Aoti Debug
pytorch/pytorch
Debug AOTInductor (AOTI) errors and crashes. An agent skill from pytorch/pytorch.
How to get debug output out of OCANNL: kernel/routine runtime logs, generated code artifacts, and ppxminidebug tracing of library internals such as the shape/row solver.
Install Ocannl Debug Tracing
$ npx skills add ahrefs/ocannl --skill ocannl-debug-tracing -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ahrefs/ocannl ocannl-debug-tracing --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/ahrefs/ocannl.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/ocannl-debug-tracing .claude/skills/ocannl-debug-tracing && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "ocannl-debug-tracing" agent skill from https://github.com/ahrefs/ocannl/tree/master/.claude/skills/ocannl-debug-tracing into .claude/skills/ocannl-debug-tracing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ocannl-debug-tracing", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/ahrefs/ocannl/tree/master/.claude/skills/ocannl-debug-tracingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add ahrefs/ocannl --skill ocannl-debug-tracing -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ahrefs/ocannl ocannl-debug-tracing --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ahrefs/ocannl.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/ocannl-debug-tracing .agents/skills/ocannl-debug-tracing && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "ocannl-debug-tracing" agent skill from https://github.com/ahrefs/ocannl/tree/master/.claude/skills/ocannl-debug-tracing into .agents/skills/ocannl-debug-tracing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ocannl-debug-tracing", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ahrefs/ocannl --skill ocannl-debug-tracing -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ahrefs/ocannl ocannl-debug-tracing --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ahrefs/ocannl.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/ocannl-debug-tracing .cursor/skills/ocannl-debug-tracing && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "ocannl-debug-tracing" agent skill from https://github.com/ahrefs/ocannl/tree/master/.claude/skills/ocannl-debug-tracing into .cursor/skills/ocannl-debug-tracing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ocannl-debug-tracing", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/ahrefs/ocannl.git --path .claude/skills/ocannl-debug-tracing--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add ahrefs/ocannl --skill ocannl-debug-tracing -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ahrefs/ocannl ocannl-debug-tracing --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ahrefs/ocannl.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/ocannl-debug-tracing .gemini/skills/ocannl-debug-tracing && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "ocannl-debug-tracing" agent skill from https://github.com/ahrefs/ocannl/tree/master/.claude/skills/ocannl-debug-tracing into .gemini/skills/ocannl-debug-tracing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ocannl-debug-tracing", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install ahrefs/ocannl ocannl-debug-tracingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add ahrefs/ocannl --skill ocannl-debug-tracing -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ahrefs/ocannl.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/ocannl-debug-tracing .github/skills/ocannl-debug-tracing && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "ocannl-debug-tracing" agent skill from https://github.com/ahrefs/ocannl/tree/master/.claude/skills/ocannl-debug-tracing into .github/skills/ocannl-debug-tracing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ocannl-debug-tracing", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ahrefs/ocannl --skill ocannl-debug-tracing -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ahrefs/ocannl ocannl-debug-tracing --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ahrefs/ocannl.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/ocannl-debug-tracing .opencode/skills/ocannl-debug-tracing && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "ocannl-debug-tracing" agent skill from https://github.com/ahrefs/ocannl/tree/master/.claude/skills/ocannl-debug-tracing into .opencode/skills/ocannl-debug-tracing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ocannl-debug-tracing", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
ocannl-debug-tracing- GitHub stars
- 118
- Token cost
- ~637 tokens
- SKILL.md length
- 249 words
- Files
- 1
- Skills in repo
- 3
- Repo updated
- First seen
- Licence
- BSD-2-Clause
At a glance
How to get debug output out of OCANNL: kernel/routine runtime logs, generated code artifacts, and ppxminidebug tracing of library internals such as the shape/row solver.
- Debugging a wrong-value
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Wrong-shape result and you need to see generated code
- Per-kernel logs
What it does
Ocannl Debug Tracing is an agent skill from ahrefs/ocannl. How to get debug output out of OCANNL: kernel/routine runtime logs, generated code artifacts, and ppxminidebug tracing of library internals such as the shape/row solver. Use when debugging a wrong-value or wrong-shape result and you need to see generated code, per-kernel logs, or the solver's decisions.
Its SKILL.md is about 640 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Debugging and Deep learning. The repository describes itself as: OCANNL: OCaml Compiles Algorithms for Neural Networks Learning. The licence is BSD-2-Clause.
When your agent uses it
- Debugging a wrong-value
- Wrong-shape result and you need to see generated code
- Per-kernel logs
- The solvers decisions
Example prompts
- “/ocannl-debug-tracing”
What it can do on your machine
Read from SKILL.md and the folder at commit 003e177. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Ocannl Debug Tracing loads about 637 tokens when it runs. Until then it costs about 82 tokens; SKILL.md has 249 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from ahrefs/ocannl at commit 003e177, republished under its BSD-2-Clause licence (© ahrefs). 249 words, ~637 tokens.
Download SKILL.mdSave it as
.claude/skills/ocannl-debug-tracing/SKILL.md (or your agent's skills folder).- name
- ocannl-debug-tracing
- description
- How to get debug output out of OCANNL: kernel/routine runtime logs, generated code artifacts, and ppx_minidebug tracing of library internals such as the shape/row solver. Use when debugging a wrong-value or wrong-shape result and you need to see generated code, per-kernel logs, or the solver's decisions.
Debugging and Logging
- Set
debug_log_from_routines=truein config for kernel/routine-level debugging - Use
log_level=2for verbose ppx_minidebug output - CUDA debugging requires
Utils.capture_stdout_logswrapper - Debug files generated in
log_files/<exe-name>/(this process's subdirectory is cleaned on startup by default) - Runtime logs from kernel execution are written to
<backend>-<device>-<stream>.log(e.g.,cuda-0-0.log) inside that subdirectory - Generated code files in
build_files/<exe-name>/show high-level.cd, intermediate.ll, and backend-specific.c/.cufiles
See the Important Debug Settings list in AGENTS.md for the config keys that enable these artifacts.
Tracing library internals with ppx_minidebug (e.g. the shape/row solver)
- High-level
%debug5_sexp/%track5_sexpetc. log statements are stripped at COMPILE time; each module has its own gate env var:[%%global_debug_log_level_from_env_var "OCANNL_LOG_LEVEL_ROW"]at the top ofrow.ml, similarly..._SHAPE,..._TNODE,..._ASSIGNMENTS,..._CC_BACKEND, etc. (grep forglobal_debug_log_level_from_env_var) - Every gate is declared as a
preprocessor_deps(env_var ...)of the library whose modules read it (gh-ocannl-628), so setting one re-preprocesses those modules by itself:OCANNL_LOG_LEVEL_ROW=9 OCANNL_LOG_LEVEL_SHAPE=9 dune build .... Adding a gate to a module means adding it to that library'spreprocessor_depstoo, whichtest/operations/env_var_depschecks - At runtime, pass
--ocannl_log_level=9and run from a directory with anocannl_configon its ancestor path (e.g.test/config/); logs land inlog_files/ - Backend choice: the default
debug_backend=dbwrites a database supporting structured queries (e.g. print a subtree containing two given terms);--ocannl_debug_backend=flushingwrites greppable flat text tolog_files/debug.logand survives crashes mid-trace - Useful flat-text queries:
stage = StageNlines segmentfinish_inference's solver passes; track a variable by greppingRow_var N/(id N)for its transition toSolved_row/Solved_dim, then inspect the surroundingunify_row/solve_dim_ineqscope
© ahrefs, BSD-2-Clause. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .claude/skills/ocannl-debug-tracing of ahrefs/ocannl.
Open the folder on GitHubat commit 003e177
Compare with similar skills
Ocannl Debug Tracing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Ocannl Debug Tracing this skillahrefs/ocannl | 118 | — | ~637 | Automated safety check: Pass | BSD-2-Clause | |
| Aoti Debugpytorch/pytorch | 104k | 1 repos | ~1.7k | Automated safety check: Pass | Custom licence | |
| Debug Distributedareal-project/AReaL | 5.8k | 1 repos | ~1.6k | Automated safety check: Pass | Apache-2.0 | |
| The Art of Debuggingstas00/the-art-of-debugging | 1.7k | — | ~6.1k | Automated safety check: Notes | CC-BY-SA-4.0 | |
| Veomni DebugByteDance-Seed/VeOmni | 2.2k | — | ~2.8k | Automated safety check: Pass | Apache-2.0 | |
| Analyze Projectlllllllama/RigorPilot-Skills | 497 | 1 repos | ~519 | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Ocannl Debug Tracing
What does Ocannl Debug Tracing do?
How to get debug output out of OCANNL: kernel/routine runtime logs, generated code artifacts, and ppxminidebug tracing of library internals such as the shape/row solver. Ocannl Debug Tracing is an agent skill from ahrefs/ocannl. How to get debug output out of OCANNL: kernel/routine runtime logs, generated code artifacts, and ppxminidebug tracing of library internals such as the shape/row solver.
When should I use Ocannl Debug Tracing?
Ocannl Debug Tracing fits situations like: debugging a wrong-value; wrong-shape result and you need to see generated code; per-kernel logs; the solvers decisions.
How do I install Ocannl Debug Tracing in Claude Code?
Run `npx skills add ahrefs/ocannl --skill ocannl-debug-tracing -a claude-code`. Or copy the skill folder (.claude/skills/ocannl-debug-tracing in ahrefs/ocannl) into .claude/skills/ocannl-debug-tracing in your project. Claude Code loads it when a task matches its description.
How do I install Ocannl Debug Tracing in Codex?
Run `npx skills add ahrefs/ocannl --skill ocannl-debug-tracing -a codex`. Or copy the skill folder (.claude/skills/ocannl-debug-tracing in ahrefs/ocannl) into .agents/skills/ocannl-debug-tracing in your project. Codex loads it when a task matches its description.
Can I use Ocannl Debug Tracing in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ahrefs/ocannl --skill ocannl-debug-tracing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ocannl-debug-tracing, .gemini/skills/ocannl-debug-tracing, .github/skills/ocannl-debug-tracing and .opencode/skills/ocannl-debug-tracing in your project.
What does Ocannl Debug Tracing need to run?
SKILL.md names no scripts, command-line tools or credentials: Ocannl Debug Tracing is instructions for the agent only.
Does Ocannl Debug Tracing access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Ocannl Debug Tracing safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Ocannl Debug Tracing use?
Ocannl Debug Tracing is published under the BSD-2-Clause licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Ocannl Debug Tracing use?
About 637 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Ocannl Debug Tracing?
Skills that share tags, products or a category with Ocannl Debug Tracing: Aoti Debug (pytorch/pytorch, 104k stars), Debug Distributed (areal-project/AReaL, 5.8k stars), The Art of Debugging (stas00/the-art-of-debugging, 1.7k stars) and Veomni Debug (ByteDance-Seed/VeOmni, 2.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Ocannl Debug Tracing?
ahrefs (a GitHub organization) maintains it in ahrefs/ocannl, which has 118 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on October 7, 2026.
Source: ahrefs/ocannl on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.