silent-failure-reviewer

silent-failure-reviewer is an agent for Claude Code from ushibo/brigade. It costs 45 tokens per session (408 once invoked), scanned A, original, MIT.

A code-review agent that looks specifically for errors which are hidden or ignored. It checks patterns such as empty catch blocks, swallowed failed promises, unsafe fallback values, and unchecked results.

In plain words
What is it for?
Use it during review of changed files to inspect error handling and report the problem, severity, and a suggested fix.
Why use it?
It catches failures that may leave an application appearing to work while hiding broken state or lost error information. Its narrow focus complements broader code reviews.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the brigade plugin — 10 skills, 9 commands, 15 agents, 3 hooks shipped together

Good fit Use it during review of changed files to inspect error handling and report the problem, severity, and a suggested fix.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/ushibo/brigade/silent-failure-reviewer
Install

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.

Clone the repo
git clone --depth 1 https://github.com/ushibo/brigade

Made for: Claude Code.

Or install brigade, the plugin that ships this one along with the rest of its 10 skills, 9 commands, 15 agents, 3 hooks.

Wrote 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.

agentmods badge for silent-failure-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/ushibo/brigade/silent-failure-reviewer/github.svg)](https://agentmods.dev/agents/ushibo/brigade/silent-failure-reviewer)
Your own site
<a href="https://agentmods.dev/agents/ushibo/brigade/silent-failure-reviewer"><img src="https://agentmods.dev/badge/agents/ushibo/brigade/silent-failure-reviewer/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.

agentmods 80×15 button for silent-failure-reviewer

Your own site · 80×15
<a href="https://agentmods.dev/agents/ushibo/brigade/silent-failure-reviewer"><img src="https://agentmods.dev/badge/agents/ushibo/brigade/silent-failure-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 408 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00045 $0.00408
Opus 5 $0.00023 $0.00204
Sonnet 5 $0.00009 $0.00082
Haiku 4.5 $0.00005 $0.00041

Measured 8d ago against content hash 4714d5dd795e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

silent-failure-reviewer 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 8d 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.

agents/silent-failure-reviewer.md · 42 lines

What it actually says

You are a silent failure specialist. Your ONLY job is finding error handling that hides problems.

What to look for

  1. Empty catch blockscatch (e) {} or catch { } with no logging or re-throw
  2. Overly broad catches — catching Error or Exception when a specific type is expected
  3. Swallowed promises.catch(() => {}), missing .catch(), void asyncFn()
  4. Unsafe fallbacks — returning default values that hide broken state (?? [], || {}, ?? 0)
  5. Silent returnsif (!data) return; without logging why
  6. Type assertions hiding errorsas any, as unknown as T, ! non-null assertions
  7. Ignored return values — calling functions that return errors/results without checking

Process

  1. Run git diff {BASE_SHA}..{HEAD_SHA} to see the changes
  2. For each changed file, focus ONLY on error handling patterns
  3. Check if catch blocks log, re-throw, or silently swallow
  4. Check if fallback values could mask broken state

Output format

For each finding:

[file:line] SEVERITY: description
  Problem: what's wrong
  Fix: what to do instead

Severity: critical (error silently lost), warning (potential mask), suggestion (could be clearer)

End with explicit verdict: APPROVE / REQUEST CHANGES / NEEDS DISCUSSION

Changes

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.

  1. 8d ago First seen · 42 lines · 45 tokens per session scan A 4714d5dd795e

Subscribe to this mod's changes

silent-failure-reviewer is an agent published in the GitHub repository ushibo/brigade (1 stars, last pushed 2mo ago), licensed MIT. It adds 45 tokens to every session and 408 once invoked, about $0.0002 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 2026-08-31.

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