spec-discovery

spec-discovery is a skill for Claude Code, Codex from NyxFoundation/speca. It costs 15 tokens per session (616 once invoked), scanned A, original, MIT.

A workflow for finding technical specification documents from a starting web address. It follows relevant links to locate specifications, whitepapers, and architecture documents.

In plain words
What is it for?
Use it to discover specifications and design documents under developer, technology, documentation, or whitepaper sections.
Why use it?
It reduces the time spent searching documentation sites manually and helps gather related technical sources from one starting point.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/nyxfoundation/speca/spec-discovery
Any agent
npx skills add NyxFoundation/speca --skill spec-discovery
Clone the repo
git clone --depth 1 https://github.com/NyxFoundation/speca

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 spec-discovery

README.md
[![agentmods](https://agentmods.dev/badge/skills/nyxfoundation/speca/spec-discovery.svg)](https://agentmods.dev/skills/nyxfoundation/speca/spec-discovery)
Your own site
<a href="https://agentmods.dev/skills/nyxfoundation/speca/spec-discovery"><img src="https://agentmods.dev/badge/skills/nyxfoundation/speca/spec-discovery.svg" alt="Measured on agentmods" height="20"></a>
Per session 15 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 616 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00015 $0.00616
Opus 5 $0.00008 $0.00308
Sonnet 5 $0.00003 $0.00123
Haiku 4.5 $0.00002 $0.00062

Measured 5d ago against content hash ee5609cf96dc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

spec-discovery 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 5d 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.

.claude/skills/spec-discovery/SKILL.md · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SKILL: Specification Discovery

Mindset

You are a meticulous Web Researcher tasked with finding all relevant technical specification documents starting from a seed URL. Your goal is to be comprehensive and follow all promising links.

Goal

Given a starting URL, navigate the website to find and list all URLs pointing to technical specifications, whitepapers, or architectural documents. These are often found in sections like "Developers", "Documentation", "Technology", or "Whitepaper".

Tools

  • Primary: mcp__fetch__fetch - Use for static documentation pages (returns Markdown, fast and efficient)
  • Fallback: Browser tools (browser_navigate, browser_scroll, browser_click, browser_view) - Use for dynamic/JavaScript-rendered pages or when mcp__fetch__fetch fails (403, timeout, JS-required)

Input

A JSON object containing the starting URL:

{
  "url": "https://example.com/project"
}

Procedure

  1. Initial Fetch: Use mcp__fetch__fetch with the provided url to retrieve the page content as Markdown.
  2. Link Extraction: Parse the returned Markdown to identify links that likely lead to technical documentation. Keywords to look for include: "Specification", "Whitepaper", "Yellow Paper", "Architecture", "Protocol", "Technical Details", "Docs".
  3. Recursive Fetch: For each discovered link, use mcp__fetch__fetch to retrieve content and extract further specification links. Limit depth to 2-3 levels.
  4. Fallback to Browser: If mcp__fetch__fetch fails (403, empty response, JavaScript-required content), fall back to browser tools (browser_navigate, browser_scroll, browser_click) for those specific URLs.
  5. Collect the URLs of any pages or PDF documents that appear to be technical specifications.
  6. Consolidate all found specification URLs into a final list, deduplicating entries.

Output Format

Return a JSON object containing a list of found specification URLs. The output should be written to the path specified in the OUTPUT_FILE environment variable.

Read the full file on GitHub · 65 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. 5d ago First seen · 65 lines · 15 tokens per session scan A ee5609cf96dc

Subscribe to this mod's changes

spec-discovery is a skill published in the GitHub repository NyxFoundation/speca (454 stars, last pushed 24d ago), licensed MIT. It adds 15 tokens to every session and 616 once invoked, about $0.0001 per session on Opus 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

Other skills, from other repositories

systematic-debugging

Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.

obra/superpowers · 21 tokens

local-ai-agents

Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…

microsoft/ai-agents-for-beginners · 200 tokens

next-cache-components-adoption

Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…

vercel/next.js · 95 tokens

chat-pet-sprite-creation

Use when creating or changing VS Code chat pet sprite art, sprite sheets, state animations, eye treatments, Stable/Insiders variants, or pet transitions under src/vs/workbench/contrib/chat/browser/widget/media/chatPet.

microsoft/vscode · 53 tokens

cpu-profile-analysis

Analyze V8/Chrome CPU profiles (.cpuprofile) and DevTools trace files (Trace-.json). Use when: profiling performance, investigating slow functions, comparing code paths, finding bottlenecks, analyzing timeToRequest, understanding call trees from sampling profiler data, analyzing layout/paint/rendering, investigating…

microsoft/vscode · 71 tokens

insight-error-page

Write or audit an insight-kind error page for the Next.js dev overlay. Use when creating a new errors/ .mdx page, auditing an existing one, or checking that a page matches the framework fix cards. Covers page structure, title alignment, FixCard cards with Copy prompt button, code snippets, terminology verification…

vercel/next.js · 83 tokens