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 agentmods add instructions/srnichols/plan-forge/project-principlesgit clone --depth 1 https://github.com/srnichols/plan-forgeWhat 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 | $0.00257 | $0.00257 |
| Opus 5 | $0.00129 | $0.00129 |
| Sonnet 5 | $0.00051 | $0.00051 |
| Haiku 4.5 | $0.00026 | $0.00026 |
Grade A, and why
plan-forge project-principles.instructions.md 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 2d 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.
What it actually says
Project Principles Guardrails
If docs/plans/PROJECT-PRINCIPLES.md exists in this project, it declares the
non-negotiable principles, technology commitments, and forbidden patterns
for this codebase.
Rules
- Read the Project Principles before proposing architectural changes
- Never violate a Core Principle — these are non-negotiable
- Never introduce a Forbidden Pattern — regardless of convenience
- Respect Technology Commitments — do not suggest alternatives to locked-in choices
- Flag potential violations — if a requested change might conflict with the Project Principles, cite the specific principle and ask before proceeding
Relationship to Other Guardrails
- Project Principles = what the project believes (human-authored declarations)
- Project Profile = how Copilot should write code (generated from interview)
- Architecture Principles = universal baseline (applies to all projects)
Project Principles take precedence when they conflict with generated guardrails.
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.
- 2d ago First seen · 30 lines · 257 tokens per session scan A 6fa7e42e1b4d
plan-forge project-principles.instructions.md is an instructions file published in the GitHub repository srnichols/plan-forge (5 stars, last pushed 22d ago), licensed MIT. It adds 257 tokens to every session, about $0.0013 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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