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/michaelsuen-thepointer/fixmath/agents-mdgit clone --depth 1 https://github.com/MichaelSuen-thePointer/fixmathWhat 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 | $0.00957 | $0.00957 |
| Opus 5 | $0.00478 | $0.00478 |
| Sonnet 5 | $0.00191 | $0.00191 |
| Haiku 4.5 | $0.00096 | $0.00096 |
Grade A, and why
fixmath AGENTS.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.
How it starts
The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repository Guidelines
Project Structure & Module Organization
Fixmath is a header-only C++20 fixed-point arithmetic library. Public headers live in include/fixmath/; fixed.hpp is the main entry point, fixed_impl.inl and fixed_math.inl contain core operations, and the remaining .inl files provide traits, bit utilities, and platform-independent 128-bit helpers. Tests are consolidated in tests/unit_tests.cpp. The tests/CMakeLists.txt project downloads GoogleTest during configuration and builds the FIXMATH_unittests executable. GitHub Actions configuration is under .github/workflows/.
Build, Test, and Development Commands
Run commands from the repository root:
cmake -S tests -B build -DCMAKE_BUILD_TYPE=Debug
cmake --build build --config Debug
ctest --test-dir build -C Debug --output-on-failure
The first command configures the test project and fetches GoogleTest, so network access is required on a clean build. The second compiles the C++20 tests. The final command runs all discovered GoogleTest cases and prints failure details. Use a separate build directory (for example, build-release) rather than adding generated files to the source tree.
Format all C++ sources and verify that no formatting changes remain before committing. In PowerShell:
$files = rg --files -g '*.hpp' -g '*.h' -g '*.inl' -g '*.cpp' -g '*.cc' -g '*.cxx'
clang-format -i $files
clang-format --dry-run --Werror $files
The repository .clang-format file is the source of truth. It targets clang-format 19 or a compatible newer version.
Keep C and C++ source files encoded as UTF-8 with BOM.
Whenever .clang-format changes, first ensure that C and C++ files contain no uncommitted behavioral changes, restore
those files to HEAD, and then format the repository again. Do not layer a new formatting configuration over output
produced by the previous configuration.
Coding Style & Naming Conventions
Match the surrounding C++ style: tabs for indentation, a maximum line length of 300 characters, braces on the
same line as declarations, and snake_case for functions, variables, and implementation headers. Types use descriptive
names such as fixed_policy; compile-time constants use UPPER_SNAKE_CASE. Internal helpers currently use the _fm_
prefix. Keep public declarations in .hpp files and template implementations in .inl files. Preserve the MPL 2.0
notice at the top of source files. Use .clang-format for automatic formatting and minimize unrelated 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.
- 2d ago First seen · 62 lines · 957 tokens per session scan A 2ca4f360bcb8
fixmath AGENTS.md is an instructions file published in the GitHub repository MichaelSuen-thePointer/fixmath (22 stars, last pushed 9d ago), licensed MPL-2.0. It adds 957 tokens to every session, about $0.0048 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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