Skills

blog-factcheck

blog-factcheck is a skill in AgriciDaniel/claude-blog, last changed 12 Oct 2026. It is instructions only: no scripts, no named hosts and no pre-approved tools. Our pattern check flagged nothing at commit 3544423 on 27 Oct 2026.

Pattern check: nothing flagged · commit 3544423 · 27 Oct 2026

Install
From the author
Verify statistics and claims in blog posts by fetching cited source URLs and checking if the claimed data actually appears on the page. Extracts all load-bearing claims (statistics, product or policy claims, ranking and comparative claims, named sources), validates cited URLs before fetching, and scores match confidence (exact match 1.0, paraphrase 0.7-0.9, not found 0.0). Flags uncited claims as UNVERIFIED and marks a claim verified only when this run fetched the source and found the passage. Checks that a source says what the post says it says; it cannot prove the source is true or verify first-hand experience. Use when the user says "fact check", "verify statistics", "check sources", "factcheck". Report only; not for rewriting posts (blog-rewrite).
Licence
MIT
Repo stars
2.6k
Folder last changed
12 Oct 2026 (opens in a new tab)
Publisher
AgriciDaniel
Files
1 file
Checked
3544423 (opens in a new tab) · 27 Oct 2026

Install

Each tab says whether it installs commit 3544423, the one we checked, or the latest version.

No tab for your agent? Use Any agent for OpenCode, Goose, Windsurf (Devin Desktop), Zed, Roo Code, Factory Droid, Junie, Amp and Antigravity, and Claude Code for Cline. Kiro needs the folder copied by hand.

Pinned to commit 3544423, the one we checked.

From your project's root folder:

tmp="$(mktemp -d)" &&
  git clone -q --depth 1 --filter=blob:none --no-checkout https://github.com/AgriciDaniel/claude-blog.git "$tmp" &&
  git -C "$tmp" fetch -q --depth 1 origin 354442348815a7f0327077ad89af2c43cf4b4ab4 &&
  git -C "$tmp" sparse-checkout set -- skills/blog-factcheck &&
  git -C "$tmp" checkout -q 354442348815a7f0327077ad89af2c43cf4b4ab4 &&
  mkdir -p .claude/skills &&
  mkdir .claude/skills/blog-factcheck &&
  cp -R "$tmp"/skills/blog-factcheck/. .claude/skills/blog-factcheck/ &&
  rm -rf "$tmp"

If Claude Code was already running and this created the skills folder, run /reload-skills.

Or install the claude-blog plugin it ships in. Installs the latest version, not the one we checked. Installs everything in the plugin, including any hooks, MCP servers and scripts our check doesn't cover.

claude plugin marketplace add AgriciDaniel/claude-blog --scope project &&
  claude plugin install claude-blog@agricidaniel-blog --scope project
Claude Code docs (opens in a new tab)

What it can touch

From the files and frontmatter at commit 3544423. This is how much a skill can do, not whether it is risky.

What it can touch: Instructions only

It is instructions only: no scripts, no named hosts and no pre-approved tools.

Pattern check

Pattern check: nothing flagged · commit 3544423 · 27 Oct 2026

We checked every text file in this skill, at commit 3544423 on 27 Oct 2026, against 45 published patterns such as download-and-run commands, hidden text and credential access. We don't run the skill, we don't read the web pages it points to, and we can't judge everything its instructions might lead an agent to do. In published tests, pattern checks like this one missed most malicious skills. Read the skill before you install it — especially anything it asks you to download or run.

How the check worksReport an incorrect finding

Format check

Each agent reads SKILL.md a little differently. We check the file against each one's published rules; we don't run the skill in any agent.

  • Agent Skills specPasses with warnings

    The open format from agentskills.io, held to what the strictest agents enforce, so one folder loads everywhere.

    • Warning

      Fields outside the spec: user-invocable (read by Claude Code and VS Code) and argument-hint (read by Claude Code and VS Code). Uploads to the Claude apps and API, and the spec's validator, reject the file; most agents ignore these fields. O1

      Fix: Delete them for a portable skill, or keep them if you only target the agents that read them.

  • Claude CodePasses
  • Claude apps & API uploadFails

    Uploading to claude.ai or the Claude API, or packaging with Anthropic's script, accepts only the six spec fields and stops on anything else.

    • Error

      Upload and packaging fail on fields outside the spec: user-invocable and argument-hint. O1

      Fix: Delete them, and keep your own data under metadata as text values.

    • Note

      The description is 761 characters. The claude.ai Help Center says 200 at most, though Anthropic's API docs and validator allow 1,024. D4

      Fix: If the claude.ai upload refuses it, trim the description to 200 characters.

  • OpenAI (Codex & API)Passes with warnings

    Codex finds SKILL.md by its exact name and needs a description; OpenAI's Skills API checks the frontmatter against the spec and caps uploads.

    • Warning

      Fields outside the spec: user-invocable and argument-hint. Codex ignores them; OpenAI doesn't say whether its upload accepts them. O1

      Fix: Delete them, or move your own data under metadata as text values.

  • VS Code & CopilotPasses

SKILL.md

Files

1 file

PathSize
SKILL.md (opens in a new tab)10.7 KB

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