Crush Configuration
charmbracelet/crush
Explains how to configure the Crush coding agent with crushrc or crush.json, covering providers, models, LSPs, MCP servers, hooks, permissions and config precedence.
Answer structural questions about a codebase — what a symbol is, what calls it, what a change breaks, where the hotspots are — from a persistent code graph via the ix CLI, instead of grepping.
Install Ix
$ npx skills add ix-infrastructure/Ix --skill ix -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ix-infrastructure/Ix ix --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/ix-infrastructure/Ix.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/ix .claude/skills/ix && 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 "ix" agent skill from https://github.com/ix-infrastructure/Ix/tree/main/skills/ix into .claude/skills/ix/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ix", 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/ix-infrastructure/Ix/tree/main/skills/ixType 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 ix-infrastructure/Ix --skill ix -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ix-infrastructure/Ix ix --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ix-infrastructure/Ix.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/ix .agents/skills/ix && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "ix" agent skill from https://github.com/ix-infrastructure/Ix/tree/main/skills/ix into .agents/skills/ix/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ix", 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 ix-infrastructure/Ix --skill ix -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ix-infrastructure/Ix ix --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ix-infrastructure/Ix.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/ix .cursor/skills/ix && 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 "ix" agent skill from https://github.com/ix-infrastructure/Ix/tree/main/skills/ix into .cursor/skills/ix/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ix", 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/ix-infrastructure/Ix.git --path skills/ix--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 ix-infrastructure/Ix --skill ix -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ix-infrastructure/Ix ix --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ix-infrastructure/Ix.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/ix .gemini/skills/ix && 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 "ix" agent skill from https://github.com/ix-infrastructure/Ix/tree/main/skills/ix into .gemini/skills/ix/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ix", 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 ix-infrastructure/Ix ixInstalls 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 ix-infrastructure/Ix --skill ix -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ix-infrastructure/Ix.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/ix .github/skills/ix && 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 "ix" agent skill from https://github.com/ix-infrastructure/Ix/tree/main/skills/ix into .github/skills/ix/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ix", 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 ix-infrastructure/Ix --skill ix -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ix-infrastructure/Ix ix --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ix-infrastructure/Ix.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/ix .opencode/skills/ix && 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 "ix" agent skill from https://github.com/ix-infrastructure/Ix/tree/main/skills/ix into .opencode/skills/ix/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ix", 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
ix- GitHub stars
- 1k
- Token cost
- ~1.2k tokens
- SKILL.md length
- 673 words
- Files
- 7 (incl. scripts, references)
- Skills in repo
- 1
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Answer structural questions about a codebase — what a symbol is, what calls it, what a change breaks, where the hotspots are — from a persistent code graph via the ix CLI, instead of grepping.
- Works in 5 steps: Start with ix context — one bounded call… → Read the ranges, not the files. ix read… → Ask the graph what grep cannot: ix… → …
- Agent Workflows work in your project
- SKILL.md covers First run, Core workflow, Over MCP and How to spend calls, plus 2 more sections
- Runs PowerShell and Shell scripts from its folder; calls bash
What it does
Ix is an agent skill from ix-infrastructure/Ix. Answer structural questions about a codebase — what a symbol is, what calls it, what a change breaks, where the hotspots are — from a persistent code graph via the ix CLI, instead of grepping.
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 8 other files, including scripts and reference files (for example `references/commands.md`, `references/flags.md` and `references/output-formats.md`).
It sits in Agent Workflows. It works with Model Context Protocol. The repository describes itself as: Understand any codebase instantly. System intelligence for codebases, built for humans and AI. The licence is Apache-2.0.
When your agent uses it
- Agent Workflows work in your project
Example prompts
- “/ix”
Requirements
- A Bash shell
- PowerShell
- Docker
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Start with ix context — one bounded call that names the
- Read the ranges, not the files. ix read , or path:120-180, is
- Ask the graph what grep cannot: ix callers, ix imported-by and
- Do not poll ix status. A command that needs the backend says so itself,
- Format: llm is the one to read, and IX_FORMAT=llm (or
What it can do on your machine
Read from SKILL.md and the folder at commit 74499ba. 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
Ships 2 files in scripts/ (PowerShell and Shell), which the agent can run.
Shell commands in SKILL.md call:
bash
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
Ix loads about 1.2k tokens when it runs, and up to ~18k if it reads all its reference files. Until then it costs about 49 tokens; SKILL.md has 673 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); the scripts in this folder are not scanned.
SKILL.md
The full file from ix-infrastructure/Ix at commit 74499ba, republished under its Apache-2.0 licence (© ix-infrastructure). 673 words, ~1,249 tokens.
Download SKILL.mdSave it as
.claude/skills/ix/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.- name
- ix
- description
- Answer structural questions about a codebase — what a symbol is, what calls it, what a change breaks, where the hotspots are — from a persistent code graph via the ix CLI, instead of grepping.
- license
- Apache-2.0
- metadata.version
- 1.0.0
- metadata.source
- https://github.com/ix-infrastructure/Ix
Ix — Persistent Codebase Map
Ix parses a repository with tree-sitter (27 languages) into a graph of symbols, calls and imports, kept in a local backend (ArangoDB via Docker) and persisted between sessions. Query it for structural answers — what a symbol is, what calls it, how a flow moves, what a change breaks, which files carry the most weight, where the smells are — instead of reading files to find out. It does not answer prose or history questions.
First run
bash scripts/bootstrap.sh [repo-root] [--no-map] # macOS / Linux / Git Bash
powershell -ExecutionPolicy Bypass -File scripts/bootstrap.ps1 [repo-root] [-NoMap] # WindowsChecks Node >= 22, git, Docker and ripgrep, installs the CLI if missing, starts the backend, and maps the repo. Re-run it per repo.
Core workflow
| Step | Command | Example |
|---|---|---|
| Bounded context to start from | ix context | ix context IngestionService |
| Start from an issue or bug report | ix context --from-issue | ix context --from-issue issue.md (or - for stdin) |
| Understand a component | ix explain | ix explain IngestionService |
| Trace a flow | ix trace | ix trace user_login_flow |
| Blast radius of a change | ix impact | ix impact verify_token |
Over MCP
When the ix-memory MCP server is connected (ix mcp; register it with
ix mcp install), the same graph is five tools. Reach for them where Grep,
Glob and Read need several steps or cannot answer at all:
| Question | Tool |
|---|---|
| Where to start on an issue or task; what a file or symbol touches | ix_context target=<name or path> or ix_context issue=<issue text> |
| Who calls / is called by / imports / is imported by X, across files | ix_neighbors symbol=X relation=callers|callees|imports|imported_by |
| What a change to X reaches, before editing it | ix_impact target=X |
| Which definition a name means when several share it | ix_search term=X |
| A definition's source by name, without knowing its file | ix_read symbol=X |
Not for a literal string or a line in a file you already have open: that is
Grep and Read. ix_context and ix_impact end in next records phrased as
tool calls; an ambiguous name answers with candidates and pick=/path= to
choose one. No health check is needed first. ix mcp --tools=all serves
every command as a tool.
Show full SKILL.md (345 more words)Show less
How to spend calls
- Start with
ix context <file-or-symbol>— one bounded call that names the files and symbols that matter, with line ranges. - Read the ranges, not the files.
ix read <symbol>, orpath:120-180, is one to three thousand tokens; the file around it is commonly thirty to sixty thousand — and every one of those is re-sent on every later step of the turn. - Ask the graph what grep cannot:
ix callers,ix imported-byandix impactanswer "who uses this" and "what does a change reach" across files. Drill further withix search,ix callees,ix contains,ix imports,ix depends, reusing the exact entity IDs from earlier output. - Do not poll
ix status. A command that needs the backend says so itself, with a hint; a health check in front of every call is a wasted round trip. - Format:
llmis the one to read, andIX_FORMAT=llm(orix config set format llm) makes it the default so it need not be typed per call;jsonis for chaining or extracting a field. Onix contextthe same answer runs about 7.6 : 0.8 : 1 for json : llm : text.
Rules
- Answer codebase questions from targeted
ixcommands, not from training data. - Never guess a codebase fact that Ix holds.
- The graph is kept current for you: bootstrap maps the repo and editor
plugins re-ingest edited files. Run
ix map --silentonly when results are visibly stale, such as after a branch switch or a pull. - When Ix reports low confidence, say so, and never present it as established fact.
References — load on demand
- references/commands.md — command routing tables, decomposition recipes, best practices, the do-not-use list. Before any command beyond the table above.
- references/flags.md — every flag the CLI registers, per command, with values and defaults. Before guessing whether a flag exists.
- references/output-formats.md — the
llm|json|textrules, what does not implementllm, and which commands are Pro-gated. - references/troubleshooting.md — prerequisites,
ix doctor, backend health, environment flags. When a command fails. - scripts/bootstrap.sh / scripts/bootstrap.ps1 — first-run setup (bash; and native PowerShell for Windows).
© ix-infrastructure, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 6 other files (scripts, references) in skills/ix of ix-infrastructure/Ix.
- SKILL.md
- references/commands.md
- references/flags.md
- references/output-formats.md
- references/troubleshooting.md
- scripts/bootstrap.ps1
- scripts/bootstrap.sh
Open the folder on GitHubat commit 74499ba
Compare with similar skills
Ix 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 |
|---|---|---|---|---|---|---|
| Ix this skillix-infrastructure/Ix | 1k | — | ~1.2k | Automated safety check: Pass | Apache-2.0 | |
| Crush Configurationcharmbracelet/crush | 29k | — | ~3.7k | Automated safety check: Pass | Custom licence | |
| Orca Run Replayiflytek/skillhub | 5.2k | 4 repos | ~3k | Automated safety check: Pass | Apache-2.0 | |
| PicoClaw Agentsipeed/picoclaw | 30k | — | ~7.2k | Automated safety check: Notes | MIT | |
| Chatgpt AppsHaohao-end/openagent | 807 | 1 repos | ~4.9k | Automated safety check: Pass | Apache-2.0 | |
| Chatgpt App Builderalpic-ai/skybridge | 2.1k | — | ~1k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Ix
What does Ix do?
Answer structural questions about a codebase — what a symbol is, what calls it, what a change breaks, where the hotspots are — from a persistent code graph via the ix CLI, instead of grepping. Ix is an agent skill from ix-infrastructure/Ix. Answer structural questions about a codebase — what a symbol is, what calls it, what a change breaks, where the hotspots are — from a persistent code graph via the ix CLI, instead of grepping.
When should I use Ix?
Ix fits situations like: agent Workflows work in your project.
How do I install Ix in Claude Code?
Run `npx skills add ix-infrastructure/Ix --skill ix -a claude-code`. Or copy the skill folder (skills/ix in ix-infrastructure/Ix) into .claude/skills/ix in your project. Claude Code loads it when a task matches its description.
How do I install Ix in Codex?
Run `npx skills add ix-infrastructure/Ix --skill ix -a codex`. Or copy the skill folder (skills/ix in ix-infrastructure/Ix) into .agents/skills/ix in your project. Codex loads it when a task matches its description.
Can I use Ix 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 ix-infrastructure/Ix --skill ix -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ix, .gemini/skills/ix, .github/skills/ix and .opencode/skills/ix in your project.
What does Ix need to run?
Going by SKILL.md and its folder, Ix needs PowerShell and a shell for the scripts in its folder and the command-line tools its instructions call (bash). Our summary lists: A Bash shell; PowerShell; Docker.
Does Ix 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 Ix 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Ix use?
Ix is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Ix use?
About 1.2k tokens (SKILL.md is roughly 5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 17k tokens, read only when the agent opens those files.
What are the alternatives to Ix?
Skills that share tags, products or a category with Ix: Crush Configuration (charmbracelet/crush, 29k stars), Orca Run Replay (iflytek/skillhub, 5.2k stars), PicoClaw Agent (sipeed/picoclaw, 30k stars) and Chatgpt Apps (Haohao-end/openagent, 807 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Ix?
ix-infrastructure (a GitHub organization) maintains it in ix-infrastructure/Ix, which has 1,030 GitHub stars. The repository was last updated on October 7, 2026.
Source: ix-infrastructure/Ix on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.