race-condition-single-packet SKILL.md skillA
race-condition-single-packet from dreadnode/capabilities is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dreadnode/capabilities/race-condition-single-packet@git:20260703.fddb0c9Pins git:20260703.fddb0c9 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dreadnode/capabilities
- Path
capabilities/web-security/skills/race-condition-single-packet/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260703.fddb0c9, committed Jul 3, 2026
- First version recorded
- May 4, 2026
- Size
- 5,792 bytes
- Repository stars
- 22
- License
- MIT
Single-packet race conditions for exploiting multi-step flows via precise HTTP/2 request synchronization. Use when target has state-changing operations with limit checks, balance validation, or multi-step logic.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Race Condition (Single-Packet Attack) ## Targets Count-gated limits are the highest-yield targets. Any check-then-act pattern where a count/balance/state is read in one query and modified in a separate query is vulnerable if there's no locking between them. - Resource creation limits (groups, members, webhooks, tokens, schedules) - Coupon/discount/promo code application (use-once logic) - Balance deductions (insufficient funds check) - Vote/like/rating limits - 2FA or email verification token validation - Inventory/stock checks during purchase ### Detection (Source Code) For Rails apps, grep for the anti-pattern: ```bash # Count-gated validations without locking grep -rn "validate.*on.*:create\|exceeded?\|count.*<.*limit\|offset.*exists" app/models/ grep -rn "enforce_.*limit\|limit_reached?\|quota_exceeded?\|seat_available?" app/ # Rails Limitable concern (systemic — all models using it are vulnerable) grep -rn "include Limitable" app/models/ ``` For Django/Python apps: ```bash # Count checks before creation grep -rn "\.count()\|\.filter(.*).exists()\|len(.*objects" --include="*.py" grep -rn "if.*>=.*limit\|if.*>=.*max\|quota.*exceeded" --include="*.py" ``` …
Read the whole file at its exact version.
How to install
mdr add dreadnode/capabilities/race-condition-single-packet@sha256:17845a0c0f89008fThe line at the top of this page pins the label git:20260703.fddb0c9, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ev4nk3n6bsoeqhnv)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between May 4, 2026 and Jul 3, 2026, about one every 30 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260703.fddb0c9 latest | 2026-07-03 | fddb0c9 | 5,792 B | A | view · diff |
| git:20260529.8f6ea0e | 2026-05-29 | 8f6ea0e | 2,249 B | A | view · diff |
| git:20260504.2a64374 | 2026-05-04 | 2a64374 | 1,617 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5792 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
dreadnode/capabilities · 22 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ev4nk3n6bsoeqhnv GET https://markdownregistry.com/api/v1/resolve?ref=dreadnode/capabilities/race-condition-single-packet GET https://markdownregistry.com/api/v1/blob/17845a0c0f89008f454a545d6936fe84a84957047ac682c47d0369ecb8bf7621
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.