fdf-start

fdf-start is a command for coding agents from QuasarByte/feature-driven-flow-claude. It costs 18 tokens per session (135 once invoked), scanned A, original, MIT.

A command that runs all seven phases of the Feature-Driven-Flow workflow for a task, in a fixed order.

In plain words
What is it for?
It is for starting an end-to-end Feature-Driven-Flow task from a slash command.
Why use it?
It coordinates the full process and enforces the checks, rule selection, and instruction handling required before each phase can continue.

Command

Part of the feature-driven-flow plugin — 4 skills, 19 commands 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 commands/quasarbyte/feature-driven-flow-claude/fdf-start
Clone the repo
git clone --depth 1 https://github.com/QuasarByte/feature-driven-flow-claude

Or install feature-driven-flow, the plugin that ships this one along with the rest of its 4 skills, 19 commands.

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 fdf-start

README.md
[![agentmods](https://agentmods.dev/badge/commands/quasarbyte/feature-driven-flow-claude/fdf-start.svg)](https://agentmods.dev/commands/quasarbyte/feature-driven-flow-claude/fdf-start)
Your own site
<a href="https://agentmods.dev/commands/quasarbyte/feature-driven-flow-claude/fdf-start"><img src="https://agentmods.dev/badge/commands/quasarbyte/feature-driven-flow-claude/fdf-start.svg" alt="Measured on agentmods" height="20"></a>
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 135 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 $0.00018 $0.00135
Opus 5 $0.00009 $0.00068
Sonnet 5 $0.00004 $0.00027
Haiku 4.5 $0.00002 $0.00014

Measured 3d ago against content hash af33c6367d75, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fdf-start 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.

plugins/feature-driven-flow/commands/fdf-start.md · 12 lines

What it actually says

Task: $ARGUMENTS

Requirements:

  1. Treat this command as the slash-command entrypoint alias for the main feature-driven-flow conductor.
  2. Invoke the plugin skill feature-driven-flow:feature-driven-flow with the provided task and follow that conductor exactly.
  3. Execute all 7 phases in fixed order and honor all gates before advancing.
  4. Use the same settings, pack resolution, matrix handling, and effective-instructions behavior as the conductor skill.
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. 3d ago First seen · 12 lines · 18 tokens per session scan A af33c6367d75

Subscribe to this mod's changes

fdf-start is a command published in the GitHub repository QuasarByte/feature-driven-flow-claude (5 stars, last pushed 5mo ago), licensed MIT. It adds 18 tokens to every session and 135 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 2026-08-31.