phx-trace SKILL.md skillA
phx-trace from oliver-kriska/claude-elixir-phoenix is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add oliver-kriska/claude-elixir-phoenix/phx-trace@git:20260929.c08ad14Pins git:20260929.c08ad14 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- oliver-kriska/claude-elixir-phoenix
- Path
targets/codex/skills/phx-trace/SKILL.md- Versions recorded
- 4
- Latest version
- git:20260929.c08ad14, committed Sep 29, 2026
- First version recorded
- Jul 21, 2026
- Size
- 2,483 bytes
- Repository stars
- 573
- License
- MIT
Use when debugging how a value or request reaches Elixir code, finding.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Call Tracing Build call trees showing how functions are reached from entry points. ## Iron Laws - Never Violate These 1. **Always use `mix xref callers` first** - It's authoritative; grep is fallback only 2. **Stop at entry points** - Controllers, LiveView callbacks, Oban workers, GenServer callbacks 3. **Track visited MFAs** - Prevent infinite loops from circular calls 4. **Extract argument patterns** - Just knowing "who calls" isn't enough; HOW they call matters 5. **Max depth 10** - Deeper trees indicate architectural issues, not useful traces ## When to Build Call Tree (Use Proactively) | Condition | Why Call Tree Helps | |-----------|---------------------| | Unexpected nil/value at runtime | Trace where the value originates | | Bug can't reproduce locally | See all entry points that reach the code | | Changing function signature | Find all callers and their argument patterns | | Incomplete stack trace | Get full path context | | "Where does X come from?" | Visual answer to data flow question | ## Quick Trace Run the caller query first, then inspect another function in the chain as needed: ```bash mix xref callers MyApp.Accounts.update_user/2 …
Read the whole file at its exact version.
How to install
mdr add oliver-kriska/claude-elixir-phoenix/phx-trace@sha256:5f5a4f3d134cb6d7The line at the top of this page pins the label git:20260929.c08ad14, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ghsq2aj5dgdeugfk)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Jul 21, 2026 and Sep 29, 2026, about one every 23 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260929.c08ad14 latest | 2026-09-29 | c08ad14 | 2,483 B | A | view · diff |
| git:20260724.918f809 | 2026-07-24 | 918f809 | 2,479 B | A | view · diff |
| git:20260723.d82e8e5 | 2026-07-23 | d82e8e5 | 2,451 B | A | view · diff |
| git:20260721.1a43137 | 2026-07-21 | 1a43137 | 2,490 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2483 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
oliver-kriska/claude-elixir-phoenix · 573 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ghsq2aj5dgdeugfk GET https://markdownregistry.com/api/v1/resolve?ref=oliver-kriska/claude-elixir-phoenix/phx-trace GET https://markdownregistry.com/api/v1/blob/5f5a4f3d134cb6d70943da072ab78f6ab90592907b53090ee53491217cec055c
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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