbr, the plugin that ships this one along with the rest of its 45 skills, 71 commands, 18 agents, 3 hooks.

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 fast

README.md
[![agentmods](https://agentmods.dev/badge/skills/sienklogic/plan-build-run/fast.svg)](https://agentmods.dev/skills/sienklogic/plan-build-run/fast)
Your own site
<a href="https://agentmods.dev/skills/sienklogic/plan-build-run/fast"><img src="https://agentmods.dev/badge/skills/sienklogic/plan-build-run/fast.svg" alt="Measured on agentmods" height="20"></a>
Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 696 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00024 $0.00696
Opus 5 $0.00012 $0.00348
Sonnet 5 $0.00005 $0.00139
Haiku 4.5 $0.00002 $0.00070

Measured 2d ago against content hash 33573c31ad33, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

fast 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 2d 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.

plugins/pbr/skills/fast/SKILL.md · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

STOP — DO NOT READ THIS FILE. You are already reading it.

/pbr:fast — Inline Trivial Task Execution

Execute a trivial task directly in the current context. No subagents, no PLAN.md, no research. For tasks like: fix a typo, update a config value, add a missing import, rename a variable, add a .gitignore entry, bump a version.

Use /pbr:quick for anything needing multi-step planning, research, or verification.

Step 0 — Banner

╔══════════════════════════════════════════════════════════════╗
║  PLAN-BUILD-RUN ► FAST                                       ║
╚══════════════════════════════════════════════════════════════╝

Step 1 — Parse Task

If $ARGUMENTS is empty, ask: "What's the quick fix? (one sentence)"

Store as the task description.

Step 2 — Scope Check

A task is trivial if it needs:

  • 3 or fewer file edits
  • No new dependencies or architecture changes
  • No research needed

If the task seems non-trivial, say:

This looks like it needs planning. Use /pbr:quick instead:
  /pbr:quick "{task description}"

And stop.

Step 3 — Execute Inline

Do the work directly:

  1. Read the relevant file(s)
  2. Make the change(s) using Edit or Write
  3. Verify the change works (run existing tests if applicable)

No PLAN.md. No Task() spawn. Just do it.

Step 4 — Commit

Stage specific files (NEVER git add .) and commit:

git add {specific files}
git commit -m "{type}(fast): {concise description}"

Use conventional commit types: fix, feat, docs, chore, refactor as appropriate.

Step 5 — Log to Quick Tasks

If .planning/quick/ exists, create a minimal tracking entry:

  1. Find next NNN: scan .planning/quick/ for highest existing number + 1
  2. Create .planning/quick/{NNN}-fast-{slug}/PLAN.md with a one-line plan
  3. Create .planning/quick/{NNN}-fast-{slug}/SUMMARY.md with the commit hash and description

This ensures fast tasks appear in state tracking alongside quick tasks.

Step 6 — Report

╔══════════════════════════════════════════════════════════════╗
║  FAST ✓                                                      ║
╚══════════════════════════════════════════════════════════════╝

{commit hash} — {commit message}
Files: {changed files}

Read the full file on GitHub · 95 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.

  1. 2d ago First seen · 95 lines · 24 tokens per session scan A 33573c31ad33

Subscribe to this mod's changes

fast is a skill published in the GitHub repository SienkLogic/plan-build-run (17 stars, last pushed 5mo ago), licensed MIT. It adds 24 tokens to every session and 696 once invoked, about $0.0001 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 2026-09-03.

Related

Other skills, from other repositories

handoff-update

Update an existing handoff document with current session progress. Applies section-specific merge rules: append-only for Work Done (never deletes history), replace for Status and Next Steps, merge for Files and Discoveries. Falls back to creating a new handoff if no source file is found.

FlorianBruniaux/claude-code-ultimate-guide · 60 tokens

handoff-create

Generate a structured handoff document from the current session. Captures scope, relevant files with line numbers, key discoveries, work completed, current status, next steps, and code snippets. Use before ending a session or handing work to another agent.

FlorianBruniaux/claude-code-ultimate-guide · 53 tokens

handoff-resume

Load a handoff document and resume work from where a previous session left off. Parses scope, file references, completed work, and next steps, then confirms understanding before proceeding.

FlorianBruniaux/claude-code-ultimate-guide · 40 tokens

mission-slice-sop

Use when starting, building, handing off, restoring, or closing a mission or slice under the default lightweight SDLC.

mvschwarz/openrig · 30 tokens

doncheli-api-contract

Design complete API contracts covering endpoints, auth, rate limiting, error handling, retries, circuit breaker and idempotency. Activate when user mentions "api contract", "api design", "endpoint", "webhook", "REST", "GraphQL", "OpenAPI", "design the API".

doncheli/don-cheli-sdd · 65 tokens

doncheli-tech-panel

Convene a senior engineering expert panel to evaluate technical decisions. Activate when user mentions "tech panel", "technical discussion", "expert opinion", "architecture decision", "which technology", "should we use".

doncheli/don-cheli-sdd · 47 tokens