Use this when configuring, validating, or debugging LiteLLM Router model groups, fallbacks, retries, cooldowns, budgets, routing strategies, health-check routing, aliases, tag filtering…

Custom licenceAuto-check passedAI & LLM Engineering

Install Routing

skills CLI
$ npx skills add VectorSpaceLab/AREX-Skill --skill routing -a claude-code

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

GitHub CLI
$ gh skill install VectorSpaceLab/AREX-Skill routing --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/VectorSpaceLab/AREX-Skill.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/repositories/repo-skills/litellm/sub-skills/routing .claude/skills/routing && 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/

Facts

Skill name
routing
GitHub stars
328
Token cost
~879 tokens
SKILL.md length
337 words
Files
5 (incl. scripts, references)
Skills in repo
157
Repo updated
First seen
Licence
Custom licence

At a glance

Use this when configuring, validating, or debugging LiteLLM Router model groups, fallbacks, retries, cooldowns, budgets, routing strategies, health-check routing, aliases, tag filtering…

  • Works in 5 steps: Identify whether the user is using… → Confirm the logical model group names in… → Validate config shape before runtime… → …
  • Tasks that involve Model routing and gateways
  • SKILL.md covers Start Here, Common Tasks, Reference Map and Safety
  • Runs Python scripts from its folder; calls python

What it does

Routing is an agent skill from VectorSpaceLab/AREX-Skill. Use this when configuring, validating, or debugging LiteLLM Router model groups, fallbacks, retries, cooldowns, budgets, routing strategies, health-check routing, aliases, tag filtering, adaptive/quality/complexity routing, or proxy YAML routing behavior.

Its SKILL.md is about 880 tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including scripts and reference files (for example `references/proxy-routing-config.md`, `references/router-api.md` and `references/troubleshooting.md`).

It sits in AI & LLM Engineering, covering Model routing and gateways. The repository describes itself as: A Skill Library for Automated Machine Learning.

When your agent uses it

  • Tasks that involve Model routing and gateways

Example prompts

  • “/routing”

Requirements

  • Python 3

Workflow steps

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

  1. Identify whether the user is using direct Python or proxy YAML.
  2. Confirm the logical model group names in model_list[*].model_name; fallbacks, aliases, routing groups, tag filtering, and adaptive router…
  3. Validate config shape before runtime debugging
  4. For Python usage, build litellm.Router(model_list=[...]) and call router.completion(...), await router.acompletion(...)…
  5. For proxy usage, put routing keys in the YAML config and start the proxy normally; clients call the logical model_name.

What it can do on your machine

Read from SKILL.md and the folder at commit ac3fe1a. 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 1 file in scripts/ (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • python

    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

Routing loads about 879 tokens when it runs, and up to ~5.4k if it reads all its reference files. Until then it costs about 66 tokens; SKILL.md has 337 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~66
When it runs · the whole SKILL.md, loaded when a task matches
~879
With references · SKILL.md plus every file in references/, read only if the agent opens them
~5.4k

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); the scripts in this folder are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 337 words (~879 tokens).

“Use this sub-skill for LiteLLM's Router class and proxy routing configuration. Route raw one-off SDK calls to sdk-core, proxy deployment and admin operations to proxy-server, and provider-specific endpoint/auth details to providers-and-endpoints.”

— opening of SKILL.md by VectorSpaceLab, Custom licence
name
routing
disable-model-invocation
true
metadata.disco-role
operating
license
NOASSERTION

Read the full SKILL.md on GitHub

Files

SKILL.md and 4 other files (scripts, references) in skills/repositories/repo-skills/litellm/sub-skills/routing of VectorSpaceLab/AREX-Skill.

  • SKILL.md
  • references/proxy-routing-config.md
  • references/router-api.md
  • references/troubleshooting.md
  • scripts/inspect_router_config.py

Open the folder on GitHubat commit ac3fe1a

Compare with similar skills

Routing 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.

Routing compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Routing this skillVectorSpaceLab/AREX-Skill328—~879Automated safety check: PassCustom licence
Antigravityyuting0624/antigravity-for-claude-code376—~9.1kAutomated safety check: PassMIT
Provider Integrationhex/claude-council848—~635Automated safety check: PassMIT
Config Architecturemajiayu000/litellm-rs117—~3.2kAutomated safety check: PassMIT
OmniRoute CLI Evalsdiegosouzapw/OmniRoute74k—~1.3kAutomated safety check: PassMIT
Gatewaytheopenco/llmgateway1.7k—~736Automated safety check: PassCustom licence

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Questions about Routing

What does Routing do?

Use this when configuring, validating, or debugging LiteLLM Router model groups, fallbacks, retries, cooldowns, budgets, routing strategies, health-check routing, aliases, tag filtering…. Routing is an agent skill from VectorSpaceLab/AREX-Skill. Use this when configuring, validating, or debugging LiteLLM Router model groups, fallbacks, retries, cooldowns, budgets, routing strategies, health-check routing, aliases, tag filtering, adaptive/quality/complexity routing, or proxy YAML routing behavior.

When should I use Routing?

Routing fits situations like: tasks that involve Model routing and gateways.

How do I install Routing in Claude Code?

Run `npx skills add VectorSpaceLab/AREX-Skill --skill routing -a claude-code`. Or copy the skill folder (skills/repositories/repo-skills/litellm/sub-skills/routing in VectorSpaceLab/AREX-Skill) into .claude/skills/routing in your project. Claude Code loads it when a task matches its description.

How do I install Routing in Codex?

Run `npx skills add VectorSpaceLab/AREX-Skill --skill routing -a codex`. Or copy the skill folder (skills/repositories/repo-skills/litellm/sub-skills/routing in VectorSpaceLab/AREX-Skill) into .agents/skills/routing in your project. Codex loads it when a task matches its description.

Can I use Routing 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 VectorSpaceLab/AREX-Skill --skill routing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/routing, .gemini/skills/routing, .github/skills/routing and .opencode/skills/routing in your project.

What does Routing need to run?

Going by SKILL.md and its folder, Routing needs Python for the scripts in its folder and the command-line tools its instructions call (python). Our summary lists: Python 3.

Does Routing 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 Routing 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 Routing use?

Routing has a licence file (declared in SKILL.md) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Routing use?

About 879 tokens (SKILL.md is roughly 3.5k 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 4.6k tokens, read only when the agent opens those files.

What are the alternatives to Routing?

Skills that share tags, products or a category with Routing: Antigravity (yuting0624/antigravity-for-claude-code, 376 stars), Provider Integration (hex/claude-council, 848 stars), Config Architecture (majiayu000/litellm-rs, 117 stars) and OmniRoute CLI Evals (diegosouzapw/OmniRoute, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Routing?

VectorSpaceLab (a GitHub organization) maintains it in VectorSpaceLab/AREX-Skill, which has 328 GitHub stars. The repository holds 157 skills in this directory. The repository was last updated on September 3, 2026.

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