Agent skill

Extempore JIT Debugging Guide

Debugging guide for Extempore covering its three layers, compilation paths, startup sequence and the batch, eval and interactive modes used to isolate JIT problems.

No licenceAuto-check passedDevelopment

Install Extempore JIT Debugging Guide

skills CLI

$ npx skills add digego/extempore --skill extempore-debugging -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install digego/extempore extempore-debugging --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/digego/extempore.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/extempore-debugging .claude/skills/extempore-debugging && rm -rf skills-src

Use ~/.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/

Paste into Claude Code

Install the "extempore-debugging" agent skill from https://github.com/digego/extempore/tree/master/.claude/skills/extempore-debugging into .claude/skills/extempore-debugging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extempore-debugging", 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

$skill-installer install https://github.com/digego/extempore/tree/master/.claude/skills/extempore-debugging

Type 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.

skills CLI

$ npx skills add digego/extempore --skill extempore-debugging -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install digego/extempore extempore-debugging --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/digego/extempore.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/extempore-debugging .agents/skills/extempore-debugging && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "extempore-debugging" agent skill from https://github.com/digego/extempore/tree/master/.claude/skills/extempore-debugging into .agents/skills/extempore-debugging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extempore-debugging", 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.

skills CLI

$ npx skills add digego/extempore --skill extempore-debugging -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install digego/extempore extempore-debugging --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/digego/extempore.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/extempore-debugging .cursor/skills/extempore-debugging && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "extempore-debugging" agent skill from https://github.com/digego/extempore/tree/master/.claude/skills/extempore-debugging into .cursor/skills/extempore-debugging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extempore-debugging", 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

$ gemini skills install https://github.com/digego/extempore.git --path .claude/skills/extempore-debugging

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add digego/extempore --skill extempore-debugging -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install digego/extempore extempore-debugging --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/digego/extempore.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/extempore-debugging .gemini/skills/extempore-debugging && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "extempore-debugging" agent skill from https://github.com/digego/extempore/tree/master/.claude/skills/extempore-debugging into .gemini/skills/extempore-debugging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extempore-debugging", 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.

GitHub CLI

$ gh skill install digego/extempore extempore-debugging

Installs 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).

skills CLI

$ npx skills add digego/extempore --skill extempore-debugging -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/digego/extempore.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/extempore-debugging .github/skills/extempore-debugging && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "extempore-debugging" agent skill from https://github.com/digego/extempore/tree/master/.claude/skills/extempore-debugging into .github/skills/extempore-debugging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extempore-debugging", 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.

skills CLI

$ npx skills add digego/extempore --skill extempore-debugging -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install digego/extempore extempore-debugging --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/digego/extempore.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/extempore-debugging .opencode/skills/extempore-debugging && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "extempore-debugging" agent skill from https://github.com/digego/extempore/tree/master/.claude/skills/extempore-debugging into .opencode/skills/extempore-debugging/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "extempore-debugging", 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: extempore-debugging
GitHub stars: 1.5k
Token cost: ~4.4k tokens
SKILL.md length: 1,659 words
Files: 1
Skills in repo: 1
Repo updated: Sep 24, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

Debugging guide for Extempore covering its three layers, compilation paths, startup sequence and the batch, eval and interactive modes used to isolate JIT problems.

Works in 3 steps: C++ runtime (src/): Scheme interpreter,… → Scheme runtime (runtime/): scheme.xtm,… → xtlang libraries (libs/): user-facing…
Debugging JIT compilation failures in Extempore
SKILL.md covers Architecture overview, Compilation paths, Startup sequence and Key flags, plus 11 more sections
Calls cmake, ffprobe and ffmpeg

What it does

Extempore has a C++ runtime holding the Scheme interpreter, LLVM JIT and audio and OSC support, a Scheme runtime, and xtlang libraries on top. The skill explains the interactive compilation path from llvm:compile-ir into the JIT, the AOT path that queues IR when an output port is set, and the startup sequence from main through the init files to loading the base library and the AOT cache.

Key flags help isolate bugs: skipping the base library, disabling audio for headless CI, running a single-process batch expression, evaluating at startup while keeping the TCP server, and rendering DSP output to a WAV file with an optional duration cap. Batch and eval modes differ in process setup, so type-inference bugs may reproduce in one and not the other, and the guide advises testing in both.

When your agent uses it

Debugging JIT compilation failures in Extempore
Tracking symbols through the interactive and AOT compilation paths
Reproducing a bug in batch mode versus eval mode
Running Extempore headless in CI, optionally rendering audio to a WAV file

Example prompts

“My xtlang function fails to compile under eval but works in batch mode, so help me work out why.”
“Run Extempore with the nobase and noaudio flags to test JIT compilation in isolation.”
“Render the DSP output to a WAV file in a headless run and stop it after ten seconds.”

Requirements

A built Extempore with its source tree

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

C++ runtime (src/): Scheme interpreter, LLVM JIT, audio/OSC
Scheme runtime (runtime/): scheme.xtm, llvmir.xtm, llvmti.xtm
xtlang libraries (libs/): user-facing compiled DSL code

What it can do on your machine

Read from SKILL.md and the folder at commit 5e42e31. 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
Shell commands in SKILL.md call:
- cmake
- ffprobe
- ffmpeg
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

Extempore JIT Debugging Guide loads about 4.4k tokens when it runs. Until then it costs about 53 tokens; SKILL.md has 1,659 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~53
When it runs · the whole SKILL.md, loaded when a task matches: ~4.4k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 1,659 words (~4,445 tokens).

name: extempore-debugging

Outline of SKILL.md

Extempore debugging skill
Architecture overview
Compilation paths
Normal (interactive) compilation
AOT compilation
Startup sequence
Key flags
--batch vs --eval differences
Symbol tracking
sTypeDefinitions accumulator
Adhoc polymorphism names
Common issues
Type definitions
Windows CRLF
Symbol not found after compilation
--batch mode hangs after errors
Bug doesn't reproduce in --batch mode
Scheme ↔ xtlang interop gotchas
Calling xtlang functions from Scheme
--batch evaluates a single expression
(quit rc) and stdio flushing
xtlang set! returns the assigned value
Mis-reading shell exit codes behind |
Debugging commands
Sending expressions via TCP
Monkey-patching Scheme compiler functions
Testing in isolation
C++ debug output
Building and testing
Examples as tests

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/extempore-debugging of digego/extempore.

Open the folder on GitHubat commit 5e42e31

Compare with similar skills

Extempore JIT Debugging Guide 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.

Extempore JIT Debugging Guide compared with similar skills
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OpenLogi macOS Permissions TriageAprilNEA/OpenLogi	23k	—	~2.5k	Automated safety check: Notes	Apache-2.0	3 days ago
Bug Finder for daisyUIsaadeghi/daisyui	43k	—	~2.3k	Automated safety check: Pass	MIT	7 days ago
Root Cause Debugginggarrytan/gstack	136k	—	~1.4k	Automated safety check: Pass	MIT	today

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Works with

Questions about Extempore JIT Debugging Guide

What does Extempore JIT Debugging Guide do?

Debugging guide for Extempore covering its three layers, compilation paths, startup sequence and the batch, eval and interactive modes used to isolate JIT problems. Extempore has a C++ runtime holding the Scheme interpreter, LLVM JIT and audio and OSC support, a Scheme runtime, and xtlang libraries on top. The skill explains the interactive compilation path from llvm:compile-ir into the JIT, the AOT path that queues IR when an output port is set, and the startup sequence from main through the init files to loading the base library and the AOT cache.

When should I use Extempore JIT Debugging Guide?

Extempore JIT Debugging Guide fits situations like: debugging JIT compilation failures in Extempore; tracking symbols through the interactive and AOT compilation paths; reproducing a bug in batch mode versus eval mode; running Extempore headless in CI, optionally rendering audio to a WAV file.

How do I install Extempore JIT Debugging Guide in Claude Code?

Run `npx skills add digego/extempore --skill extempore-debugging -a claude-code`. Or copy the skill folder (.claude/skills/extempore-debugging in digego/extempore) into .claude/skills/extempore-debugging in your project. Claude Code loads it when a task matches its description.

How do I install Extempore JIT Debugging Guide in Codex?

Run `npx skills add digego/extempore --skill extempore-debugging -a codex`. Or copy the skill folder (.claude/skills/extempore-debugging in digego/extempore) into .agents/skills/extempore-debugging in your project. Codex loads it when a task matches its description.

Can I use Extempore JIT Debugging Guide 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 digego/extempore --skill extempore-debugging -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/extempore-debugging, .gemini/skills/extempore-debugging, .github/skills/extempore-debugging and .opencode/skills/extempore-debugging in your project.

What does Extempore JIT Debugging Guide need to run?

Going by SKILL.md and its folder, Extempore JIT Debugging Guide needs the command-line tools its instructions call (cmake, ffprobe and ffmpeg). Our summary lists: A built Extempore with its source tree.

Does Extempore JIT Debugging Guide 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 Extempore JIT Debugging Guide 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 Extempore JIT Debugging Guide use?

No licence was found for Extempore JIT Debugging Guide or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Extempore JIT Debugging Guide use?

About 4.4k tokens (SKILL.md is roughly 18k 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 Extempore JIT Debugging Guide?

Skills that share tags, products or a category with Extempore JIT Debugging Guide: OpenROAD Bug Fixer (The-OpenROAD-Project/OpenROAD, 3.2k stars), Debugging Code (JetBrains/skills, 363 stars), OpenLogi macOS Permissions Triage (AprilNEA/OpenLogi, 23k stars) and Bug Finder for daisyUI (saadeghi/daisyui, 43k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Extempore JIT Debugging Guide?

digego (a GitHub user) maintains it in digego/extempore, which has 1,464 GitHub stars. The repository was last updated on September 24, 2026.

Source: digego/extempore on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Extempore JIT Debugging Guide

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

OpenROAD Bug Fixer

Debugging Code

OpenLogi macOS Permissions Triage

Bug Finder for daisyUI

Root Cause Debugging

Graph-Based Bug Tracing

Related

Questions about Extempore JIT Debugging Guide