Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add aaronbassett/agent-foundry --skill writergit clone --depth 1 https://github.com/aaronbassett/agent-foundryWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/aaronbassett/agent-foundry/writer)<a href="https://agentmods.dev/skills/aaronbassett/agent-foundry/writer"><img src="https://agentmods.dev/badge/skills/aaronbassett/agent-foundry/writer.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00088 | $0.01937 |
| Opus 5 | $0.00044 | $0.00968 |
| Sonnet 5 | $0.00018 | $0.00387 |
| Haiku 4.5 | $0.00009 | $0.00194 |
Grade A, and why
constitution:writer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 218 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Constitution Writer
Write a tailored constitution by discovering project characteristics and recommending matched principles.
Workflow
Phase 1: Project Discovery
Ask questions to understand the project. Group related questions; don't overwhelm with all at once.
Round 1 - Project Nature:
- Is this a hackathon/prototype, internal tool, commercial product, or open-source project?
- What's the expected lifespan? (days/weeks, months, years, indefinite)
- Solo developer or team? If team, how many contributors?
Round 2 - Technical Profile:
- What's the architecture style? (monolith, modular, distributed/microservices, CLI tool, library/SDK)
- What's the primary tech stack? (language, frameworks)
- Will this system be public-facing, internal, or both?
Round 3 - Risk & Operations:
- How critical is uptime? (best-effort, business hours, 99%+, mission-critical)
- Are there security/regulatory constraints? (financial, healthcare, PII, none specific)
- What's your expected release cadence? (continuous, weekly, monthly, infrequent)
Round 4 - Quality Expectations:
- How important is test coverage? (manual testing fine, critical paths only, comprehensive)
- Do you need audit trails or data replay? (yes/no)
- What's more important right now: shipping fast or building for longevity?
Phase 2: Principle Selection
Based on discovery, select principles from the catalog below. Only suggest what matches the project profile.
Selection Rules:
| Project Characteristic | Suggested Principles |
|---|---|
| Hackathon/prototype | MVP Speed, Demo-First, Skip Tests, Good Enough Architecture |
| Solo personal tool | Ship Fast Fix What Hurts, Build for Joy, Dogfood Relentlessly |
| Team project | Single Responsibility, Conventional Commits, Code Review Required |
| Long-lived system | Modularity, Documentation Standards, Semantic Versioning |
| High uptime (99%+) | Fail Fast & Loud, Graceful Degradation, Observability First |
| Public/multi-tenant | Zero Trust, Least Privilege, Input Validation Required |
| Financial/regulated | Security by Default, Audit Trails, No Silent Failures |
| CLI tool | Unix Philosophy, Text I/O Protocol, Predictable Exit Codes |
| Distributed system | CAP Awareness, Idempotency, Circuit Breaking |
| Complex domain | Domain-Driven Design (selective), Clear Naming |
| Fast iteration needed | YAGNI, KISS, Refactor When It Hurts |
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 7d ago First seen · 218 lines · 88 tokens per session scan A 5a3de8e15f94
constitution:writer is a skill published in the GitHub repository aaronbassett/agent-foundry (4 stars, last pushed 22d ago), licensed MIT. It adds 88 tokens to every session and 1,937 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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