hs-to-rocq: Instructions file for Claude Code

CLAUDE.md

hs-to-rocq CLAUDE.md is an instructions file for Claude Code from plclub/hs-to-rocq. It costs 9,560 tokens per session, scanned B, original, MIT.

A project guide for hs-to-rocq, a tool that converts Haskell source code into Coq code for formal proofs. Haskell is a programming language, while Coq is a system for writing and checking mathematical proofs.

In plain words
What is it for?
Use it to build the converter, translate Haskell files into Coq files, regenerate example libraries, and run tests that compile the generated proofs.
Why use it?
It explains the project’s build targets, conversion process, and test commands so contributors can work across both languages without guessing.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions Claude Code.

This is plclub/hs-to-rocq's own configuration. It tells Claude Code how to work on hs-to-rocq itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything hs-to-rocq configures →

Reuse

Borrowing it

Nothing to install: this file belongs to plclub/hs-to-rocq. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/plclub/hs-to-rocq/master/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/plclub/hs-to-rocq

Made for: Claude Code.

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Per session 9,560 This file is loaded in full into every session.
When invoked 9,560 The same file — it is already loaded in full.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.09560 $0.09560
Opus 5.5 $0.03824 $0.03824
Sonnet 5.5 $0.01912 $0.01912
Haiku 4.5 $0.00956 $0.00956

Measured today against content hash 0a13c2948bad, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

hs-to-rocq CLAUDE.md scanned grade B with 1 finding 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 today.

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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

**Container job gotcha**: Container jobs use `--allow-different-user` for stack commands (ownership mismatch between host-mounted workspace and container user). For docker-coq-action, use `before_script` with `sudo chown
CLAUDE.md · 275 lines

How it starts

The opening of the file, as written. The whole thing — 275 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

hs-to-rocq converts Haskell source code to Coq (Gallina) using the GHC API. It is part of the DeepSpec/CoreSpec project. The tool parses Haskell via GHC, applies user-specified "edits" to guide the translation, and pretty-prints valid Coq output.

  • Current targets: GHC 9.10.3; Coq 8.20 (default) or Rocq 9.0 via --target-version (branch ghc910-coq820)
  • Languages: Haskell (the tool, ~14K LOC in src/), Coq (generated output and proofs)

Build Commands

stack build                                    # Build hs-to-rocq executable
stack exec hs-to-rocq -- -e edits -o output/ Input.hs  # Run on a file
make                                           # Build base + base-thy + containers
make -C examples/base-src vfiles               # Re-generate base/ from Haskell sources
make -C examples/tests                         # Unit tests (.hs → .v → coqc)
make -C examples/base-tests                    # Tests requiring base/
make -C examples/rocq9.0                       # Rocq 9.0 base + shared unit tests
make -C examples/containers                    # containers lib + theories (regenerates + builds)
make -C examples/transformers                   # transformers lib
make -C examples/ghc clean && make -C examples/ghc  # Regenerate+compile GHC lib + theories
cd examples && ./boot.sh                       # Full bootstrap (all examples)
# Individual Coq dirs: cd <dir> && coq_makefile -f _CoqProject -o Makefile && make -j

Use relative path instead of absolute path when cd to a directory.

CI commands

  • /ci — run CI checks locally, report pass/fail
  • /ci-fix — run CI checks, diagnose and fix failures, commit fixes

Both commands use .claude/commands/ci.md as their shared catalog of all seven workflow jobs, including direct, harness, concurrent, and both Rocq checks. The compiler jobs use separate Coq 8.20 and Rocq 9.0 environments. Expected test failures already return zero; every nonzero Make status needs investigation. When changing either command or the workflow, run stack exec -- runghc -package=yaml examples/tests/checks/CiCatalog.hs --self-test. This build-haskell guard checks catalog coverage, delegation, failure masking, shell syntax, and regressions without running the documented builds.

Read the full file on GitHub · 275 lines

Changes

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.

  1. today Changed · +60 lines · +3,551 tokens per session 0a13c2948bad
  2. 1mo ago First seen · 215 lines · 6,009 tokens per session scan B 139c9c3ee4fe

Subscribe to this mod's changes

hs-to-rocq CLAUDE.md is an instructions file published in the GitHub repository plclub/hs-to-rocq (96 stars, last pushed yesterday), licensed MIT. It adds 9,560 tokens to every session, about $0.0382 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-01.

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