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ssti

ssti is a skill for Claude Code from securityfortech/hacking-skills. It costs 118 tokens per session (1,749 once invoked), scanned A, original, no licence file.

A security-testing guide for server-side template injection (SSTI), where input is inserted into a server template and evaluated as template instructions.

In plain words
What is it for?
It is for testing template engines such as Jinja2, Twig, Freemarker, Pebble, Velocity, Smarty, and Mako with expression inputs.
Why use it?
It helps find template handling that may allow an attacker to execute unintended expressions and, in some engines, reach the server's command execution.

Skill for Claude Code

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

Part of the web plugin — 28 skills shipped together

not rated 21repo +1 7mo ago A scan 118 tokens no licence

Good fit It is for testing template engines such as Jinja2, Twig, Freemarker, Pebble, Velocity, Smarty, and Mako with expression inputs.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/securityfortech/hacking-skills/ssti
View source ↗ securityfortech/hacking-skills
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 securityfortech/hacking-skills --skill ssti
Clone the repo
git clone --depth 1 https://github.com/securityfortech/hacking-skills

Made for: Claude Code.

Or install web, the plugin that ships this one along with the rest of its 28 skills.

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 ssti

README.md
[![agentmods](https://agentmods.dev/badge/skills/securityfortech/hacking-skills/ssti/github.svg)](https://agentmods.dev/skills/securityfortech/hacking-skills/ssti)
Your own site
<a href="https://agentmods.dev/skills/securityfortech/hacking-skills/ssti"><img src="https://agentmods.dev/badge/skills/securityfortech/hacking-skills/ssti/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 ssti

Your own site · 80×15
<a href="https://agentmods.dev/skills/securityfortech/hacking-skills/ssti"><img src="https://agentmods.dev/badge/skills/securityfortech/hacking-skills/ssti.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 118 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,749 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 $0.00118 $0.01749
Opus 5.5 $0.00047 $0.00700
Sonnet 5.5 $0.00024 $0.00350
Haiku 4.5 $0.00012 $0.00175

Measured 2mo ago against content hash d68700fb4630, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ssti 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 2mo 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.

compatibility: Designed for Claude Code. Requires curl, Burp Suite; tplmap (optional).
skills/web/injection/ssti/SKILL.md · 128 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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. 2mo ago First seen · 128 lines · 118 tokens per session scan A d68700fb4630

Subscribe to this mod's changes

ssti is a skill published in the GitHub repository securityfortech/hacking-skills (21 stars, last pushed 7mo ago), with no licence file. It adds 118 tokens to every session and 1,749 once invoked, about $0.0005 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 2026-08-30.

Security
Related

ssti compared with skills from other repositories

ssti next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
sstisecurityfortech/hacking-skillsSkill217mo agononeA118Claude Code
imagegenopenai/codexSkill133kyesterdayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143kyesterdayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143kyesterdayMITA103Claude Code