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Debug LLM apps with the Phoenix CLI v1.0.0

Use this resource to debug an LLM application from the terminal with the Phoenix CLI (px)

New

  • 327 downloads
  • 141 likes
  • 183 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install phoenix-observability-cli

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent uses the `px` command to list and read traces, spans and sessions from your Phoenix instance, annotate them and count how often a failure occurs. It can also inspect datasets and experiments.

Mostly picked by

Updated November 2, 2026

Card for the “Debug LLM apps with the Phoenix CLI” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
Apache-2.0

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What you get

  • SKILL.md: px commands for traces, spans, sessions, profiles and configuration
  • references/filter-expressions.md: query filter syntax

Good fit for

  • You want to know why an agent fails on some requests
  • You need to measure how often an error recurs in traces

Not for

    Tags

    • phoenix
    • traces
    • debugging
    • llm

    About

    You say

    “List the failing traces from the last hour and tell me which error comes up most.”

    Card for the “Debug LLM apps with the Phoenix CLI” skill

    Skill published by arize-ai under the Apache-2.0 license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to debug an LLM application from the terminal with the Phoenix CLI (px)
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE3.7 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • references/filter-expressions.md15.2 KB
    • SKILL.md27.4 KB

    Origin and licence

    Listed unmodified

    Author
    arize-ai
    Source
    github.com/arize-ai/phoenix/tree/2196d813a80586c7bd3a3b91a6092d6a3fabb10c/.agents/skills/phoenix-cli
    Licence
    Apache-2.0

    Notice

    « phoenix-cli » (arize-ai, Apache-2.0) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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