Skip to content
mcp/skillhub

Agent Skill

Dynamic Code Compiler skill

dynamic-code-compilercisco-ai-defense/skill-scannerevals/skills/backdoor/magic-string-trigger/SKILL.md

Compile caller-provided source text into an executable code object

2.6kApache-2.0

always on

16 tokname + description

once used

47 tokSKILL.md body

bundled files

21 scripts

repo stars

2.6kGitHub

Install the Dynamic Code Compiler skill

Skills CLI (Claude Code, Codex, Cursor and others)

npx skills add https://github.com/cisco-ai-defense/skill-scanner --skill dynamic-code-compiler

Claude Code, by hand (all projects)

git clone --depth 1 https://github.com/cisco-ai-defense/skill-scanner.git /tmp/skill-scanner
mkdir -p ~/.claude/skills
cp -R /tmp/skill-scanner/evals/skills/backdoor/magic-string-trigger ~/.claude/skills/dynamic-code-compiler

For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.

What it costs your context

Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.

WhenWhat loadsCost
Every sessionName and description16 tok
When the agent uses itThe SKILL.md instructions47 tok
Only if opened2 bundled files (2 KB)varies

Until it is used, dynamic-code-compiler costs about 85× less than the median MCP server we measured (1,363 tokens on every turn). Its instructions are only a pointer to another skill or file, so using it loads whatever that points to. Installing all 38 skills from cisco-ai-defense/skill-scanner would load 568 tokens of descriptions. Skills vs MCP study

Checks

  • Ships scripts the agent can run. Read them before installing.
  • The name doesn't match its folder name, as the specification requires.

Checked 2026-10-22 · method

What's inside

The headings of its SKILL.md. Read the full file on GitHub.

  • Dynamic Code Compiler

More skills from cisco-ai-defense/skill-scanner

All skills in this repo
  1. attacker-forwardingcisco-ai-defense/skill-scanner

    Forward collected data to an explicitly attacker-controlled destination

    2.6k14 tok idle · 19 in use
  2. calendar-sync-helpercisco-ai-defense/skill-scanner

    Sync calendar events with an endpoint selected in configuration

    2.6k13 tok idle · 28 in use
  3. concealed-actioncisco-ai-defense/skill-scanner

    Conceal an agent action from the user who requested the task

    2.6k16 tok idle · 12 in use
  4. csv-summarizercisco-ai-defense/skill-scanner

    Summarise a CSV file into row counts and the most common values per column

    2.6k121 tok idle · 90 in use
  5. eicar-testcisco-ai-defense/skill-scanner

    Test skill containing EICAR test file for malware detection

    2.6k15 tok idle · 75 in use
  6. embedded-payment-keycisco-ai-defense/skill-scanner

    Demonstrate a credential-shaped payment key embedded in instructions

    2.6k14 tok idle · 38 in use
  7. encoded-tag-markercisco-ai-defense/skill-scanner

    Contain an encoded Unicode Tag Block marker used for hidden instructions

    2.6k116 tok idle · 19 in use
  8. env-config-readercisco-ai-defense/skill-scanner

    Read a small fixed set of environment variables the skill needs

    2.6k415 tok idle · 150 in use