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Agent skill

Syzkaller Build Loop

by benchflow-ai in benchflow-ai/skillsbench

Full build workflow for adding new syscall descriptions to syzkaller

Apache-2.0Auto-check passed

Install Syzkaller Build Loop

skills CLI
$ npx skills add benchflow-ai/skillsbench --skill syzkaller-build-loop -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install benchflow-ai/skillsbench syzkaller-build-loop --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/benchflow-ai/skillsbench.git skills-src && mkdir -p .claude/skills && cp -r skills-src/tasks/syzkaller-ppdev-syzlang/environment/skills/syzkaller-build-loop .claude/skills/syzkaller-build-loop && rm -rf skills-src

Use ~/.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/

Facts

Skill name
syzkaller-build-loop
GitHub stars
1.8k
Token cost
~456 tokens
SKILL.md length
142 words
Files
1
Skills in repo
189
Repo updated
First seen
Licence
Apache-2.0

At a glance

Full build workflow for adding new syscall descriptions to syzkaller

  • SKILL.md covers Full Build Loop for New…, Quick Rebuild (After Minor…, Common Errors and Exploring Existing Code, plus 1 more section
  • Calls make

What it does

Syzkaller Build Loop is an agent skill from benchflow-ai/skillsbench. Full build workflow for adding new syscall descriptions to syzkaller

Its SKILL.md is about 460 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Linux. The repository describes itself as: SkillsBench evaluates how well skills work and how effective agents are at using them. The licence is Apache-2.0.

Example prompts

  • “/syzkaller-build-loop”

What it can do on your machine

Read from SKILL.md and the folder at commit 9a1f4dd. 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

    Shell commands in SKILL.md call:

    • make

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    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

Syzkaller Build Loop loads about 456 tokens when it runs. Until then it costs about 22 tokens; SKILL.md has 142 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~22
When it runs · the whole SKILL.md, loaded when a task matches
~456

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 benchflow-ai/skillsbench at commit 9a1f4dd, republished under its Apache-2.0 licence (© benchflow-ai). 142 words, ~456 tokens.

Download SKILL.mdSave it as .claude/skills/syzkaller-build-loop/SKILL.md (or your agent's skills folder).
name
syzkaller-build-loop
description
Full build workflow for adding new syscall descriptions to syzkaller

Syzkaller Description Workflow

Full Build Loop for New Descriptions

When adding new syscall descriptions, follow this workflow:

bash
cd /opt/syzkaller

# 1. Write/edit your .txt file in sys/linux/

# 2. Create a .const file with constant values (see syz-extract-constants skill)
#    The .const file should be named: sys/linux/your_file.txt.const

# 3. Compile descriptions
make descriptions

# 4. Build syzkaller
make all

Quick Rebuild (After Minor Edits)

If you only changed descriptions (not constants):

bash
cd /opt/syzkaller
make descriptions   # Runs syz-sysgen to compile descriptions

If you add new constants, update the .const file first.

Common Errors

Unknown type
unknown type foo_bar
  • Type not defined, or defined after first use
  • Define all types before using them
Constant not available / defined for none of the arches
SOME_CONST is defined for none of the arches
  • The constant isn't in the .const file
  • Add it to sys/linux/your_file.txt.const with the correct value
Missing reference
undefined reference to 'some_type'
  • Type defined in another file not being found
  • Check includes or existing type definitions

Exploring Existing Code

Find examples of patterns:

bash
grep -r "pattern" /opt/syzkaller/sys/linux/

Useful searches:

  • resource fd_ - How other fd resources are defined
  • ioctl\$ - Ioctl definition patterns
  • read\$ / write\$ - Read/write specializations
  • struct.*{ - Struct definition patterns

Files to Reference

  • sys/linux/socket.txt - Network types (ifreq_t, sockaddr, etc.)
  • sys/linux/sys.txt - Basic syscall patterns
  • sys/linux/fs.txt - File operations

© benchflow-ai, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in tasks/syzkaller-ppdev-syzlang/environment/skills/syzkaller-build-loop of benchflow-ai/skillsbench.

Open the folder on GitHubat commit 9a1f4dd

Compare with similar skills

Syzkaller Build Loop 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.

Syzkaller Build Loop compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Syzkaller Build Loop this skillbenchflow-ai/skillsbench1.8k—~456Automated safety check: PassApache-2.0
Configuring Horizoncoollabsio/coolify63k4 repos~898Automated safety check: PassMIT
Model Usageopenclaw/openclaw392k1 repos~637Automated safety check: PassMIT
Engine Whats Newflutter/flutter179k—~978Automated safety check: PassBSD-3-Clause
Openclaw Live Updateropenclaw/openclaw392k—~3.7kAutomated safety check: PassMIT
Upgrade Browserflutter/flutter179k—~1.1kAutomated safety check: PassBSD-3-Clause

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Works with

Questions about Syzkaller Build Loop

What does Syzkaller Build Loop do?

Full build workflow for adding new syscall descriptions to syzkaller. Syzkaller Build Loop is an agent skill from benchflow-ai/skillsbench.

How do I install Syzkaller Build Loop in Claude Code?

Run `npx skills add benchflow-ai/skillsbench --skill syzkaller-build-loop -a claude-code`. Or copy the skill folder (tasks/syzkaller-ppdev-syzlang/environment/skills/syzkaller-build-loop in benchflow-ai/skillsbench) into .claude/skills/syzkaller-build-loop in your project. Claude Code loads it when a task matches its description.

How do I install Syzkaller Build Loop in Codex?

Run `npx skills add benchflow-ai/skillsbench --skill syzkaller-build-loop -a codex`. Or copy the skill folder (tasks/syzkaller-ppdev-syzlang/environment/skills/syzkaller-build-loop in benchflow-ai/skillsbench) into .agents/skills/syzkaller-build-loop in your project. Codex loads it when a task matches its description.

Can I use Syzkaller Build Loop 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 benchflow-ai/skillsbench --skill syzkaller-build-loop -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/syzkaller-build-loop, .gemini/skills/syzkaller-build-loop, .github/skills/syzkaller-build-loop and .opencode/skills/syzkaller-build-loop in your project.

What does Syzkaller Build Loop need to run?

Going by SKILL.md and its folder, Syzkaller Build Loop needs the command-line tools its instructions call (make).

Does Syzkaller Build Loop access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Syzkaller Build Loop 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 Syzkaller Build Loop use?

Syzkaller Build Loop is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Syzkaller Build Loop use?

About 456 tokens (SKILL.md is roughly 1.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Syzkaller Build Loop?

Skills that share tags, products or a category with Syzkaller Build Loop: Configuring Horizon (coollabsio/coolify, 63k stars), Model Usage (openclaw/openclaw, 392k stars), Engine Whats New (flutter/flutter, 179k stars) and Openclaw Live Updater (openclaw/openclaw, 392k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Syzkaller Build Loop?

benchflow-ai (a GitHub organization) maintains it in benchflow-ai/skillsbench, which has 1,835 GitHub stars. The repository holds 189 skills in this directory. The repository was last updated on July 23, 2026.

Source: benchflow-ai/skillsbench on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.