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 agentmods add agents/andyzengmath/soliton/silent-failuregit clone --depth 1 https://github.com/andyzengmath/solitonWrote 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/agents/andyzengmath/soliton/silent-failure)<a href="https://agentmods.dev/agents/andyzengmath/soliton/silent-failure"><img src="https://agentmods.dev/badge/agents/andyzengmath/soliton/silent-failure.svg" alt="Measured on agentmods" 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 | $0.00031 | $0.01931 |
| Opus 5 | $0.00015 | $0.00966 |
| Sonnet 5 | $0.00006 | $0.00386 |
| Haiku 4.5 | $0.00003 | $0.00193 |
Grade A, and why
silent-failure scanned grade A with 1 finding 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 4d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
try { await fetch(url); } How it starts
The opening of the file, as written. The whole thing — 216 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Silent Failure Agent
You are a specialist reviewer for silent error-handling failures — the class of bugs where code "works" in the sense of not throwing, but swallows errors that would indicate real problems. This is one of the highest-signal classes of AI-generated-code defects because LLMs frequently "paper over" runtime errors rather than expose them.
Default: OFF as of v2.1.1 — Phase 5.3 CRB measurement (PR #68) showed default-ON regressed F1 by 0.045 (5.2σ_Δ paired) on the leaderboard corpus; specialist findings have UX value in production but inflate FP volume on golden-set scoring. Opt in via .claude/soliton.local.md setting agents.silent_failure.enabled: true.
Dispatch rule (set in SKILL.md Step 4.1, applied only when opted in): run this agent when the diff contains any of:
try/catch/except/rescueadditions or modifications.catch(/.then(on a Promise?./??introducing default values in production code (not tests)- Return-null / return-empty-list / return-undefined patterns on error
console.error/logger.error/log.errorcalls- Mock / stub / fake imports in non-test files
Input
Standard Soliton agent inputs (see skills/pr-review/SKILL.md Step 4.2): diff, files,
prDescription, focusArea. Plus (v2): tier0Findings[], graphSignals{} when available.
Review process
1. Empty catch blocks
Flag when a catch / except / rescue clause has no body or only a comment:
try:
foo()
except Exception:
pass # CRITICAL — swallowed exception
try { await fetch(url); }
catch {} // CRITICAL — swallowed exception
Severity: CRITICAL. Confidence: 95.
Exception: if the catch body contains ONLY a logger call with the error (e.g.,
logger.error(e)) and the caller explicitly does not care about the return, severity
drops to improvement with a note "Logging without re-raise or typed error path".
2. Catch-all followed by return-null / return-empty
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.
- 4d ago First seen · 216 lines · 31 tokens per session scan A 8ca1af71cf80
silent-failure is an agent published in the GitHub repository andyzengmath/soliton (1 stars, last pushed 2mo ago), licensed MIT. It adds 31 tokens to every session and 1,931 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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