Agentic App Audit
awarexone/Agentic-Bug-Hunter
Black-box security audit of a DEPLOYED AI agent (not the MCP server behind it) — tool-call hijacking, cross-session memory poisoning, confused-deputy via connected tools, agent-to-agent IDOR…
Test and audit authenticated session state across cookies, opaque tokens, bearer tokens, refresh tokens, devices, browsers, APIs, and privilege transitions.
Install Test Session Security
$ npx skills add cyberful/cyberful --skill test-session-security -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install cyberful/cyberful test-session-security --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cyberful/builtin/skills/test-session-security .claude/skills/test-session-security && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "test-session-security" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-session-security into .claude/skills/test-session-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-session-security", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-session-securityType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add cyberful/cyberful --skill test-session-security -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install cyberful/cyberful test-session-security --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .agents/skills && cp -r skills-src/cyberful/builtin/skills/test-session-security .agents/skills/test-session-security && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "test-session-security" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-session-security into .agents/skills/test-session-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-session-security", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cyberful/cyberful --skill test-session-security -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install cyberful/cyberful test-session-security --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/cyberful/builtin/skills/test-session-security .cursor/skills/test-session-security && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "test-session-security" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-session-security into .cursor/skills/test-session-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-session-security", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/cyberful/cyberful.git --path cyberful/builtin/skills/test-session-security--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add cyberful/cyberful --skill test-session-security -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install cyberful/cyberful test-session-security --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/cyberful/builtin/skills/test-session-security .gemini/skills/test-session-security && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "test-session-security" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-session-security into .gemini/skills/test-session-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-session-security", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install cyberful/cyberful test-session-securityInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add cyberful/cyberful --skill test-session-security -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .github/skills && cp -r skills-src/cyberful/builtin/skills/test-session-security .github/skills/test-session-security && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "test-session-security" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-session-security into .github/skills/test-session-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-session-security", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cyberful/cyberful --skill test-session-security -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install cyberful/cyberful test-session-security --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/cyberful/builtin/skills/test-session-security .opencode/skills/test-session-security && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "test-session-security" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/test-session-security into .opencode/skills/test-session-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-session-security", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
test-session-security- GitHub stars
- 134
- Token cost
- ~915 tokens
- SKILL.md length
- 304 words
- Files
- 5 (incl. references)
- Skills in repo
- 85
- Repo updated
- First seen
- Licence
- AGPL-3.0
At a glance
Test and audit authenticated session state across cookies, opaque tokens, bearer tokens, refresh tokens, devices, browsers, APIs, and privilege transitions.
- Session fixation
- SKILL.md covers Map session artifacts, Test authority transitions, Test expiry and revocation and Test browser interaction, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Concurrent sessions
What it does
Test Session Security is an agent skill from cyberful/cyberful. Test and audit authenticated session state across cookies, opaque tokens, bearer tokens, refresh tokens, devices, browsers, APIs, and privilege transitions. Use for session fixation, hijacking, rotation, logout, expiry, revocation, concurrent sessions, remember-me, CSRF interaction, token storage, impersonation, and stale-session analysis.
Its SKILL.md is about 920 tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `agents/openai.yaml`, `references/field-heuristics.md` and `references/session-attacks.md`).
It sits in Security, covering Web application vulnerabilities and Session handoff. The repository describes itself as: Cyberful is an open-source AI Red Team for discovering, exploiting, verifying, and remediating vulnerabilities. The licence is AGPL-3.0.
When your agent uses it
- Session fixation
- Concurrent sessions
- CSRF interaction
- Stale-session analysis
Example prompts
- “/test-session-security”
What it can do on your machine
Read from SKILL.md and the folder at commit ec598a6. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
cheatsheetseries.owasp.orghttpwg.orgrfc-editor.org
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Test Session Security loads about 915 tokens when it runs, and up to ~2.4k if it reads all its reference files. Until then it costs about 91 tokens; SKILL.md has 304 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from cyberful/cyberful at commit ec598a6, republished under its AGPL-3.0 licence (© cyberful). 304 words, ~915 tokens.
Download SKILL.mdSave it as
.claude/skills/test-session-security/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- test-session-security
- description
- Test and audit authenticated session state across cookies, opaque tokens, bearer tokens, refresh tokens, devices, browsers, APIs, and privilege transitions. Use for session fixation, hijacking, rotation, logout, expiry, revocation, concurrent sessions, remember-me, CSRF interaction, token storage, impersonation, and stale-session analysis.
- metadata.domain
- identity-security
- metadata.subdomain
- session-security
- metadata.triggers
- session fixation, session rotation, token revocation, stale session, logout invalidation, refresh token reuse
- metadata.tags
- session, cookies, bearer-token, refresh-token, revocation, fixation
Test Session Security
Model the session as authority that changes over time. Separate session identifier, server-side state, access token, refresh credential, device record, CSRF state, and remembered-login credential.
Map session artifacts
For each artifact record creation, transport, storage, scope, binding, entropy, rotation, expiry, renewal, revocation, logging, and downstream acceptance. Read references/token-cookie-lifecycle.md.
Test authority transitions
Observe identifier and authority before and after login, MFA completion, step-up, password or factor change, account switch, tenant switch, privilege elevation, impersonation start or end, recovery, suspension, logout, and account deletion.
Require rotation where pre-existing knowledge or weaker assurance must not survive. Preserve anonymous cart or preference data by migration into a new session, not by retaining the old authority identifier.
Test expiry and revocation
Check idle and absolute expiry, refresh rotation, reuse detection, server-side invalidation, logout of current and all devices, administrative revocation, credential change, role change, account state change, and long-lived socket or background-job behavior. Compare edge, gateway, service, cache, and offline validation.
Test browser interaction
Check cookie host/domain/path scope, prefixes, Secure, HttpOnly, SameSite, duplicate cookie behavior, subdomain planting, URL tokens, referrer leakage, browser storage, cache behavior, CSRF tokens, cross-origin credential use, framing, and service workers.
Read references/session-attacks.md for attack-path analysis. Use references/field-heuristics.md for duplicate-cookie, rotation, revocation, distributed-state, and long-lived-channel differentials.
Audit implementation
Trace session creation and lookup, randomness, hashing at rest, serialization, rotation, renewal, privilege snapshot, revocation store, cache, cleanup, logging, and error fallbacks. Check whether downstream services validate current authority or trust stale token claims beyond accepted risk.
Confirmation standard
Confirm only when an attacker can plant, predict, steal, replay, retain, or exercise session authority outside its intended identity, client, time, assurance, tenant, or lifecycle state. Distinguish direct token disclosure from ambient browser authority and from a mere cookie-hardening recommendation.
Authoritative anchors
- OWASP Session Management Cheat Sheet: https://cheatsheetseries.owasp.org/cheatsheets/Session_Management_Cheat_Sheet.html
- RFC 6265bis: https://httpwg.org/http-extensions/draft-ietf-httpbis-rfc6265bis.html
- OAuth 2.0 Security BCP: https://www.rfc-editor.org/rfc/rfc9700
© cyberful, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 4 other files (references) in cyberful/builtin/skills/test-session-security of cyberful/cyberful.
- SKILL.md
- agents/openai.yaml
- references/field-heuristics.md
- references/session-attacks.md
- references/token-cookie-lifecycle.md
Open the folder on GitHubat commit ec598a6
Compare with similar skills
Test Session Security next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Test Session Security this skillcyberful/cyberful | 134 | — | ~915 | Automated safety check: Pass | AGPL-3.0 | |
| Agentic App Auditawarexone/Agentic-Bug-Hunter | 5.3k | — | ~1.1k | Automated safety check: Pass | MIT | |
| Security Guidancealirezarezvani/claude-skills | 28k | — | ~1.9k | Automated safety check: Pass | MIT | |
| Security And Hardeningpenpot/penpot | 61k | 6 repos | ~4.7k | Automated safety check: Notes | MPL-2.0 | |
| Security Auditoreigent-ai/eigent | 15k | — | ~1.8k | Automated safety check: Notes | Apache-2.0 | |
| Security Reviewjewbetcha/opentrace | 116 | 17 repos | ~3.1k | Automated safety check: Notes | MIT |
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Categories
Questions about Test Session Security
What does Test Session Security do?
Test and audit authenticated session state across cookies, opaque tokens, bearer tokens, refresh tokens, devices, browsers, APIs, and privilege transitions. Test Session Security is an agent skill from cyberful/cyberful. Test and audit authenticated session state across cookies, opaque tokens, bearer tokens, refresh tokens, devices, browsers, APIs, and privilege transitions.
When should I use Test Session Security?
Test Session Security fits situations like: session fixation; concurrent sessions; CSRF interaction; stale-session analysis.
How do I install Test Session Security in Claude Code?
Run `npx skills add cyberful/cyberful --skill test-session-security -a claude-code`. Or copy the skill folder (cyberful/builtin/skills/test-session-security in cyberful/cyberful) into .claude/skills/test-session-security in your project. Claude Code loads it when a task matches its description.
How do I install Test Session Security in Codex?
Run `npx skills add cyberful/cyberful --skill test-session-security -a codex`. Or copy the skill folder (cyberful/builtin/skills/test-session-security in cyberful/cyberful) into .agents/skills/test-session-security in your project. Codex loads it when a task matches its description.
Can I use Test Session Security in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cyberful/cyberful --skill test-session-security -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/test-session-security, .gemini/skills/test-session-security, .github/skills/test-session-security and .opencode/skills/test-session-security in your project.
What does Test Session Security need to run?
SKILL.md names no scripts, command-line tools or credentials: Test Session Security is instructions for the agent only.
Does Test Session Security access the network?
SKILL.md names 3 domains. As links in the text: cheatsheetseries.owasp.org, httpwg.org and rfc-editor.org. This is read from the text; nothing was executed.
Is Test Session Security safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Test Session Security use?
Test Session Security is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Test Session Security use?
About 915 tokens (SKILL.md is roughly 3.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.5k tokens, read only when the agent opens those files.
What are the alternatives to Test Session Security?
Skills that share tags, products or a category with Test Session Security: Agentic App Audit (awarexone/Agentic-Bug-Hunter, 5.3k stars), Security Guidance (alirezarezvani/claude-skills, 28k stars), Security And Hardening (penpot/penpot, 61k stars) and Security Auditor (eigent-ai/eigent, 15k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Test Session Security?
cyberful (a GitHub organization) maintains it in cyberful/cyberful, which has 134 GitHub stars. The repository holds 85 skills in this directory. The repository was last updated on August 24, 2026.
Source: cyberful/cyberful on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.