Python Developer

STOP - Read before ANY tool call

1. Read {{GUARDRAILS_PATH}}
2. Read _shared/sdd-artifacts/SESSION.md; load session-state for $Cwd
3. If the relevant gate is not approved: STOP - ask user (pt-BR) - do NOT Write/Shell
4. SDD/develop skills: after ONE step/task, STOP session - handoff only
5. This skill body is English; user-facing prompts may be (pt-BR)

Step -1 - Gate check (report in chat before continuing)

Gate check:
[ ] guardrails.mdc read
[ ] SESSION.md read; session-state loaded
[ ] PIPELINE.md read (SDD skills only)
[ ] User confirmed current action (sim)
-> If any unchecked: STOP

Trigger

Invoke when the user asks for: /python-developer, python fix, implement FastAPI/Flask feature, or for small Python work that does not need a full PRD/PLAN cycle.

Outcome

Working Python code and tests in the open workspace: pytest (and project lint/type checks when configured) green, on a valid feature branch, with optional commit handoff. Supports FastAPI and Flask — not a FastAPI-only skill. Does not replace SDD for multi-step or cross-repo features.

When to prefer SDD instead

Recommend /sdd-spec -> sdd-plan -> sdd-develop if two or more apply:

Lazy-load (only when needed)

Do not preload other stack guideline packs or corporate pipeline docs. Load only the python-guidelines rows needed for the current task (FastAPI and/or Flask and pytest as applicable). MUST NOT glob architecture/** — load hub + one principles style from ARCH/CONTINUITY (brownfield: discover-first if style omitted).

Process

Step -1b - Caveman Mode (Full cap)

1. Read {{SDD_ROOT}}/preferences.json (create { "caveman_mode": false, "caveman_level": "full" } if missing).
2. If caveman_mode is false: continue without compression.
3. If true: load {{TOOLKIT_ROOT}}/skills/_shared/caveman/CAVEMAN.md; apply Full participation cap + prefs caveman_level (Lite skills never escalate); show once: [Caveman] Modo ativo (respostas compactas, level={effective}). Digite caveman off para desativar.
4. Honor caveman on|off|status|lite|full|ultra (and stop caveman / normal mode) during the session.
5. Auto-Clarity + never-compress gates/drafts/paths per CAVEMAN.md.

Subagent-first (before implement)

Classify complexity → consult capability subagents → if medium/complex and native: spawn ≤2 children (scoped paths + receipt); trivial stays in-parent; if subagents=none or Task unavailable → fallback in-parent (never hard-fail). Load SPAWN.md + subagent-first.md; do not paste guidelines into child prompts.

0. Workspace

Confirm Python project (pyproject.toml, requirements.txt, Pipfile, setup.py, or .py layout). Read AGENTS.md / README.md. Detect FastAPI vs Flask from dependencies — keep both in scope; do not force FastAPI onto Flask apps. Summarize the user request and acceptance.

1. Guidelines (step 0.5)

Follow {{TOOLKIT_ROOT}}/skills/_shared/developer-common/step-0.5-review-guidelines.md: load only the python-guidelines files needed for this task. Confirm test stack: pytest (pytest.md). Load fastapi.md and/or flask.md when those frameworks apply; keep principles.md / google-style.md for style when useful.

2. Branch (step 3)

Baseline branch from user or repo default. Create/checkout feature/<slug> or feat/<id> - never commit on main / master / develop.

3. Plan micro-steps

List 3-7 concrete tasks (files to touch, tests to add). Stay within one session when possible; checkpoint per context-management.mdc (>= 40% -> pause, offer /commit).

4. Implement

Match existing project patterns (Glob/Read similar modules first). Use a virtual environment (venv or uv).

Apply the matching python-guidelines docs while writing - do not paste full bodies into chat.

5. Tests

Add or update tests for changed behavior. Prefer integration-style API tests when the project already uses them; unit tests for isolated logic. Default runner: pytest.

6. Build and test

pytest

Add lint/type steps if configured (ruff, mypy, etc.). Fix failures within scope. Ask before running the full suite if the repo is very large.

7. Pre-commit (step 3.5) and handoff

Run {{TOOLKIT_ROOT}}/skills/_shared/developer-common/step-3.5-precommit-validation.md when appropriate. Offer /commit - do not commit automatically.

Before push/PR, run {{TOOLKIT_ROOT}}/skills/_shared/developer-common/step-7-checklist.md and confirm FastAPI/Flask/pytest guidance used as needed.

8. SDD escalation

If scope grows during work, stop and recommend:

/sdd-spec - [feature description]
# then
/sdd-plan - PRD/...
# then
/sdd-develop - PLAN/... - Step 1

Must not

• Paste guideline packs into child prompts (pass scoped paths + require receipt only)
• Spawn children for trivial work (keep in-parent)
• Hard-fail when capability subagents is none or Task is unavailable (use fallback in-parent)
• Treat the skill as FastAPI-only (Flask remains in scope)
• Nested feature/base/... branches; commit on default integration branches
• Speculative features outside stated acceptance (YAGNI)
• Auto-commit or auto-PR without user request
• Deprecated SDD skill aliases in handoff text - use sdd-spec, sdd-plan, sdd-develop, commit only

Handoff