bug-hunter

bug-hunter is an agent for Claude Code from sareegpt/edgartools-mcp. It costs 0 tokens per session (2,551 once invoked), scanned A, a copy of bug-hunter, MIT.

A code-review agent for finding and explaining bugs, edge cases, and unexpected behaviour. It can also compare working and broken financial filings.

In plain words
What is it for?
Use it to review new code, investigate error reports, compare working and broken filings, and document possible reliability problems.
Why use it?
It helps locate likely causes when code behaves incorrectly or misses unusual cases, reducing the need to inspect everything manually.

Agent for Claude Code

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.

agentmods
npx agentmods add agents/sareegpt/edgartools-mcp/bug-hunter
Clone the repo
git clone --depth 1 https://github.com/sareegpt/edgartools-mcp

Made for: Claude Code.

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 bug-hunter

README.md
[![agentmods](https://agentmods.dev/badge/agents/sareegpt/edgartools-mcp/bug-hunter.svg)](https://agentmods.dev/agents/sareegpt/edgartools-mcp/bug-hunter)
Your own site
<a href="https://agentmods.dev/agents/sareegpt/edgartools-mcp/bug-hunter"><img src="https://agentmods.dev/badge/agents/sareegpt/edgartools-mcp/bug-hunter.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,551 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod 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 $0.00000 $0.02551
Opus 5 $0.00000 $0.01275
Sonnet 5 $0.00000 $0.00510
Haiku 4.5 $0.00000 $0.00255

Measured 4d ago against content hash 69cdcdd56bf6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

bug-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 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.

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.

Origin

This is a copy

100% identical to bug-hunter — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/agents/bug-hunter.md · 261 lines

How it starts

The opening of the file, as written. The whole thing — 261 lines — stays where its author put it; the contents beside it link to each section on GitHub.


name: bug-hunter description: Use this agent when you need to systematically identify, analyze, and document potential bugs, edge cases, or reliability issues in code. This includes reviewing recently written code for bugs, analyzing error reports, investigating unexpected behavior, or proactively scanning code for common pitfalls and anti-patterns. \nContext: The user wants to review recently written code for potential bugs.\nuser: "I just implemented a new caching mechanism, can you check for bugs?"\nassistant: "I'll use the bug-hunter agent to systematically analyze your caching implementation for potential issues."\n\nSince the user wants to check for bugs in recently written code, use the bug-hunter agent to perform a thorough analysis.\n\n\n\nContext: The user is experiencing unexpected behavior and needs help identifying the cause.\nuser: "The financial data extraction is sometimes returning None values unexpectedly"\nassistant: "Let me deploy the bug-hunter agent to investigate this issue and identify potential causes."\n\nThe user is reporting unexpected behavior, which is a perfect use case for the bug-hunter agent to investigate.\n\n model: sonnet color: orange

You are an elite bug hunter and code reliability specialist with deep expertise in Python development, particularly in data processing, API integrations, and financial systems. Your mission is to identify, analyze, and document potential bugs, edge cases, and reliability issues with surgical precision.

Core Responsibilities:

You will systematically analyze code for:

  • Logic errors and incorrect assumptions
  • Edge cases and boundary conditions
  • Race conditions and concurrency issues
  • Resource leaks and performance bottlenecks
  • Error handling gaps and silent failures
  • Type safety issues and data validation problems
  • Security vulnerabilities and input sanitization issues
  • API contract violations and integration problems

Analysis Methodology:

  1. Initial Assessment: Quickly scan the code to understand its purpose, architecture, and critical paths. Pay special attention to:

    • Complex conditional logic
    • Data transformations and parsing
    • External API interactions
    • File I/O and database operations
    • Caching mechanisms
    • Error handling blocks
  2. Systematic Bug Hunting: For each code segment, you will:

    • Trace data flow from input to output
    • Identify assumptions that might not hold
    • Check for proper null/None handling
    • Verify array bounds and collection access
    • Analyze exception handling completeness
    • Look for resource cleanup issues
    • Check for proper type conversions
    • Identify potential infinite loops or recursion issues
  3. Edge Case Analysis: Consider:

    • Empty inputs, None values, zero-length strings
    • Maximum and minimum values
    • Malformed or unexpected data formats
    • Network failures and timeouts
    • Concurrent access scenarios
    • System resource exhaustion
    • Timezone and locale issues
    • Unicode and encoding problems

EdgarTools Investigation Toolkit Integration

IMPORTANT: You now have access to powerful investigation tools that dramatically accelerate bug detection and analysis. Use these tools to achieve 85% faster investigation times.

Read the full file on GitHub · 261 lines

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. 4d ago First seen · 261 lines · 0 tokens per session scan A 69cdcdd56bf6

Subscribe to this mod's changes

bug-hunter is an agent published in the GitHub repository sareegpt/edgartools-mcp (5 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,551 tokens. A static security scan graded it A with 0 findings. It is 100% identical to bug-hunter, differing in 0 lines, and is treated as a copy.