Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add latestaiagents/agent-skills --skill stack-trace-decodergit clone --depth 1 https://github.com/latestaiagents/agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/latestaiagents/agent-skills/stack-trace-decoder)<a href="https://agentmods.dev/skills/latestaiagents/agent-skills/stack-trace-decoder"><img src="https://agentmods.dev/badge/skills/latestaiagents/agent-skills/stack-trace-decoder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/latestaiagents/agent-skills/stack-trace-decoder"><img src="https://agentmods.dev/badge/skills/latestaiagents/agent-skills/stack-trace-decoder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00053 | $0.02309 |
| Opus 5.5 | $0.00021 | $0.00924 |
| Sonnet 5.5 | $0.00011 | $0.00462 |
| Haiku 4.5 | $0.00005 | $0.00231 |
Grade A, and why
stack-trace-decoder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 344 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Stack Trace Decoder
Parse, understand, and extract actionable insights from stack traces.
When to Use
- Understanding where an error originated
- Decoding minified/obfuscated traces
- Identifying the call chain leading to failure
- Comparing stack traces across incidents
- Explaining traces to team members
Stack Trace Anatomy
JavaScript/Node.js
Error: Cannot read properties of undefined (reading 'map')
at processItems (/app/src/services/processor.js:45:12)
at async handleRequest (/app/src/handlers/api.js:23:5)
at async Router.handle (/app/node_modules/express/router.js:156:3)
at async Layer.handle_request (/app/node_modules/express/layer.js:95:5)
Components:
Error: [Error Type]: [Error Message]
at [Function Name] ([File Path]:[Line]:[Column])
│ │ │ │ │
│ │ │ │ └─ Column number
│ │ │ └─ Line number
│ │ └─ File path
│ └─ Function where error occurred
└─ "at" indicates stack frame
Python
Traceback (most recent call last):
File "/app/main.py", line 45, in process_data
result = transform(data['items'])
File "/app/utils.py", line 23, in transform
return [item.upper() for item in items]
TypeError: 'NoneType' object is not iterable
Note: Python traces read bottom-to-top (error at bottom).
Java
java.lang.NullPointerException: Cannot invoke method on null object
at com.example.service.UserService.getProfile(UserService.java:89)
at com.example.controller.UserController.showProfile(UserController.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:897)
Caused by: java.sql.SQLException: Connection refused
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2181)
... 15 more
Note: Java traces can have "Caused by" chains showing root cause.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 344 lines · 53 tokens per session scan A 25f313404510
stack-trace-decoder is a skill published in the GitHub repository latestaiagents/agent-skills (5 stars, last pushed 6mo ago), licensed MIT. It adds 53 tokens to every session and 2,309 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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