Borrowing it
Nothing to install: this file belongs to Beneficial-AI-Foundation/FloatSpec. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Beneficial-AI-Foundation/FloatSpec/main/CLAUDE.mdgit clone --depth 1 https://github.com/Beneficial-AI-Foundation/FloatSpecWrote 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/instructions/beneficial-ai-foundation/floatspec/claude-md)<a href="https://agentmods.dev/instructions/beneficial-ai-foundation/floatspec/claude-md"><img src="https://agentmods.dev/badge/instructions/beneficial-ai-foundation/floatspec/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/beneficial-ai-foundation/floatspec/claude-md"><img src="https://agentmods.dev/badge/instructions/beneficial-ai-foundation/floatspec/claude-md.svg" alt="Reviewed on agentmods" width="80" 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 | $0.07737 | $0.07737 |
| Opus 5 | $0.03868 | $0.03868 |
| Sonnet 5 | $0.01547 | $0.01547 |
| Haiku 4.5 | $0.00774 | $0.00774 |
Grade A, and why
FloatSpec CLAUDE.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 11d 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 — 608 lines — stays where its author put it; the contents beside it link to each section on GitHub.
FloatSpec Project Overview
You are a functional programmer working in Lean 4.
Main Goal: Create a provable Lean float implementation with formal verification. Use bootstrapping from feedback like compiler error messages to guide development.
IMPORTANT: "Keep Going" Context
If you're told to "keep going" without context, you're likely working on:
- Float Implementation - Developing provable floating-point arithmetic
- Specification Writing - Creating formal specifications for float operations
- Test Writing - Add more property-based tests using Plausible
General Programming Philosophy
Programming is about onomastics (naming), composition (functoriality), and caching. Think conformally at every scale and across scales.
Build a pit of success: internal systems that grow as a whole outwards, never allowing the fallible external world to leak in except at boundaries. Meet the external world at well-defined interfaces.
When solving problems, write tooling/linters/auto-fixers to widen the pit of success. Use rigid compiler error messages and linter warnings to guide future users (including AI) toward correct solutions.
Favor statically typed functional programming but use mutability where it makes sense or is easier to port.
Project Structure
FloatSpec.leanandFloatSpec/directory - core float functionality and specifications.lakefile.lean- Lean 4 project configuration.
Development Commands
just is our main program runner. It provides a unified interface for all common development tasks. Run just without arguments to see all available commands.
Key commands:
just build- Build Lean projectjust test- Run the Python test suitejust bootstrap- Bootstrap developer environment (Rust, Elan, UV)
You can also run underlying tools directly:
lake build- Build Lean project (use frequently for constant feedback)uv run -m pytest- Run Python tests directly
Commit Logging Process
After making a commit, create a log entry:
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.
- 11d ago First seen · 608 lines · 7,737 tokens per session scan A 38a211098dcc
FloatSpec CLAUDE.md is an instructions file published in the GitHub repository Beneficial-AI-Foundation/FloatSpec (21 stars, last pushed yesterday), licensed Apache-2.0. It adds 7,737 tokens to every session, about $0.0387 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 2026-08-30.
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