web-app-testing

web-app-testing is a skill for Claude Code, Codex from oasm-platform/open-asm. It costs 53 tokens per session (1,042 once invoked), scanned A, original, GPL-3.0.

A method for safely testing the security of an authorized web application or API. It covers sign-in, permissions, injection, server-side request forgery, configuration mistakes, and exposure of sensitive data.

In plain words
What is it for?
Use it when assessing a web application or API that you are allowed to test, especially before deeper security work or a release.
Why use it?
It provides a structured way to look for common web security weaknesses without making destructive changes. It also uses safe proofs and records evidence for the assessment.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Use it when assessing a web application or API that you are allowed to test, especially before deeper security work or a release.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/oasm-platform/open-asm/web-app-testing
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.

Any agent
npx skills add oasm-platform/open-asm --skill web-app-testing
Clone the repo
git clone --depth 1 https://github.com/oasm-platform/open-asm

Made for: Claude Code, Codex.

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 web-app-testing

README.md
[![agentmods](https://agentmods.dev/badge/skills/oasm-platform/open-asm/web-app-testing/github.svg)](https://agentmods.dev/skills/oasm-platform/open-asm/web-app-testing)
Your own site
<a href="https://agentmods.dev/skills/oasm-platform/open-asm/web-app-testing"><img src="https://agentmods.dev/badge/skills/oasm-platform/open-asm/web-app-testing/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 web-app-testing

Your own site · 80×15
<a href="https://agentmods.dev/skills/oasm-platform/open-asm/web-app-testing"><img src="https://agentmods.dev/badge/skills/oasm-platform/open-asm/web-app-testing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,042 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 $0.00053 $0.01042
Opus 5.5 $0.00021 $0.00417
Sonnet 5.5 $0.00011 $0.00208
Haiku 4.5 $0.00005 $0.00104

Measured 3d ago against content hash 78e99eee9abc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

web-app-testing scanned grade A with 1 finding 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 3d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- Craft and inspect individual requests with `execute_remote_command` (`curl -sS -i …`) and read long output with `read_tool_output` and a `pattern`.
core-api/src/modules/agents/skills/web-app-testing/SKILL.md · 56 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 3d ago First seen · 56 lines · 53 tokens per session scan A 78e99eee9abc

Subscribe to this mod's changes

web-app-testing is a skill published in the GitHub repository oasm-platform/open-asm (259 stars, last pushed yesterday), licensed GPL-3.0. It adds 53 tokens to every session and 1,042 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-21.

Related

Other skills, from other repositories

business-logic

Test workflows, state transitions, pricing, and concurrency.

Strategic-Automation/violin · 15 tokens

identity-auth

Test identity, authentication, authorization, and sessions.

Strategic-Automation/violin · 13 tokens

owasp-top-10-testing

Test an application against the OWASP Top 10 with Strix — autonomous AI agents that attempt real exploits for each category of the current OWASP Top 10:2025 (broken access control including SSRF, security misconfiguration, software supply chain failures, cryptographic failures, injection, insecure design…

usestrix/strix · 151 tokens

application-security-testing

Application security testing (AppSec) across a whole product with Strix — decide which asset needs which test (source code, running web app, API, CI pipeline), run it, and turn the results into a ranked remediation plan. Autonomous agents exploit and prove each issue instead of emitting static-analysis alerts, so the…

usestrix/strix · 125 tokens

redamon-testing

How RedAmon tests actually run and how to author them: the per-file Docker gate, the unit/integration/live tiers, and the failure modes that make a green run a lie. Trigger: editing any test.py, .test.ts(x) or tests/.sh; a test that is red, skipped or xfailed; a request to "run the tests", "make it green" or check…

samugit83/redamon · 114 tokens

exploiting-jwt-algorithm-confusion-attack

Exploits JWT algorithm confusion vulnerabilities where the server's token verification library accepts the algorithm specified in the JWT header rather than enforcing a fixed algorithm. The tester manipulates the alg header to switch from RS256 to HS256 (using the RSA public key as the HMAC secret), sets alg to none…

xalgorix/xalgorix · 116 tokens