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Agent skill

Phoenix REST API

by Arize-ai in Arize-ai/phoenix

REST API development for Phoenix. An agent skill from Arize-ai/phoenix.

Custom licenceAuto-check passedBackend & APIs

Install Phoenix REST API

skills CLI
$ npx skills add Arize-ai/phoenix --skill phoenix-rest-api -a claude-code

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

GitHub CLI
$ gh skill install Arize-ai/phoenix phoenix-rest-api --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/Arize-ai/phoenix.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/phoenix-rest-api .claude/skills/phoenix-rest-api && 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
phoenix-rest-api
GitHub stars
12k
Token cost
~286 tokens
SKILL.md length
85 words
Files
4 (incl. references)
Skills in repo
39
Repo updated
First seen
Licence
Custom licence

At a glance

REST API development for Phoenix. An agent skill from Arize-ai/phoenix.

  • Works in 3 steps: make openapi — regenerate schema +… → Add endpoint to the correct list in… → make lint-python — fix any lint errors…
  • Reviewing endpoints in src/phoenix/server/api/routers/v1/
  • Calls make
  • Tasks that involve LLM observability

What it does

Phoenix REST API is an agent skill from Arize-ai/phoenix. REST API development for Phoenix. Use when adding, modifying, or reviewing endpoints in src/phoenix/server/api/routers/v1/.

Its SKILL.md is about 290 tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `references/endpoint-patterns.md`, `references/openapi-codegen.md` and `references/testing-patterns.md`).

It sits in Backend & APIs, covering LLM observability and REST APIs. The repository describes itself as: AI Observability & Evaluation.

When your agent uses it

  • Reviewing endpoints in src/phoenix/server/api/routers/v1/
  • Tasks that involve LLM observability
  • Tasks that involve REST APIs

Example prompts

  • “/phoenix-rest-api”

Workflow steps

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

  1. make openapi — regenerate schema + client types, commit all generated files
  2. Add endpoint to the correct list in tests/integration/_helpers.py
  3. make lint-python — fix any lint errors before committing

What it can do on your machine

Read from SKILL.md and the folder at commit 856100b. 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:

    • make

    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

Phoenix REST API loads about 286 tokens when it runs, and up to ~1.8k if it reads all its reference files. Until then it costs about 35 tokens; SKILL.md has 85 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~35
When it runs · the whole SKILL.md, loaded when a task matches
~286
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.8k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 85 words (~286 tokens).

“Endpoints: src/phoenix/server/api/routers/v1/. Read the relevant reference.”

— opening of SKILL.md by Arize-ai, Custom licence
name
phoenix-rest-api
user-invocable
false
metadata.internal
true

Read the full SKILL.md on GitHub

Files

SKILL.md and 3 other files (references) in .agents/skills/phoenix-rest-api of Arize-ai/phoenix.

  • SKILL.md
  • references/endpoint-patterns.md
  • references/openapi-codegen.md
  • references/testing-patterns.md

Open the folder on GitHubat commit 856100b

Compare with similar skills

Phoenix REST API 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.

Phoenix REST API compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Phoenix REST API this skillArize-ai/phoenix12k—~286Automated safety check: PassCustom licence
Databuddydatabuddy-analytics/Databuddy1.2k—~2.1kAutomated safety check: PassAGPL-3.0
Backend Dev Guidelineslangfuse/langfuse36k—~1.9kAutomated safety check: PassCustom licence
Phoenix JSON APIj-morgan6/elixir-phoenix-guide166—~2.8kAutomated safety check: PassMIT
OpenAPI to MCP Servermcp-use/mcp-use11k—~5.2kAutomated safety check: PassApache-2.0
Neo4j Aura Agent Skillneo4j-contrib/neo4j-skills114—~3.8kAutomated safety check: NotesMIT

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Categories

Questions about Phoenix REST API

What does Phoenix REST API do?

REST API development for Phoenix. An agent skill from Arize-ai/phoenix. Phoenix REST API is an agent skill from Arize-ai/phoenix. REST API development for Phoenix.

When should I use Phoenix REST API?

Phoenix REST API fits situations like: reviewing endpoints in src/phoenix/server/api/routers/v1/; tasks that involve LLM observability; tasks that involve REST APIs.

How do I install Phoenix REST API in Claude Code?

Run `npx skills add Arize-ai/phoenix --skill phoenix-rest-api -a claude-code`. Or copy the skill folder (.agents/skills/phoenix-rest-api in Arize-ai/phoenix) into .claude/skills/phoenix-rest-api in your project. Claude Code loads it when a task matches its description.

How do I install Phoenix REST API in Codex?

Run `npx skills add Arize-ai/phoenix --skill phoenix-rest-api -a codex`. Or copy the skill folder (.agents/skills/phoenix-rest-api in Arize-ai/phoenix) into .agents/skills/phoenix-rest-api in your project. Codex loads it when a task matches its description.

Can I use Phoenix REST API 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 Arize-ai/phoenix --skill phoenix-rest-api -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/phoenix-rest-api, .gemini/skills/phoenix-rest-api, .github/skills/phoenix-rest-api and .opencode/skills/phoenix-rest-api in your project.

What does Phoenix REST API need to run?

Going by SKILL.md and its folder, Phoenix REST API needs the command-line tools its instructions call (make).

Does Phoenix REST API 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 Phoenix REST API 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 Phoenix REST API use?

Phoenix REST API has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Phoenix REST API use?

About 286 tokens (SKILL.md is roughly 1.1k 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 1.5k tokens, read only when the agent opens those files.

What are the alternatives to Phoenix REST API?

Skills that share tags, products or a category with Phoenix REST API: Databuddy (databuddy-analytics/Databuddy, 1.2k stars), Backend Dev Guidelines (langfuse/langfuse, 36k stars), Phoenix JSON API (j-morgan6/elixir-phoenix-guide, 166 stars) and OpenAPI to MCP Server (mcp-use/mcp-use, 11k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Phoenix REST API?

Arize-ai (a GitHub organization) maintains it in Arize-ai/phoenix, which has 11,744 GitHub stars. The repository holds 39 skills in this directory. The repository was last updated on October 8, 2026.

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