security-test-planning

security-test-planning is a skill for Claude Code from arozumenko/sdlc-skills. It costs 51 tokens per session (1,133 once invoked), scanned A, original, MIT.

A tool for turning security concerns into passive manual test cases. Passive cases observe results without changing the system, and the tool checks whether their step tables follow the allowed format.

In plain words
What is it for?
Use it to draft or process cases from a threat model, check their filenames and fields, lint their steps, and hand off the admitted test suite.
Why use it?
It removes ambiguity about whether a proposed security test is written in an acceptable form. Admission by lint only classifies the wording; it does not prove the target is safe.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the sdlc-skills plugin — 60 skills shipped together

Good fit Use it to draft or process cases from a threat model, check their filenames and fields, lint their steps, and hand off the admitted test suite.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/arozumenko/sdlc-skills/security-test-planning
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 arozumenko/sdlc-skills --skill security-test-planning
Clone the repo
git clone --depth 1 https://github.com/arozumenko/sdlc-skills

Made for: Claude Code.

Or install sdlc-skills, the plugin that ships this one along with the rest of its 60 skills.

Its marketplace also offers this one on its own, as the plugin security-test-planning — /plugin install security-test-planning after adding the marketplace above.

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 security-test-planning

README.md
[![agentmods](https://agentmods.dev/badge/skills/arozumenko/sdlc-skills/security-test-planning/github.svg)](https://agentmods.dev/skills/arozumenko/sdlc-skills/security-test-planning)
Your own site
<a href="https://agentmods.dev/skills/arozumenko/sdlc-skills/security-test-planning"><img src="https://agentmods.dev/badge/skills/arozumenko/sdlc-skills/security-test-planning/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 security-test-planning

Your own site · 80×15
<a href="https://agentmods.dev/skills/arozumenko/sdlc-skills/security-test-planning"><img src="https://agentmods.dev/badge/skills/arozumenko/sdlc-skills/security-test-planning.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,133 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 $0.00051 $0.01133
Opus 5.5 $0.00020 $0.00453
Sonnet 5.5 $0.00010 $0.00227
Haiku 4.5 $0.00005 $0.00113

Measured 1mo ago against content hash 641f81164086, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

security-test-planning 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 1mo ago.

The scan reads SKILL.md. This mod also ships 7 executable files (scripts/cases.mjs, scripts/cases.test.mjs, scripts/lib/admission.mjs, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

bundles/security-testing/skills/security-test-planning/SKILL.md · 98 lines

How it starts

The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Security test planning

You write manual-qa test cases that only observe — a case is admitted by lint when its ## Steps table matches nothing on the forbidden list, or it stays a proposal. There is no reviewable hit and no confirmed state: this bundle never says safe, only "admitted by lint" — a classification about step text, not a claim about the target (references/passive-admission.md).

Where a candidate lives

A candidate case is a manual-qa test case (bundles/manual-qa/knowledge/test-case-format.md) at .agents/security-testing/cases/TC-NNN_<slug>.md — directly under cases/, no per-case subdirectory. The file name must match TC-NNN_<slug>.md and its frontmatter id: must be that same TC-NNN. Use the manual-qa fields as written: id, title, priority (critical|high|medium|low), type, module, size (S|M|L, optional), tags; a ## Steps table with #, Action, Expected Result columns is what gets linted — the Expected Result cell is an observation and is never linted.

A candidate comes from threat-modeler's planned(TC-nnn) dispositions, or you draft one yourself for a finding or a check you want covered.

The admission grammar, in short

Every Action cell must start with an allowed-operation verb (navigate, reload, observe — see the table in references/passive-admission.md) after leading Markdown emphasis is stripped. Anything else is an unknown-operation hit. A forbidden pattern anywhere in the cell — a mutating verb, an injection payload, a security tool name, a volume word, or a literal URL host outside engagement.md targets.browser — is its own hit (references/passive-admission.md has the full rule table). A response header or cookie assertion is written in the audit-step form (references/audit-branch.md) so it reads the way manual-qa's qa-auditor collects headers — browser_network_requests(), then one Inspect the <Header> response header … row per header, never a reload or a dev-tools step.

Read the full file on GitHub · 98 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. 1mo ago First seen · 98 lines · 51 tokens per session scan A 641f81164086

Subscribe to this mod's changes

security-test-planning is a skill published in the GitHub repository arozumenko/sdlc-skills (25 stars, last pushed yesterday), licensed MIT. It adds 51 tokens to every session and 1,133 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-19.

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