Blueprint
Convert natural-language specifications into formal blueprints with testable acceptance criteria before any code is written.
Install
npx codex-marketplace add JuliusBrussee/blueprint --plugin Blueprint enforces spec-first development inside Codex. Before the agent writes a single line of implementation code, Blueprint converts the feature description into a structured blueprint: objectives, constraints, component list, interface definitions, and acceptance criteria in Given/When/Then format.
The resulting blueprint becomes the authoritative context for subsequent Codex implementation sessions, keeping generated code aligned with the original specification. Featured on the Codex Marketplace home page as a community plugin.
Features
Spec to blueprint
Converts a plain English spec into a structured blueprint with sections.
Testable criteria
Generates acceptance criteria in Given/When/Then format.
Implementation handoff
Blueprint feeds directly into Codex implementation prompts.
Common Use Cases
- Spec-driven development with Codex
- Generating acceptance tests before implementation
- Architecture decision capture