Problem

The extension-builder skill provides instructions for scaffolding a new extension, but the actual directory creation, pyproject.toml generation, and boilerplate file creation must be done manually (or by an agent following the skill's text instructions). An autonomous agent building a domain-specific extension needs a CLI command that does the mechanical setup, so the skill becomes documentation for how to fill in the scaffold rather than instructions the agent must execute step by step.

Proposed Solution

`pyrite extension init` command

```bash

Scaffold a new extension

pyrite extension init legal --path extensions/legal

With entry types pre-declared

pyrite extension init legal --path extensions/legal \ --types case,statute,ruling,party

With description for plugin metadata

pyrite extension init legal --path extensions/legal \ --description "Legal research domain types and tools" ```

Generated structure

``` extensions/legal/ pyproject.toml # With entry point, hatchling build src/pyrite_legal/ __init__.py plugin.py # Plugin class skeleton with get_entry_types, get_validators entry_types.py # Dataclass skeletons for declared types validators.py # Validator skeleton (returns [] for unrelated types) preset.py # Preset skeleton tests/ test_legal.py # 8-section test skeleton ```

Behavior

Generates valid, importable Python that passes ruff and basic pytest

Pre-populates the entry type skeletons with `entry_type` property, `to_frontmatter`, `from_frontmatter`

Test file includes `TestPluginRegistration` with correct plugin name

Validator includes the critical "return [] for unrelated types" pattern

`--format json` returns the list of created files

Why separate from the skill

The skill knows what a good extension looks like (architecture, patterns, gotchas). The CLI command handles file creation mechanics. Together: the agent runs `pyrite extension init`, then uses the skill to fill in the real logic, then uses pyrite-dev's TDD protocol to test it.

bhag-self-configuring-knowledge-infrastructure — Agent-built extensions

extension-builder-skill — Skill for the design/implementation phase

pyrite extension init CLI Commandbacklog_item