armature-harness 0.2.0

Harness engineering framework for AI coding agents -- the invisible skeleton that shapes agent output

Armature

The invisible skeleton that gives shape to what AI coding agents produce.

Armature is a harness engineering framework for AI coding agents. It wraps agents (Claude Code, Cursor, Copilot, Windsurf, Aider) in automated guides, sensors, budget controls, architectural enforcement, garbage collection, and self-healing pipelines.

Quick Start

pip install armature-harness

# Initialize in your project
cd your-project/
armature init

# Run quality checks
armature check

# Wire into Claude Code
armature hooks --claude-code

# Self-heal lint violations
armature heal --failures lint

The 6 Pillars

Pillar	What	CLI
Budget	Token/cost tracking per spec/phase, optimization suggestions	armature budget
Quality	Lint + type + test checks, quality gates (draft/review/merge), shift-left hooks	armature check
Context	CLAUDE.md/AGENTS.md generation, progressive disclosure, cross-session memory	armature hooks
Architecture	Layer boundary enforcement, class conformance, schema sync	armature check
GC	Architecture drift, stale docs, dead code, budget audit	armature gc
Self-Heal	Auto-fix lint, report type/test errors, circuit breaker escalation	armature heal

Configuration

Everything is configured in armature.yaml:

project:
  name: "my-project"
  language: python
  src_dir: "src/"

quality:
  enabled: true
  checks:
    lint: { tool: ruff, weight: 25 }
    type_check: { tool: mypy, weight: 25 }
    test: { tool: pytest, weight: 20, coverage_min: 85 }
  post_write:
    enabled: true  # shift-left: check on every file write

architecture:
  enabled: true
  layers:
    - { name: models, dirs: ["src/models/"] }
    - { name: services, dirs: ["src/services/"] }
    - { name: routes, dirs: ["src/routes/"] }
  boundaries:
    - { from: models, to: [routes] }

heal:
  enabled: true
  healers:
    lint: { auto_fix: true }

integrations:
  claude_code: { enabled: true }

IDE Integrations

armature hooks --claude-code      # .claude/settings.local.json
armature hooks --cursor           # .cursor/rules
armature hooks --copilot          # .github/copilot-instructions.md
armature hooks --github-actions   # .github/workflows/armature.yml
armature hooks --pre-commit       # .pre-commit-config.yaml

The Harness Engineering Model

Armature implements the harness engineering 2x2 grid:

	Computational (fast, deterministic)	Inferential (LLM-based)
Feedforward (guides)	armature.yaml rules, architecture config, type hints	CLAUDE.md rules, spec constraints
Feedback (sensors)	ruff, mypy, boundary checks, conformance, GC sweeps	LLM code review, eval judges

Claude Code Skills

Armature provides slash commands for Claude Code:

• /armature-check -- Run quality sensors
• /armature-heal -- Self-healing pipeline
• /armature-gc -- Garbage collection sweep
• /armature-budget -- Cost tracking and reporting

Budget Control

Track and optimize AI coding costs:

# Log usage
armature budget --spec SPEC-001 --phase build --tokens 50000 --cost 1.25

# Generate report
armature budget --report SPEC-001

Armature analyzes phase distribution, per-request token usage, and suggests optimizations: batch file reads, narrow context, progressive disclosure.

References

• Ossature -- Spec-driven development with validate/audit/build
• OpenAI Harness Engineering -- Harness patterns for AI coding agents
• Martin Fowler's Exploring Gen AI -- Bockeler/Fowler harness engineering series

License

MIT