Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add KingGyuSuh/gemini-search-cc/plugin install geminiWrote 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.
[](https://agentmods.dev/skills/kinggyusuh/gemini-search-cc/fact-check)<a href="https://agentmods.dev/skills/kinggyusuh/gemini-search-cc/fact-check"><img src="https://agentmods.dev/badge/skills/kinggyusuh/gemini-search-cc/fact-check/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.
<a href="https://agentmods.dev/skills/kinggyusuh/gemini-search-cc/fact-check"><img src="https://agentmods.dev/badge/skills/kinggyusuh/gemini-search-cc/fact-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00016 | $0.00393 |
| Opus 5 | $0.00008 | $0.00197 |
| Sonnet 5 | $0.00003 | $0.00079 |
| Haiku 4.5 | $0.00002 | $0.00039 |
Grade A, and why
fact-check 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 11d 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.
What it actually says
Verify a technical claim, assumption, or statement using the Antigravity CLI's real-time grounded Google Search.
Use this when you encounter claims in code comments, documentation, Stack Overflow answers, or conversation that need verification against current, authoritative sources.
Raw slash-command arguments:
$ARGUMENTS
Steps
-
If
$ARGUMENTSis empty, useAskUserQuestionto ask what claim to verify. -
Run the companion script:
node "${CLAUDE_PLUGIN_ROOT}/scripts/gemini-companion.mjs" factcheck "$ARGUMENTS" -
If the command fails with a non-zero exit code:
- Run
node "${CLAUDE_PLUGIN_ROOT}/scripts/gemini-companion.mjs" setupto diagnose. - Show the diagnosis to the user and stop.
- Run
-
Return the command output verbatim to the user.
-
After the results, provide a Fact-Check Verdict:
- Verdict: Confirmed / Partially True / Misleading / False / Unverifiable
- Confidence: High / Medium / Low (based on source agreement)
- Key Correction: If the claim was wrong, state the correct information with source
Constraints
- Do not paraphrase the search output.
- Do not speculate beyond what the search results show.
- If sources disagree, present both sides and note the disagreement.
- Always cite the sources that support or refute the claim.
- If the claim cannot be verified through search, say so explicitly — do not guess.
- Distinguish between "no evidence found" and "evidence contradicts the claim."
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.
- 11d ago First seen · 42 lines · 16 tokens per session scan A 96647e6036c8
fact-check is a skill published in the GitHub repository KingGyuSuh/gemini-search-cc (3 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 16 tokens to every session and 393 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 2026-08-31.
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