verify-claims

verify-claims is a skill for Claude Code from pedrohcgs/claude-code-my-workflow. It costs 137 tokens per session (2,096 once invoked), scanned A, original, MIT.

A claim-checking tool that examines factual statements in a draft and reports whether each is supported, contradicted, or impossible to verify. It uses a separate verification pass that does not see the original draft.

In plain words
What is it for?
Use it to check claims in Markdown, Quarto, or LaTeX drafts, optionally against specified source files or URLs.
Why use it?
It helps reveal unsupported or inaccurate claims before they are published or sent for review.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: reads .claude/ paths.

Good fit Use it to check claims in Markdown, Quarto, or LaTeX drafts, optionally against specified source files or URLs.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/pedrohcgs/claude-code-my-workflow/verify-claims
About the project

claude-code-my-workflow is a forkable setup for using Claude Code to produce and review academic papers, slides, data analyses, and replication packages. Researchers use its agents, skills, rules, hooks, and quality checks to coordinate these tasks and verify their results. The catalogue entries define the reusable workflow components for Claude Code.

pedrohcgs/claude-code-my-workflow · 1,570 stars · on GitHub · psantanna.com

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.

Any agent
npx skills add pedrohcgs/claude-code-my-workflow --skill verify-claims
Clone the repo
git clone --depth 1 https://github.com/pedrohcgs/claude-code-my-workflow

Made for: Claude Code.

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 verify-claims

README.md
[![agentmods](https://agentmods.dev/badge/skills/pedrohcgs/claude-code-my-workflow/verify-claims/github.svg)](https://agentmods.dev/skills/pedrohcgs/claude-code-my-workflow/verify-claims)
Your own site
<a href="https://agentmods.dev/skills/pedrohcgs/claude-code-my-workflow/verify-claims"><img src="https://agentmods.dev/badge/skills/pedrohcgs/claude-code-my-workflow/verify-claims/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 verify-claims

Your own site · 80×15
<a href="https://agentmods.dev/skills/pedrohcgs/claude-code-my-workflow/verify-claims"><img src="https://agentmods.dev/badge/skills/pedrohcgs/claude-code-my-workflow/verify-claims.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 137 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,096 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 high

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 →

  • high Agent Snooping · line 81
    Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.
    Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
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 $0.00137 $0.02096
Opus 5 $0.00068 $0.01048
Sonnet 5 $0.00027 $0.00419
Haiku 4.5 $0.00014 $0.00210

Measured 6d ago against content hash 8f1cd669767a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

verify-claims 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 6d 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/verify-claims/SKILL.md · 142 lines

How it starts

The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/verify-claims — Chain-of-Verification on a Draft

Fact-check a draft using the Post-Flight Verification protocol (.claude/rules/post-flight-verification.md).

Input: $ARGUMENTS — path to a file containing the draft (markdown, .qmd, .tex, .md) or a shorthand pointer. Optional flags:

  • --source <path-or-url> — one or more source-material pointers (repeat for multiple). If omitted, the skill infers from context (e.g., papers referenced, cited arXiv URLs).
  • --no-fail-closed — downgrade FAIL outcomes to warnings without regeneration. Use sparingly.

When to pick this skill

  • /verify-claims (this skill) — ad-hoc fact-checking on any draft or text block the user hands you. One-shot, user-invoked.
  • Other skills that auto-run Post-Flight internally (/lit-review, /research-ideation, /respond-to-referees, /review-paper --peer) — no need to call this separately; they already run it.
  • /proofread — grammar, typos, overflow. Different lens.
  • /review-paper (default mode) — full manuscript review, not just claim verification.
  • /validate-bib — checks citations exist and are well-formed (structural + DOI). This skill checks they hold (the cited paper supports the attributed claim). Complementary — run both before submission.

How it works

Implements the 4-step CoVe loop from Dhuliawala et al. 2023 (arXiv:2309.11495), with architectural enforcement of the fresh-context independence trick.

Phase 0 — Pre-Flight

Confirm:

  • Draft file exists and is readable
  • At least one source pointer available (either --source or auto-detected from draft)
  • claim-verifier agent file exists at .claude/agents/claim-verifier.md

If any fail → surface the failure, do NOT proceed.

Phase 1 — Extract claims

Read the draft. Identify factual assertions of these types:

Type Example
Citation "Smith (2019, JEL) shows X"
Numerical fact "N = 10,000", "ATT = 0.42"
Negative literature "No prior work studies X"
Named entity researcher, paper title, venue, package, estimator name
Dataset claim "The CPS contains field educ_attain"

Read the full file on GitHub · 142 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 6d ago First seen · 142 lines · 137 tokens per session scan A 8f1cd669767a

Subscribe to this mod's changes

verify-claims is a skill published in the GitHub repository pedrohcgs/claude-code-my-workflow (1,570 stars, last pushed 16d ago), licensed MIT. It adds 137 tokens to every session and 2,096 once invoked, about $0.0007 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 2026-09-03.