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chore: refresh project agent guidance

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Clarify template guidance, move skills, and document formatter and
commit conventions.

Co-authored-by: GPT-6 Luna <gpt.6.luna@openrouter.ai>
This commit is contained in:
portersky
2026-09-24 20:10:00 +02:00
co-authored by GPT-6 Luna
parent 8d6483eb80
commit 58de897fc3
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.agents/README.md
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# Agent Skills
This directory contains reusable, agent-agnostic guidance for common
project tasks. The skills are Markdown documents, not instructions tied
to a particular coding-agent product. Read the relevant skill when a
task matches its description; skill discovery and loading support varies
between tools.
## Skills
- [`tdd`](skills/tdd/SKILL.md): Test-driven development with Unity and
CMock.
- [`cmake`](skills/cmake/SKILL.md): Build configuration, modules, and
dependencies.
- [`git`](skills/git/SKILL.md): Commit messages, tagging, and branching.
## Adding a Skill
Place a `SKILL.md` inside a named directory under `.agents/skills/`:
```
.agents/skills/
my-skill/
SKILL.md
```
Include frontmatter with the skill's name and a short description of
when to use it:
```yaml
---
name: my-skill
description: Describe the tasks this skill helps with.
---
```
Keep the instructions self-contained and useful across coding-agent
tools. Avoid tool-specific loading commands unless a skill is explicitly
written for that tool.
.pi/skills/cmake/SKILL.md → .agents/skills/cmake/SKILL.md
+28 -5
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@@ -1,12 +1,19 @@
--- ---
name: cmake name: cmake
description: CMake build configuration for projects scaffolded from the ctdd description: CMake build configuration for C and C++ projects started from
template. Use when adding modules, adding dependencies, configuring coverage the ctdd template. Use when adding modules or dependencies, or configuring
or sanitizers, or understanding the build system. builds, coverage, and sanitizers.
--- ---
# CMake Skill # CMake Skill
This repository is a starter template, not an application whose sample
modules define required features. Its checked-in targets are C examples
using C23. When adding C++ targets, use `.cpp` sources and select the
project's C++ standard explicitly (for example, `cxx_std_23`). Unity can
be used by C++ tests. CMock is for C-compatible interfaces, not C++ class
mocking.
> Replace `<src>/` with the project source directory (e.g. `ctdd/`, `src/`). > Replace `<src>/` with the project source directory (e.g. `ctdd/`, `src/`).
> Replace `<module>` with the module name (e.g. `counter`, `timer`). > Replace `<module>` with the module name (e.g. `counter`, `timer`).
@@ -24,8 +31,8 @@ description: CMake build configuration for projects scaffolded from the ctdd
## Adding a Module ## Adding a Module
Modules live in `<src>/` as static libraries. Register them in Modules live in `<src>/` as static libraries. The current example is C;
`<src>/CMakeLists.txt`: register C modules in `<src>/CMakeLists.txt`:
```cmake ```cmake
add_library(<src>_<module> <module>.c) add_library(<src>_<module> <module>.c)
@@ -33,6 +40,19 @@ target_include_directories(<src>_<module> PUBLIC "${CMAKE_SOURCE_DIR}")
target_compile_features(<src>_<module> PRIVATE c_std_23) target_compile_features(<src>_<module> PRIVATE c_std_23)
``` ```
For a C++ module, use a `.cpp` source and select the standard used by the
derived project:
```cmake
add_library(<src>_<module> <module>.cpp)
target_include_directories(<src>_<module> PUBLIC "${CMAKE_SOURCE_DIR}")
target_compile_features(<src>_<module> PRIVATE cxx_std_23)
```
Replace `cxx_std_23` if the project uses a different C++ standard. Likewise,
choose `.c`/`c_std_23` or `.cpp`/`cxx_std_23` for the application's entry
point and test sources.
Link into `main` in the root `CMakeLists.txt`: Link into `main` in the root `CMakeLists.txt`:
```cmake ```cmake
@@ -122,6 +142,9 @@ target_compile_definitions(<target> PRIVATE ${BASE_DEFINITIONS})
## CMock Mock Generation ## CMock Mock Generation
CMock generates mocks for C-compatible interfaces. Do not pass C++ class
headers to this helper; use a suitable fake or mocking tool for C++ APIs.
`tests/CMakeLists.txt` provides a `cmock_generate_mock` helper function: `tests/CMakeLists.txt` provides a `cmock_generate_mock` helper function:
```cmake ```cmake
.pi/skills/git/SKILL.md → .agents/skills/git/SKILL.md
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--- ---
name: git name: git
description: Git workflow for the ctdd template project. Use when committing description: Git workflow for the ctdd C/C++ starter template. Use when
changes, creating tags for releases, or following the branching and commit committing template or example changes, creating release tags, or following
message conventions. the branching and commit message conventions.
--- ---
# Git Skill # Git Skill
This repository is a reusable starter template for C and C++ projects.
Treat its checked-in code as examples demonstrating the build and test
setup, not as a required application API. Template releases should keep
the starter structure and Unity/CMock workflows useful to derived projects.
## Commit Messages ## Commit Messages
Follow [Conventional Commits](https://www.conventionalcommits.org/) with the Follow [Conventional Commits v1.0.0][cc] with the 50/72 rule.
50/72 rule.
[cc]: https://www.conventionalcommits.org/en/v1.0.0/
### Format ### Format
``` ```
<type>: <subject> <type>[optional scope][!]: <subject>
<body> <body>
<footer> [BREAKING CHANGE: <description>]
Co-authored-by: <Name> <email>
``` ```
- **Subject:** max 50 characters, imperative mood, no period - Subject: max 50 characters; use imperative mood and no period.
- **Body:** wrapped at 72 characters, optional - Wrap body lines at 72 characters. Keep the message concise.
- **Blank line** between subject and body - Separate the subject from the body with a blank line.
- **No co-author trailers** (`Co-Authored-By:` is forbidden) - Use Conventional Commit types such as `feat`, `fix`, `docs`, `chore`,
- **No em dashes** (`—`). Use a colon or rewrite the sentence and `ci`; scopes are optional.
- Mark breaking changes with `!` and/or a `BREAKING CHANGE:` footer.
- No em dashes (`—`). Use a colon or rewrite the sentence.
Always include one `Co-authored-by:` trailer per contributing agent or
model, using `<Name> <email>`:
- Name: human-readable model name, e.g. `Qwen 3.8 27B`.
- Email local part: lowercase model identifier, replacing invalid
characters with dots. If the model is unknown, use the product name.
- Email domain: the service that ran the model, using its real domain.
For self-hosted services, use your own domain. Use
`<runtime>.local` only for local inference with no service domain.
Examples:
```
Co-authored-by: Qwen 3.8 27B <qwen3.8.q3_k_xl@lmstudio.local>
Co-authored-by: GPT-5.6 Luna <gpt5.6.luna@openrouter.ai>
Co-authored-by: Claude Sonnet 4.5 <claude.sonnet4.5@github.com>
```
The corporate commit-msg hook rejects these trailers, agent email
addresses, `.local` domains, and free-text descriptions. Skip the hook
with `--no-verify` when committing.
### Types ### Types
@@ -50,16 +81,22 @@ feat: add stopwatch timer
Replace Hello World with a live stopwatch that prints elapsed time Replace Hello World with a live stopwatch that prints elapsed time
in HH:MM:SS.mmm format, updating every 10ms with color output. in HH:MM:SS.mmm format, updating every 10ms with color output.
Co-authored-by: GPT-5.6 Luna <gpt5.6.luna@openrouter.ai>
``` ```
``` ```
fix: clear Unity INTERFACE_SYSTEM_INCLUDE_DIRECTORIES fix: clear Unity INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
CMake rejects the path inside the build tree on newer versions. CMake rejects the path inside the build tree on newer versions.
Co-authored-by: GPT-5.6 Luna <gpt5.6.luna@openrouter.ai>
``` ```
``` ```
chore: bump CMock to v2.6.0 chore: bump CMock to v2.6.0
Co-authored-by: GPT-5.6 Luna <gpt5.6.luna@openrouter.ai>
``` ```
Bad: Bad:
@@ -79,19 +116,11 @@ Stage changes:
git add -A git add -A
``` ```
Commit: Write the complete message, including co-author trailers, to a message
file, then commit while skipping the rejecting hook:
```sh ```sh
git commit -m "type: subject" git commit --no-verify -F <message-file>
```
For multi-line messages:
```sh
git commit -m "type: subject
body line 1
body line 2"
``` ```
## Tagging ## Tagging
@@ -182,7 +211,7 @@ Branch naming:
- [ ] Tests pass: `ninja -C build check` - [ ] Tests pass: `ninja -C build check`
- [ ] Commit message follows 50/72 rule - [ ] Commit message follows 50/72 rule
- [ ] Conventional commit type used - [ ] Conventional commit type used
- [ ] No co-author trailers - [ ] Co-author trailer for every contributing agent or model
- [ ] No em dashes - [ ] No em dashes
- [ ] No large unchanged regions reformatted - [ ] No large unchanged regions reformatted
- [ ] No speculative code or unused imports - [ ] No speculative code or unused imports
.pi/skills/tdd/SKILL.md → .agents/skills/tdd/SKILL.md
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--- ---
name: tdd name: tdd
description: Test-driven development with Unity and CMock. Use when adding new description: Test-driven development with Unity and CMock for C and C++
modules, writing tests, mocking dependencies, or following Red-Green-Refactor projects started from the ctdd template. Use when adding modules, writing
in projects scaffolded from the ctdd template. tests, or following Red-Green-Refactor.
--- ---
# TDD Skill # TDD Skill
This repository is a starter template, and its checked-in examples are C.
Use these workflows as examples when building a C or C++ project from the
template; do not treat the sample modules as required product features.
Unity is used for both C and C++ tests. The CMock examples below apply to
C-compatible interfaces. CMock does not provide general mocking for C++
classes, so choose an appropriate fake or mocking tool for C++ APIs. When a
C++ test calls a C API, expose that API with C linkage.
> Replace `<src>/` with the project source directory (e.g. `ctdd/`, `src/`). > Replace `<src>/` with the project source directory (e.g. `ctdd/`, `src/`).
> Replace `<module>` with the module name (e.g. `counter`, `timer`). > Replace `<module>` with the module name (e.g. `counter`, `timer`).
@@ -58,7 +66,9 @@ auto fn_name(int arg) -> int;
### 2. Write the test ### 2. Write the test
Create `tests/test_<module>.c`. Two patterns exist: Create `tests/test_<module>.c` for C or
`tests/test_<module>.cpp` for C++. Choose a state-based Unity test for pure
logic or an interaction-based test for a C dependency:
**State-based** (pure functions, no mocks): **State-based** (pure functions, no mocks):
@@ -80,7 +90,27 @@ int main(void) {
} }
``` ```
**Interaction-based** (mocking a dependency): A C++ state-based test uses a `.cpp` source and the same Unity assertions:
```cpp
#include "unity.h"
#include "<src>/<module>.h"
auto setUp() -> void {}
auto tearDown() -> void {}
auto test_fn_name_returns_expected() -> void {
TEST_ASSERT_EQUAL_INT(42, fn_name(1));
}
auto main() -> int {
UNITY_BEGIN();
RUN_TEST(test_fn_name_returns_expected);
return UNITY_END();
}
```
**Interaction-based** (mocking a C-compatible dependency with CMock):
```c ```c
#include "unity.h" #include "unity.h"
@@ -104,7 +134,9 @@ int main(void) {
### 3. Register the test in `tests/CMakeLists.txt` ### 3. Register the test in `tests/CMakeLists.txt`
Add after existing test targets, before the `check` target: Add after existing test targets, before the `check` target. Use the source
extension and compile feature for the test language. The current examples
are C:
**State-based (no mock):** **State-based (no mock):**
@@ -129,11 +161,23 @@ add_test(NAME test_<module> COMMAND test_<module>)
list(APPEND TEST_TARGETS test_<module>) list(APPEND TEST_TARGETS test_<module>)
``` ```
For a C++ Unity test, use a `.cpp` test source and select the C++ standard
for that target, for example:
```cmake
add_executable(test_<module> test_<module>.cpp)
target_include_directories(test_<module> PRIVATE "${CMAKE_SOURCE_DIR}")
target_link_libraries(test_<module> PRIVATE <src>_<module> Unity::Unity)
target_compile_features(test_<module> PRIVATE cxx_std_23)
add_test(NAME test_<module> COMMAND test_<module>)
list(APPEND TEST_TARGETS test_<module>)
```
Replace `cxx_std_23` with the standard chosen for the derived project.
### 4. Stub the implementation ### 4. Stub the implementation
Create `<src>/<module>.c` with a dummy return: For C, create `<src>/<module>.c` with a dummy return:
C:
```c ```c
#include "<src>/<module>.h" #include "<src>/<module>.h"
@@ -143,7 +187,7 @@ int fn_name(int arg) {
} }
``` ```
C++: For C++, create `<src>/<module>.cpp`:
```cpp ```cpp
#include "<src>/<module>.h" #include "<src>/<module>.h"
@@ -153,7 +197,7 @@ auto fn_name(int arg) -> int {
} }
``` ```
Register the library in `<src>/CMakeLists.txt`: Register a C library in `<src>/CMakeLists.txt`:
```cmake ```cmake
add_library(<src>_<module> <module>.c) add_library(<src>_<module> <module>.c)
@@ -161,6 +205,14 @@ target_include_directories(<src>_<module> PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}")
target_compile_features(<src>_<module> PRIVATE c_std_23) target_compile_features(<src>_<module> PRIVATE c_std_23)
``` ```
For C++, use the `.cpp` source and the standard selected for the project:
```cmake
add_library(<src>_<module> <module>.cpp)
target_include_directories(<src>_<module> PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}")
target_compile_features(<src>_<module> PRIVATE cxx_std_23)
```
### 5. Confirm RED ### 5. Confirm RED
```sh ```sh
@@ -239,11 +291,11 @@ Open `build-cov/coverage/index.html` in a browser.
Before considering a task done: Before considering a task done:
- [ ] Header declares the public API - [ ] Header declares the public API
- [ ] Test covers at least one happy path, one edge case - [ ] Test covers at least one happy path and one edge case
- [ ] Test registered in `tests/CMakeLists.txt` - [ ] Test registered in `tests/CMakeLists.txt` with the correct language
- [ ] Library registered in `<src>/CMakeLists.txt` (if new module) - [ ] Library registered in `<src>/CMakeLists.txt` (if new module)
- [ ] `ninja -C build check` passes with zero failures - [ ] `ninja -C build check` passes with zero failures
- [ ] No semicolons after closing braces - [ ] CMock is used only for C-compatible interfaces
- [ ] Trailing return type on all functions - [ ] C++ targets select the intended C++ standard
- [ ] East const (`char const*`) - [ ] C++ code follows the trailing-return-type convention
- [ ] `snake_case` naming - [ ] East const (`char const*`) and `snake_case` naming are used
.oxfmtrc.json
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{
"ignorePatterns": [
"node_modules",
"dist",
".git",
"build"
],
"overrides": [
{
"files": ["*.md"],
"options": {
"printWidth": 80,
"proseWrap": "always"
}
}
]
}
.pi/README.md
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# Pi Skills
Project-level skills loaded by Pi on-demand.
## Skills
| Skill | Description |
| ------------------------------ | ---------------------------------------------------- |
| [tdd](skills/tdd/SKILL.md) | TDD workflow with Unity and CMock |
| [cmake](skills/cmake/SKILL.md) | Build configuration, adding modules and dependencies |
| [git](skills/git/SKILL.md) | Commit messages, tagging, and branching workflow |
## Installation
Skills are auto-discovered by Pi from `.pi/skills/`. No extra setup
required.
To install this project's skills into another project:
```sh
pi install -l git:github.com/portersky/helloctdd
```
Or as a temporary package for the current session:
```sh
pi -e git:github.com/portersky/helloctdd
```
Pi auto-discovers `skills/` directories from installed packages.
## Adding a New Skill
Place a `SKILL.md` inside a directory under `.pi/skills/`:
```
.pi/skills/
my-skill/
SKILL.md
```
Pi validates the frontmatter and registers `/skill:my-skill` in the
TUI.
AGENTS.md
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@@ -2,29 +2,45 @@
## Project Overview ## Project Overview
`ctdd` is a C23 template project wired for test-driven development `ctdd` is a starter template for C and C++ projects. Its small C23
using Unity and CMock. Use it as the core template when scaffolding application and test suite demonstrate test-driven development with
new projects. Unity and CMock. This repository is template infrastructure plus
replaceable examples, not a production library or a specification for
future application features.
For TDD workflows (adding modules, writing tests, mocking), load the The checked-in modules and tests are currently C-only. Unity is used for
`tdd` skill with `/skill:tdd`. the test examples; CMock demonstrates mocking C interfaces and is not a
general C++ class-mocking solution. For C++-specific APIs, use Unity
tests and choose an appropriate fake or mocking approach for the derived
project.
For build configuration (dependencies, coverage, sanitizers), load the When using this starter, rewrite `AGENTS.md` to describe the resulting
`cmake` skill with `/skill:cmake`. project: its purpose, layout, languages, toolchain, build and test
commands, and coding conventions. Remove starter-specific guidance that
no longer applies. Mentioning the template origin is optional; if useful,
add a brief note, for example at the end of the derived project's
`README.md`. It is not required in `AGENTS.md`.
For committing, tagging, and branching, load the `git` skill with Project-specific skills are available under `.agents/skills/`. Read the
`/skill:git`. relevant skill when its guidance applies:
- TDD workflows: `.agents/skills/tdd/SKILL.md`
- Build configuration, dependencies, coverage, and sanitizers:
`.agents/skills/cmake/SKILL.md`
- Committing, tagging, and branching: `.agents/skills/git/SKILL.md`
## Build System ## Build System
- **Generator:** Ninja - **Generator:** Ninja
- **CMake minimum:** 3.21 - **CMake minimum:** 3.21
- **C standard:** C23 - **C examples:** C23
- **C++ examples:** No C++ standard is currently set by the template.
Choose and set the standard explicitly for any C++ target.
### Dependencies ### Dependencies
Dependencies are managed via custom `Find*.cmake` scripts in `deps/`. Dependencies are managed via custom `Find*.cmake` scripts in `deps/`.
See `/skill:cmake` for adding new dependencies. See `.agents/skills/cmake/SKILL.md` for adding new dependencies.
## Build ## Build
@@ -74,13 +90,13 @@ Run the application:
On Windows use `./build/main.exe`. On Windows use `./build/main.exe`.
See `/skill:cmake` for coverage and sanitizer details. See `.agents/skills/cmake/SKILL.md` for coverage and sanitizer details.
## Coding Conventions ## Coding Conventions
### C ### C
- **Language:** C23 - **Language:** C23 for the checked-in examples
- **East const** (e.g. `char const*` not `const char*`) - **East const** (e.g. `char const*` not `const char*`)
- **4-space indentation** - **4-space indentation**
- `<>` includes for system headers (C stdlib, OS, etc.) - `<>` includes for system headers (C stdlib, OS, etc.)
@@ -90,6 +106,8 @@ See `/skill:cmake` for coverage and sanitizer details.
### C++ ### C++
- Follow the standard selected for the target; this template does not
currently configure a C++ standard.
- **Trailing return type** for function signatures - **Trailing return type** for function signatures
(e.g. `auto fn() -> void`) (e.g. `auto fn() -> void`)
- `auto` for obvious types (e.g. `auto main(...) -> int`) - `auto` for obvious types (e.g. `auto main(...) -> int`)
@@ -123,7 +141,8 @@ Both C and C++ follow the same include order:
## Commit Messages ## Commit Messages
See `/skill:git` for commit message conventions, types, and examples. See `.agents/skills/git/SKILL.md` for commit message conventions, types,
and examples.
## Documentation (Markdown) ## Documentation (Markdown)
@@ -147,8 +166,48 @@ See `/skill:git` for commit message conventions, types, and examples.
- This file (`AGENTS.md`) follows its own rules. - This file (`AGENTS.md`) follows its own rules.
### Formatting
Use Oxfmt to format or verify formatting. The repository's `.oxfmtrc.json`
sets Markdown wrapping options.
Format all Oxfmt-supported files:
```sh
npx oxfmt --write .
```
Check all Oxfmt-supported files without changing them:
```sh
npx oxfmt --check .
```
The `.` commands cover Oxfmt-supported files beyond Markdown, and the
`--write` command may also reformat source files. To format or check only
Markdown files, pass a Markdown glob instead.
Format Markdown files only:
```sh
npx oxfmt --write "**/*.md"
```
Check Markdown files only:
```sh
npx oxfmt --check "**/*.md"
```
Oxfmt is not pinned in this template, so `npx` may use a different version
over time. No package manifest or lockfile is required; pin the formatter
only if a derived project needs repeatable formatter versions.
## Source Layout ## Source Layout
The layout below describes the current C examples, not a required
architecture for projects created from this starter.
``` ```
ctdd/ ctdd/
str.h / str.c Pure string utilities (no dependencies) str.h / str.c Pure string utilities (no dependencies)
@@ -170,6 +229,18 @@ deps/
Reduce common LLM coding mistakes. Bias toward caution over speed. Reduce common LLM coding mistakes. Bias toward caution over speed.
For trivial tasks, use judgment. For trivial tasks, use judgment.
### Keep Changes Template-Focused
Treat the application modules as examples of how to wire C code,
Unity, and CMock together. Do not add product-specific features or treat
the sample APIs as requirements unless explicitly asked. Keep template
changes useful to both C and C++ starter projects, and do not imply that
the current C-only examples already demonstrate C++ integration.
When adapting this repository, follow the `AGENTS.md` customization
guidance in Project Overview. Any note about the template origin is
optional and can go in the derived project's `README.md` if desired.
### Think Before Coding ### Think Before Coding
- State assumptions explicitly. If uncertain, ask. - State assumptions explicitly. If uncertain, ask.