defending-code plugin
Security find-and-fix loop — adapted (Apache-2.0) from anthropics/defending-code-reference-harness and generalised to all vulnerability classes. Four read/write-only skills (no target-code execution): threat-model (bootstrap from code+CVEs+git-history, or interview an owner via Shostack's four questions, or both -> THREAT_MODEL.md), vuln-scan (static source review, parallel per-focus-area subagents -> VULN-FINDINGS.json), triage (adversarial N-vote verification, 16 false-positive exclusion rules, root-cause dedup, impact-on-asset x exploitability severity with stated deployment conditions, owner routing, checkpoint/resume -> TRIAGE.json), and patch (root-cause candidate diffs + independent reviewer, fix-first priority for deployment-conditional dangerous primitives, never auto-applied -> PATCHES/). The autonomous C/C++ + AddressSanitizer execution pipeline this was extracted from is referenced, not bundled (vuln-scan/HARNESS.md).
How to install the defending-code plugin
Run both commands inside Claude Code. The first adds the marketplace once; the second installs the plugin.
/plugin marketplace add air-gapped/skills
/plugin install defending-code@air-gapped-marketplaceWhat's inside defending-code
10 parts read from the plugin's own files.
Agents 6
Call as @agent-defending-code:name- @agent-defending-code:patch-author
Patch author for one verified vulnerability finding in a patch run. Spawn with a repo path and a nonce-tagged finding block — not for general delegation.
- @agent-defending-code:patch-reviewer
Independent reviewer for one candidate security patch in a patch run. Spawn with a repo path, location, category, and nonce-tagged diff — not for general delegation.
- @agent-defending-code:triage-ranker
Severity ranker for one confirmed triage finding. Spawn with a repo path, deployment context, and finding fields — not for general delegation.
- @agent-defending-code:triage-verifier
Adversarial verifier for one scanner finding in a triage run. Spawn with a repo path, environment, and finding block — not for general delegation.
- @agent-defending-code:vuln-area-reviewer
Static security reviewer for one focus area of a vuln-scan run. Spawn with a focus area, target dir, and scoping facts — not for general delegation.
- @agent-defending-code:vuln-confidence-scorer
Second-opinion confidence scorer for one vuln-scan finding. Spawn with a finding block and target dir — not for general delegation.
Skills 4
Claude loads it when the task matches- patch
Generates candidate security fix diffs from verified findings using static analysis or execution-verified pipelines.
- threat-model
Builds a structured threat model for a codebase using interview, bootstrap, or hybrid modes to map attack surfaces and prioritize security risks.
- triage
Triages security findings by verifying authenticity, deduplicating results, and ranking them by impact and exploitability.
- vuln-scan
Performs static source-code vulnerability scans by spawning parallel subagents to review specific focus areas and generate structured findings.
Using defending-code in Claude Code
Ask for an agent by name:
@agent-defending-code:patch-author
@agent-defending-code:patch-reviewerSkills need no command. Claude reads them when your request matches what they describe.
Update, turn off or remove
- Update the plugin (shell)
- claude plugin update defending-code@air-gapped-marketplace
- Refresh the marketplace
- /plugin marketplace update air-gapped-marketplace
- Turn it off for now
- /plugin disable defending-code@air-gapped-marketplace
- Remove it
- /plugin uninstall defending-code@air-gapped-marketplace
Skills in defending-code
- patchair-gapped/skills
Generates candidate security fix diffs from verified findings using static analysis or execution-verified pipelines.
6 files6stars - threat-modelair-gapped/skills
Builds a structured threat model for a codebase using interview, bootstrap, or hybrid modes to map attack surfaces and prioritize security risks.
9 files6stars - triageair-gapped/skills
Triages security findings by verifying authenticity, deduplicating results, and ranking them by impact and exploitability.
12 files6stars - vuln-scanair-gapped/skills
Performs static source-code vulnerability scans by spawning parallel subagents to review specific focus areas and generate structured findings.
5 files6stars
defending-code plugin questions
How do I install the defending-code plugin?
In Claude Code run /plugin marketplace add air-gapped/skills, then /plugin install defending-code@air-gapped-marketplace.
What does the defending-code plugin include?
defending-code bundles 6 agents, 4 skills.
Which agents come with defending-code?
patch-author, patch-reviewer, triage-ranker, triage-verifier, vuln-area-reviewer, vuln-confidence-scorer. Call one with @agent-defending-code:patch-author.
How do I update or remove the defending-code plugin?
Update it with claude plugin update defending-code@air-gapped-marketplace in your shell, or from the Installed tab of /plugin. Remove it with /plugin uninstall defending-code@air-gapped-marketplace.
What license is the defending-code plugin under?
MIT, as stated in the plugin's manifest.