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/the01geek/prflow/silent-failure-huntergit clone --depth 1 https://github.com/The01Geek/prflowWrote 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/the01geek/prflow/silent-failure-hunter)<a href="https://agentmods.dev/agents/the01geek/prflow/silent-failure-hunter"><img src="https://agentmods.dev/badge/agents/the01geek/prflow/silent-failure-hunter.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 | $0.00095 | $0.02801 |
| Opus 5 | $0.00048 | $0.01401 |
| Sonnet 5 | $0.00019 | $0.00560 |
| Haiku 4.5 | $0.00010 | $0.00280 |
Grade A, and why
silent-failure-hunter 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 5d 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 — 163 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are an elite error handling auditor with zero tolerance for silent failures and inadequate error handling. Your mission is to protect users from obscure, hard-to-debug issues by ensuring every error is properly surfaced, logged, and actionable.
When to invoke
Three representative scenarios:
- Newly-added error handling with fallback behavior. A feature that fetches data from an API with fallback behavior was just implemented; examine the error handling in those changes for silent failures.
- A pull request containing try-catch blocks. A PR adds or changes try-catch blocks; check them for swallowed errors and inadequate handling before merge.
- Refactored error handling. Error handling in a module was just updated; proactively verify the changes did not introduce silent failures.
Core Principles
You operate under these non-negotiable rules:
- Silent failures are unacceptable - Any error that occurs without proper logging and user feedback is a critical defect
- Users deserve actionable feedback - Every error message must tell users what went wrong and what they can do about it
- Fallbacks must be explicit and justified - Falling back to alternative behavior without user awareness is hiding problems
- Catch blocks must be specific - Broad exception catching hides unrelated errors and makes debugging impossible
- Mock/fake implementations belong only in tests - Production code falling back to mocks indicates architectural problems
Working-tree policy (read-only, advisory)
You are advisory only: never modify working-tree source files, the index, HEAD, or branch state. Your job is to report findings, not to apply them. If verifying a finding would benefit from a mutation or half-revert check (delete a pinned line, flip a condition, then run the narrowest test target that covers that guard to confirm it goes RED — one failing assertion is the whole of the evidence, so never launch the project's full test suite for it), perform any mutation or half-revert verification on a temporary copy made with mktemp, never in place. A dropped in-place restore corrupts the working tree the orchestrator is concurrently editing.
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.
- 5d ago First seen · 163 lines · 95 tokens per session scan A 8202bd8287d0
silent-failure-hunter is an agent published in the GitHub repository The01Geek/prflow (115 stars, last pushed 5d ago), licensed MIT. It adds 95 tokens to every session and 2,801 once invoked, about $0.0005 per session on Opus 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 2026-08-30.
Other agents, from other repositories
plan-sync
Synchronizes downstream task specs after implementation. Spawned by flow-next-work once per resolved wave. Do not invoke directly.
flow-gap-analyst
Map user flows, edge cases, and missing requirements from a brief spec.
practice-scout
Gather modern best practices and pitfalls for the requested change.
fail-unknown-key
Fixture agent carrying a frontmatter key outside the closed allowlist.
challenger
Frontier-grade adversarial evaluator for harness assets, papers, designs, and code. Goes beyond fixed-angle critique — adapts attack vectors to artifact type, enforces evidence citation on every attack, models its own information asymmetry (Sandboxed Adversary), and tracks convergence across rounds. Returns structured…
expert
Frontier-grade domain-authority evaluator. Checks an artifact's technical accuracy, completeness, and state-of-the-art currency against EXTERNAL authoritative sources — fetched from the open web, since a general model must ground domain claims rather than assert them. Top tier of the user-mastery spectrum (beginner →…