buildpacks-io

Project Descriptor (project.toml)

The Project Descriptor extension defines project.toml — the optional app-root file letting developers declare their builder image, include/exclude globs, buildpack overrides (pre/group/post), and build-time env vars. Read by `pack build` and other platforms before invoking the lifecycle.

GitHub

Documentation

📖
Documentation
https://github.com/buildpacks/spec/blob/main/extensions/project-descriptor.md

Schemas & Data

📊
JSONSchema
https://raw.githubusercontent.com/api-evangelist/buildpacks-io/refs/heads/main/json-schema/buildpacks-project-toml-schema.json

API entry from apis.yml

apis.yml Raw ↑ 
aid: buildpacks-io:project-descriptor-spec
name: Project Descriptor (project.toml)
tags:
- Cloud Native Buildpacks
- Project Descriptor
- App Surface
humanURL: https://github.com/buildpacks/spec/blob/main/extensions/project-descriptor.md
properties:
- url: https://github.com/buildpacks/spec/blob/main/extensions/project-descriptor.md
  type: Documentation
- url: json-schema/buildpacks-project-toml-schema.json
  type: JSONSchema
description: The Project Descriptor extension defines project.toml — the optional app-root file letting
  developers declare their builder image, include/exclude globs, buildpack overrides (pre/group/post),
  and build-time env vars. Read by `pack build` and other platforms before invoking the lifecycle.