# Anthropic Spec Kit — llms.txt
# The home of spec-driven development: the methodology where a written
# specification drives planning, task breakdown, and implementation.
# Independent project; not affiliated with or endorsed by Anthropic.

## About
- [About](https://anthropicspeckit.com/about.html): why this project exists and the roadmap.
- [FAQ](https://anthropicspeckit.com/faq.html): spec-driven development vs agile and design docs, when to spec, AI agents, spec ownership.

## Methodology
- [The spec-driven methodology](https://anthropicspeckit.com/methodology.html): seven principles, the six-stage lifecycle (discover → specify → plan → decompose → build → verify), comparison with ad-hoc prompting and ticket-driven development, and six anti-patterns.

## Spec templates (annotated, copy-ready)
- [Feature spec](https://anthropicspeckit.com/templates/feature-spec.html): the full-lifecycle template — problem, scope, acceptance criteria, plan, task breakdown.
- [API spec](https://anthropicspeckit.com/templates/api-spec.html): endpoints, schemas, error contracts, versioning, consumer impact.
- [Bugfix spec](https://anthropicspeckit.com/templates/bugfix-spec.html): reproduction, root-cause hypothesis, fix strategy, regression tests.
- [Migration spec](https://anthropicspeckit.com/templates/migration-spec.html): phased plan, backfill strategy, dual-write windows, rollback criteria.
- [Refactor spec](https://anthropicspeckit.com/templates/refactor-spec.html): current-state analysis, target design, behavior-preservation guarantees, staged rollout.
- [Architecture decision record](https://anthropicspeckit.com/templates/architecture-decision-record.html): context, options, decision, consequences.
- [Template gallery](https://anthropicspeckit.com/templates.html): all six templates with filters.

## Training
- [Spec-Driven Development Foundations](https://anthropicspeckit.com/training.html): four-module course — the spec mindset, acceptance criteria, task decomposition, review loops. Self-paced, live cohort, and team workshop formats.

## Marketplace
- [Spec Template Marketplace (coming soon)](https://anthropicspeckit.com/marketplace.html): community-reviewed template packs for specific stacks and domains, with a waitlist.

## Key definitions
- **Spec-driven development**: a software delivery methodology where a written specification is the source of truth; the spec drives the plan, the plan is decomposed into verifiable tasks, and tasks are built and verified against the spec.
- **The loop**: specify → plan → decompose → build, with a review gate that closes back on the spec.
- **Acceptance criteria**: verifiable, true-or-false statements that define "done" for each requirement.