CtrlK
BlogDocsLog inGet started
Tessl Logo

hunt-race-condition

Hunting skill for race condition vulnerabilities. Built from 12 public bug bounty reports including modern HTTP/2 single-packet attack cases (James Kettle DEF CON 2023 "Smashing the State Machine"; RyotaK / Flatt Security 10,000-request first-sequence-sync expansion 2024). Covers coupon double-redemption, gift-card double-spend, MFA-OTP-validate race, account-create race, faucet/crypto token double-mint, email-activation race, vote/upvote inflation, password-reset token race, rate-limit bypass via concurrent requests. Use when hunting race conditions, TOCTOU bugs, MFA-bypass-via-timing.

72

Quality

88%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

View guide

SecuritybySnyk

Critical

Do not install without reviewing

SKILL.md
Quality
Evals
Security

Quality

Content

77%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A dense, actionable hunting skill with executable code and a well-sequenced validation-backed workflow. Its main weaknesses are repeated treatment of the single-packet technique and a monolithic structure that keeps a large deep-reference inline rather than behind a reference file.

Suggestions

Consolidate the single-packet explanation so it appears once in full (e.g. the deep reference) and is only cross-referenced elsewhere, trimming the duplicated framing in 'Firing a race', the operator playbook, and anti-patterns.

Move the 'HTTP/2 Single-Packet Attack — Deep Reference' section into a references/ file (e.g. references/single-packet-attack.md) and link to it one level deep, so the SKILL.md body stays a concise overview.

Tighten the 'Real Impact Examples' scenarios, which narrate context the hunter largely already infers, to one-line summaries pointing at the Disclosed Report Citations.

DimensionReasoningScore

Conciseness

The body is dense and free of beginner filler, but the single-packet technique is explained repeatedly across 'Firing a race', the deep reference, the operator playbook, and anti-patterns, so it could be tightened despite being accurate.

2 / 3

Actionability

Provides fully executable Turbo Intruder, curl, and asyncio code plus concrete grep patterns and specific endpoint lists that are copy-paste ready, rather than abstract instruction.

3 / 3

Workflow Clarity

The 10-step methodology sequences clearly with explicit validation checkpoints (steps 7, 8, 10) and the 'Gate 0 Validation' section supplies a feedback loop for reproducibility before reporting.

3 / 3

Progressive Disclosure

The file is a well-organized single ~480-line monolith with no bundle files or one-level-deep references; content that could be split (the long HTTP/2 deep reference) is kept inline, so navigation is structural rather than file-based.

2 / 3

Total

10

/

12

Passed

Description

100%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is concrete, third-person, and covers both capabilities and explicit use triggers. It lists specific vulnerability classes and natural trigger terms without vague fluff or over-claims.

DimensionReasoningScore

Specificity

Lists multiple concrete actions such as 'coupon double-redemption, gift-card double-spend, MFA-OTP-validate race, account-create race, faucet/crypto token double-mint', naming specific vulnerability classes rather than abstract language.

3 / 3

Completeness

Explicitly answers both what it covers (the enumerated vulnerability classes) and when to use it via the explicit 'Use when hunting race conditions, TOCTOU bugs, MFA-bypass-via-timing' clause.

3 / 3

Trigger Term Quality

Covers natural hunter-facing terms in the trigger clause — 'race conditions, TOCTOU bugs, MFA-bypass-via-timing' — plus specific high-signal terms like 'single-packet attack' and 'rate-limit bypass' a user would actually say.

3 / 3

Distinctiveness Conflict Risk

Occupies a clear niche (race-condition hunting) with distinct, specialized triggers unlikely to fire for unrelated skills; the single-packet and TOCTOU framing distinguishes it from general web-testing skills.

3 / 3

Total

12

/

12

Passed

Validation

93%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation15 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

frontmatter_unknown_keys

Unknown frontmatter key(s) found; consider removing or moving to metadata

Warning

Total

15

/

16

Passed

Repository
elementalsouls/Claude-BugHunter
Reviewed

Table of Contents

Is this your skill?

If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.