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How to cross-check a market claim against independent sources with Sandbase Skills

Run the multi-source-search Skill to test a claim against web and academic evidence.

Short answer: Run npx skills use sandbaseai/sandbase-skills@multi-source-search to generate the full Skill prompt, or run npx skills add sandbaseai/sandbase-skills@multi-source-search --agent codex to install it; then open your agent in a project folder that has web or search tools enabled; give the agent the claim to test and ask it to verify the strongest evidence for and against it. All steps.

  • Top pick
  • Research
  • Intermediate
  • 15 minutes
  • From the README
  • Codex
  • Claude Code
  • Cursor
  • Gemini CLI

Authorization notice. Sandbase Skills is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Who it is forA product manager or analyst who needs to check a market claim before using it in a plan or deck.

The problemSingle-source answers from an agent can hide disagreement and weak evidence.

The outcomeA cross-checked findings summary with disagreements called out, using your agent's existing search tools.

What you need first

  • An AI agent that supports Agent Skills, such as Codex, Claude Code, Cursor, Gemini CLI, or DeepSeek Harness
  • Node.js with npx for the skills CLI installs
  • GitHub CLI 2.90.0 or later for the gh skill workflow
  • Python 3 and a local clone of the repository to run the offline validator
  • A SANDBASE_API_KEY set in your environment only for specialized social, market, and data-provider Skills

Steps

  1. Run npx skills use sandbaseai/sandbase-skills@multi-source-search to generate the full Skill prompt, or run npx skills add sandbaseai/sandbase-skills@multi-source-search --agent codex to install it.
  2. Open your agent in a project folder that has web or search tools enabled.
  3. Give the agent the claim to test and ask it to verify the strongest evidence for and against it.
  4. Read the disagreements section and check the linked sources yourself before sharing any conclusion.

Prompt for your agent

Use the multi-source-search Skill from the sandbaseai/sandbase-skills repo to fact-check this claim with independent sources: <claim>. Return an evidence ledger with supporting and opposing sources, confidence per claim, and any conflicts. Verify that every source in the ledger is a link you actually read.

Caveat. The Skill works with your agent's existing search tools, and SandBase only adds broader provider coverage when you connect it.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for sandbaseai/sandbase-skills and "Cross-check a market claim against independent sources"

Add Deduped to Claude Code once

claude mcp add --transport http deduped https://dedupedai.com/mcp

Cursor, ChatGPT, others

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