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.
npx skills add axiomantic/spellbook --skill dehallucinationgit clone --depth 1 https://github.com/axiomantic/spellbookWrote 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/axiomantic/spellbook/dehallucination)<a href="https://agentmods.dev/skills/axiomantic/spellbook/dehallucination"><img src="https://agentmods.dev/badge/skills/axiomantic/spellbook/dehallucination/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/axiomantic/spellbook/dehallucination"><img src="https://agentmods.dev/badge/skills/axiomantic/spellbook/dehallucination.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 | $0.00089 | $0.01193 |
| Opus 5.5 | $0.00036 | $0.00477 |
| Sonnet 5.5 | $0.00018 | $0.00239 |
| Haiku 4.5 | $0.00009 | $0.00119 |
Grade A, and why
dehallucination 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dehallucination
Factual Verification Specialist. Adhere to the installed spellbook rule modules.
Before verification: artifact under review, context sources, specific concerns, verification scope.
After verification: claims assessed, confidence levels assigned, hallucinations flagged.
Invariant Principles
- Verify first: Always check Tier 1-5 sources before accepting a claim.
- Citation required: Every verdict must cite specific evidence.
- Trace spread: When a hallucination is found, check all dependent artifacts.
Inputs / Outputs
| Input | Required | Description |
|---|---|---|
artifact_path |
Yes | Path to artifact to verify |
context_sources |
No | Paths to context files for verification |
feedback |
No | Roundtable feedback indicating hallucination concerns |
| Output | Type | Description |
|---|---|---|
verification_report |
Inline | Claims and their status |
corrected_artifact |
File | Artifact with hallucinations corrected |
confidence_map |
Inline | Map of claims to confidence levels |
Hallucination Categories
| Category | Pattern | Detection |
|---|---|---|
| Fabricated References | Citing non-existent files, functions, APIs | Check if path/function/endpoint exists |
| Invented Capabilities | Asserting features that don't exist | Verify against actual library/framework API |
| False Constraints | Stating non-existent limitations | Check if constraint is documented |
| Phantom Dependencies | Assuming unavailable dependencies | Check requirements, config |
| Temporal Confusion | Mixing planned vs implemented | Check current codebase state |
Confidence Levels (Guidelines)
| Level | Evidence Required |
|---|---|
| VERIFIED | Direct evidence (file, code, docs) |
| HIGH | Multiple supporting signals |
| LOW | Limited or conflicting evidence |
| HALLUCINATION | Evidence contradicts 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.
- 1mo ago First seen · 115 lines · 89 tokens per session scan A 2e85e81892fe
dehallucination is a skill published in the GitHub repository axiomantic/spellbook (10 stars, last pushed 2d ago), licensed MIT. It adds 89 tokens to every session and 1,193 once invoked, about $0.0004 per session on Opus 5.5. 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.
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