historical-accuracy

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• SKILL.md
• routing.yaml · evals/
• historical-accuracy.skill

SKILL.md (first lines)

# historical-accuracy

## Core Philosophy
Historical accuracy in narrative fiction, biographical writing, period drama, and documentary prose is not simply avoiding smartphones in Victorian London. Deep historical authenticity requires microscopic vigilance across four distinct layers: linguistic etymology, material culture (food preservation, illumination, textiles, hygiene), institutional/class social norms, and historiographical perspective. A single anachronistic idiom or misplaced physical object instantly shatters the reader's suspension of disbelief.

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## 4-Step Historical Accuracy & Anachronism Audit

### Step 1: Linguistic & Etymological Verification
1. **The Oxford English Dictionary (OED) Timeline Test**:
   - Check the earliest recorded usage date of key words, metaphors, and idioms.
   - Example Anachronisms:
     - *"Brainwash"* (First coined in 1950 during the Korean War; cannot appear in 1920s prose).
     - *"Hold down the fort"* (Coined in 1864 Civil War; cannot appear in Elizabethan dialogue).
     - *"Freudian slip"*, *"paranoid"*, *"priority"* (did not exist as a plural until mid-20th century).
2. **Register & Cadence**:
   - Ensure syntax reflects the period's social hierarchy, religious conventions, and rhetorical patterns without descending into unreadable pastiche ("thee/thou" overload).

### Step 2: Material Culture & Technological Authenticity
1. **Everyday Life Constraints**:
   - *Illumination*: Tallow vs beeswax candles, whale oil lamps, gaslight, incandescent bulbs. Night was dark, smoky, and smelled of animal fat before electricity.
   - *Transit & Distance*: A 20-mile carriage journey on dirt roads took an entire day, ruined axles, and required horse changes.
   - *Textiles & Garments*: Fasteners (buttons were luxury items; pins and laces dominated before 1800; zippers did not exist until 1913).
   - *Medicine & Germ Theory*: Prior to Lister and Pasteur (1860s), surgeons operated in blood-encrusted coats without washing hands; infections were attributed to "bad air" (miasma).

### Step 3: Social Hierarchy & Institutional Realities
1. **Legal & Social Status**:
   - Property rights of married women (*coverture* in common law prevented women from owning property or signing contracts independently until late 19th-century Married Women's Property Acts).
   - Class segregation, religious restrictions, master-servant statutory laws, and racial codes.

### Step 4: Primary vs Secondary Historiographical Triangulation
1. **Primary Source Auditing**:
   - Check contemporary diaries, letters, trial transcripts, probate inventories, and newspapers (e.g. Pepys, Evelyn, London Gazette).
   - Avoid "anachronistic moralizing": Do not project 21st-century psychological assumptions or secular liberal values onto 14th-century medieval peasants.

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## Deliverable Format: Historical Accuracy Audit Report (`HISTORICAL-AUDIT.md`)

```markdown
# Historical Accuracy & Anachronism Audit: [Manuscript Title]
*Target Period: [e.g. London, November 1845 (Early Victorian)] | Auditor: Historical Researcher*

## 1. Executive Period Summary
- **Socio-Political Backdrop**: The Irish Potato Famine begins; Corn Laws repeal debates raging in Parliament.
- **Daily Technology Baseline**: Gas lighting in wealthy streets; candles/oil lamps in homes; early steam rail travel emerging; telegraph nascent.

## 2. Identified Anachronisms & Corrections
| Page / Scene | Identified Element | Why It Is Anachronistic | Recommended Historical Replacement |
|---|---|---|---|
| Ch 2, p. 18 | Character says: "She's so paranoid." | Word "paranoid" coined in 1890s psychiatry | Change to: *"She is dreadfully suspicious / harboring delusions."* |
| Ch 4, p. 45 | Character matches a cigarette with a paper book of matches | Matchbooks patented in 1892; lucifer friction matches used | Character strikes a wooden lucifer friction match on a tin box |
| Ch 7, p. 82 | Female character signs a bank loan independently | Coverture legally barred married women from independent banking | Must be signed by husband or male trustee |

## 3. Material Culture & Sensory Checklist
- [x] Smells: Coal smoke, horse manure, river Thames sewage (pre-Great Stink of 1858).
- [x] Lighting: Gaslight casts flickering yellow-green shadows; indoor rooms dim at night.
- [x] Currency: Correct denominations used (shillings, pence, sovereigns, guineas).
```

---

## Worked Example: 18th-Century Naval Historical Audit

- **Audit Finding**: Manuscript had a British Royal Navy sailor in 1775 wearing a blue standardized uniform.
- **Correction**: Official naval ratings had no uniform regulations until 1857; sailors wore civilian slops (checkered shirts, red waistcoats, wide trousers).
- **Result**: Rewrote visual description, increasing authentic period flavor and passing historical review.

---

## Verification Checklist

- [ ] Dialogue idioms checked against OED historical first-usage dates.
- [ ] Material technologies (lighting, heating, transit, fasteners) align with exact year.
- [ ] Social, gender, and legal constraints reflect authentic period statutes (e.g. coverture).
- [ ] Sensory details (smells, lighting levels, sounds) reflect the physical reality of the era.
- [ ] Primary source documents (diaries, letters, newspapers) cited as historical proof.

---

## Anti-Patterns

- **Hollywood Anachronisms**: Characters having flawless white teeth, indoor plumbing, and modern egalitarian social values in ancient Rome.
- **Lazy Slang**: Characters using modern idioms ("no problem", "I hear you", "get over it") in 19th-century dialogue.
- **Historiographical Projection**: Judging historical actors exclusively by modern moral standards without understanding contemporary period mentalities.

From poorvith-mp/skills-writing, MIT.

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