dev3000: Skill for Claude Code

.agents/skills/deepsec/SKILL.md

deepsec is a skill for Claude Code, Codex from vercel-labs/dev3000. It costs 41 tokens per session (912 once invoked), scanned A, original, MIT.

A runbook for running DeepSec against a Vercel project checkout. DeepSec is a security scanner that examines application source code and produces findings.

In plain words
What is it for?
Use it to initialize DeepSec, provide project context, run an initial scan, and create a readable security findings report.
Why use it?
It defines a bounded first-pass workflow, explains where scan state belongs, and sets rules for credentials, setup files, and generated reports.

Skill for Claude CodeCodex ✓ vendor

Written for no agent in particular: nothing here depends on one. Also seen: mentions CLAUDE.md; mentions Claude Code; installed under .agents/ (shared by several agents).

This is vercel-labs/dev3000's own configuration. It tells Claude Code and Codex how to work on dev3000 itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything dev3000 configures →

About the project

vercel-labs/dev3000 is a local web debugging runtime that records a web app's server logs, browser events, errors, network activity, interactions, and screenshots in one timestamped timeline. Coding agents use it to run and inspect web applications while reproducing bugs. Its catalogue add-ons teach agents how to operate the runtime and examine its debugging evidence.

vercel-labs/dev3000 · 1,597 stars · on GitHub · dev3000.ai

Reuse

Borrowing it

Nothing to install: this file belongs to vercel-labs/dev3000. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/vercel-labs/dev3000/main/.agents/skills/deepsec/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/vercel-labs/dev3000

Made for: Claude Code, Codex.

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 deepsec

README.md
[![agentmods](https://agentmods.dev/badge/skills/vercel-labs/dev3000/deepsec/github.svg)](https://agentmods.dev/skills/vercel-labs/dev3000/deepsec)
Your own site
<a href="https://agentmods.dev/skills/vercel-labs/dev3000/deepsec"><img src="https://agentmods.dev/badge/skills/vercel-labs/dev3000/deepsec/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 deepsec

Your own site · 80×15
<a href="https://agentmods.dev/skills/vercel-labs/dev3000/deepsec"><img src="https://agentmods.dev/badge/skills/vercel-labs/dev3000/deepsec.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 912 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium MCP Rug Pull · line 25
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
How audits are shown
Origin original 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 $0.00041 $0.00912
Opus 5.5 $0.00016 $0.00365
Sonnet 5.5 $0.00008 $0.00182
Haiku 4.5 $0.00004 $0.00091

Measured 2mo ago against content hash d09b74a1ca27, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

deepsec scanned grade A with 0 findings 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/deepsec/SKILL.md · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

DeepSec Dev3000 Runbook

Use this skill to turn the manual DeepSec workflow into a repeatable dev3000 run against the current Vercel project checkout.

Operating Policy

  • Work from the real project checkout at /workspace/repo.
  • Do not write AI credentials into .deepsec/.env.local or any tracked file. The dev3000 runtime passes AI Gateway credentials through the process environment.
  • Default dev3000 runs are a bounded first pass. Do not run an unbounded process or revalidate command unless the user explicitly asks for a full DeepSec scan in run-specific instructions.
  • Keep generated scan state in the locations DeepSec already gitignores. Commit only the durable setup/context files and human-readable findings report.
  • Treat DeepSec as a coding agent with shell access. Do not run it on untrusted source inputs.

Default Flow

  1. Inspect the project shape:
    • Read README.md if present.
    • Read AGENTS.md or CLAUDE.md if present.
    • Skim representative files for auth, middleware, request handlers, data access, billing, webhooks, and security-sensitive boundaries.
  2. Initialize DeepSec if needed:
    • If .deepsec/ is absent, run npx --yes deepsec@latest init.
    • If .deepsec/ already exists, do not force overwrite it.
  3. Install DeepSec workspace dependencies:
    • Run corepack pnpm install from .deepsec/.
    • Ensure the Claude Agent SDK native binary that DeepSec actually uses is available. Do not run a Claude Code postinstall; DeepSec uses @anthropic-ai/claude-agent-sdk.
    • If corepack pnpm is unavailable, run pnpm install only after confirming pnpm exists.
  4. Fill the generated project context:
    • Read .deepsec/node_modules/deepsec/SKILL.md.
    • Read .deepsec/data/<id>/SETUP.md.
    • Replace .deepsec/data/<id>/INFO.md with concise project-specific context.
    • Keep INFO.md to roughly 50-100 lines.
    • Use 3-5 examples per section. Name local primitives such as auth helpers, middleware, database clients, webhook handlers, and privileged APIs.
    • Do not include line numbers, generic CWE lists, or broad framework summaries.
  5. Run the scan:
    • Run corepack pnpm deepsec scan from .deepsec/.
  6. Run bounded AI processing:
    • Default command: corepack pnpm deepsec process --limit 25 --concurrency 2 --batch-size 3.
    • If the candidate set is below the limit, state that all discovered candidates were processed.
    • If the user explicitly requested a full run, use the requested limit/concurrency or omit --limit.
    • If the process command fails, stop and report the failure. Do not generate a manual fallback report from regex candidates.
  7. Generate the findings report:
    • Run corepack pnpm deepsec export --format md-dir --out ./findings.
    • If there are no findings, create .deepsec/findings/README.md summarizing that this bounded pass found no findings and include the exact commands that were run.
  8. Summarize the run:
    • Include commands run, project id, limit/concurrency, and whether the report contains findings.
    • Do not include a "Next Steps - Full Scan" section by default.
    • Only include a follow-up scan section if DeepSec reports unprocessed candidates or the user explicitly asked about deeper coverage. Label it "Optional Deeper Follow-Up" and explain exactly how it differs from the completed run.

Read the full file on GitHub · 58 lines

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 · 58 lines · 41 tokens per session scan A d09b74a1ca27

Subscribe to this mod's changes

deepsec is a skill published in the GitHub repository vercel-labs/dev3000 (1,597 stars, last pushed 7d ago), licensed MIT. It adds 41 tokens to every session and 912 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

deepsec compared with skills from other repositories

deepsec next to 6 skills from other repositories
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deepsecvercel-labs/dev3000Skill1.6k7d agoMITA41Claude Code, Codex
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