A fast planning workflow that creates a user story, implementation plan, and task list in one pass. TDD-style RED → GREEN → REFACTOR means writing a failing test, making it pass, and then improving the code.

Use it for fast-forward planning of software changes, from the initial story through actionable tasks and quality checks.

It turns an idea into structured planning artifacts quickly and can continue into implementation, review, and verification when enabled.

How benwu95/prospec configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to benwu95/prospec. 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/benwu95/prospec/main/.agents/skills/prospec-ff/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/benwu95/prospec

Made for: Claude Code, Codex.

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/benwu95/prospec/prospec-ff/github.svg)](https://agentmods.dev/skills/benwu95/prospec/prospec-ff)

Your own site

<a href="https://agentmods.dev/skills/benwu95/prospec/prospec-ff"><img src="https://agentmods.dev/badge/skills/benwu95/prospec/prospec-ff/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/benwu95/prospec/prospec-ff"><img src="https://agentmods.dev/badge/skills/benwu95/prospec/prospec-ff.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,569 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	$0.00051	$0.04569
Opus 5.5	$0.00020	$0.01828
Sonnet 5.5	$0.00010	$0.00914
Haiku 4.5	$0.00005	$0.00457

Measured 3d ago against content hash 797cf61ef9cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

prospec-ff 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 3d 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.

.agents/skills/prospec-ff/SKILL.md · 215 lines

How it starts

The opening of the file, as written. The whole thing — 215 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Prospec Fast-Forward Skill

Activation

Briefly describe Story → Plan → Tasks (quick: Story → Tasks), Draft-First inference or a 3-question interview, and optional cascading through implementation/review/verify to Grade S/A, where Tastemaker sign-off halts execution.

Language Policy

Write each generated document in the language the Constitution's Language Policy rule assigns to its path — change artifacts and their archived summaries in the project's artifact language, the trust zone (Knowledge base, Feature Specs, index) in English. One skill run may write both. Free text you pass the CLI that lands in a change artifact follows the artifact language too, leaving its paths, commands, enum values and the fixed prefixes the CLI matches untranslated. Keep code, identifiers, technical terms, and git commit messages in English.

CLI Prerequisite (required)

The prospec CLI is a required file for this skill — its deterministic steps call prospec commands. Probe BEFORE any other step; there is no manual fallback.

Run prospec --version (Bash).
Command not found / not executable → STOP. Ask the user to install the prospec standalone executable — the one-click installer script from the project README (macOS/Linux install.sh, Windows install.ps1) or a release binary from GitHub Releases; prospec is NOT published to npm. Then re-run this skill.
Version older than 2.10.0 → STOP. Report the installed vs required version and ask the user to upgrade, then re-run this skill.

Hand-executing a CLI-owned mutation is NEVER the fallback — that re-introduces the nondeterministic serialization this contract exists to remove.

Evidence uses snapshot-v2 / repository-inputs-v2: working-tree content of git index members. Unchanged members and effective content preserve evidence across staging and equivalent commits. Revalidate legacy records once.

Read the full file on GitHub · 215 lines

Files

What ships with it

12 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.

3d ago Changed 797cf61ef9cf
4d ago Changed 6b7755f1f5e8
9d ago Changed 801f5ed38cd6
12d ago Changed · -1 lines cfb2ed58b1e1
13d ago Changed 41f9f6c4685e
20d ago Changed · -1 lines 4ee8cb3c3def
23d ago Changed 9181fba9fc2d
27d ago Changed · +2 lines 594ee0d0d0d2
28d ago Changed b76e494d7334
1mo ago First seen · 215 lines · 51 tokens per session scan A 65c2542a7548

Subscribe to this mod's changes

prospec-ff is a skill published in the GitHub repository benwu95/prospec (6 stars, last pushed yesterday), licensed MIT. It adds 51 tokens to every session and 4,569 once invoked, about $0.0002 per session on Opus 5.5. 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.

Planning agentic-coding ai-coding-assistant ai-knowledge progressive-disclosure sdd spec-driven-development

prospec-ff next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
prospec-ffbenwu95/prospec	Skill	6	yesterday	MIT	A	51	Claude Code, Codex
ospec-goalclawplays/ospec	Skill	390	2mo ago	MIT	A	29	Codex
ospecclawplays/ospec	Skill	390	2mo ago	MIT	A	26	Claude Code, Codex
ospec-changeclawplays/ospec	Skill	390	2mo ago	MIT	A	18	Codex
review-spdzhu1090093659/spec_driven_develop	Skill	993	3mo ago	MIT	A	72	Claude Code
deep-discusszhu1090093659/spec_driven_develop	Skill	993	3mo ago	MIT	A	181	Claude Code
spec-driven-developzhu1090093659/spec_driven_develop	Skill	993	3mo ago	MIT	A	148	Claude Code

prospec: Skill for Claude Code