make-fire
について
このスキルは、摩擦・火花・太陽光を利用した発火技術と火の維持管理を可能にし、適地の選定、材料の選別、火床の構築手法を扱います。暖を取る、照明の確保、信号発信、湯沸かし、調理、緊急時の生存など、多様な用途に対応。開発者は、野外生存や原始的な火起こし能力を必要とするシナリオに統合できます。
クイックインストール
Claude Code
推奨npx skills add pjt222/agent-almanac -a claude-code/plugin add https://github.com/pjt222/agent-almanacgit clone https://github.com/pjt222/agent-almanac.git ~/.claude/skills/make-fireこのコマンドをClaude Codeにコピー&ペーストしてスキルをインストールします
ドキュメント
Make Fire
Start + maintain fire in wilderness w/ natural + carried materials.
Use When
- Need warmth, light, signal
- Boil water → purify (see
purify-water) - Cook foraged/hunted food (see
forage-plants) - Emergency → heat, morale
In
- Required: Ignition (ferro rod, flint+steel, lighter, bow drill, lens)
- Required: Dry tinder
- Optional: Site constraints (wind, ground, cover)
- Optional: Purpose (warmth, cooking, signal, purify)
Do
Step 1: Site
Safe, functional, low impact.
Site Selection Criteria:
┌─────────────────────┬────────────────────────────────────┐
│ Factor │ Requirement │
├─────────────────────┼────────────────────────────────────┤
│ Wind │ Sheltered or with a windbreak │
│ Ground │ Mineral soil, rock, or sand │
│ Overhead clearance │ No branches within 3 m / 10 ft │
│ Distance from water │ At least 5 m / 15 ft from streams │
│ Distance from camp │ Close enough for use, far enough │
│ │ to avoid spark hazards to gear │
│ Drainage │ Slight slope or flat; avoid hollows│
│ │ where rain pools │
└─────────────────────┴────────────────────────────────────┘
Clear 1 m / 3 ft circle → mineral soil. Snow/wet → platform of green logs or flat stones.
→ Cleared, level site, no debris in circle, clear overhead, wind-shielded.
If err: no ground → raised platform, 4-6 green wrist-thick logs side by side. Wind strong → windbreak from logs, rocks, or tarp at 45°.
Step 2: Gather + Grade
Three categories, graded by dryness + size.
Material Grading:
┌──────────┬──────────────────┬──────────────┬───────────────────────────┐
│ Category │ Diameter │ Examples │ Quantity needed │
├──────────┼──────────────────┼──────────────┼───────────────────────────┤
│ Tinder │ Hair-thin fibers │ Birch bark, │ Two fist-sized bundles │
│ │ │ dried grass, │ │
│ │ │ cedar bark, │ │
│ │ │ fatwood │ │
│ │ │ shavings, │ │
│ │ │ cattail fluff│ │
├──────────┼──────────────────┼──────────────┼───────────────────────────┤
│ Kindling │ Pencil-thin to │ Dead twigs, │ Two armfuls, sorted by │
│ │ finger-thick │ split sticks │ thickness │
├──────────┼──────────────────┼──────────────┼───────────────────────────┤
│ Fuel │ Wrist-thick to │ Dead standing│ Enough for intended burn │
│ │ arm-thick │ wood, split │ time (1 armload ≈ 1 hr) │
│ │ │ logs │ │
└──────────┴──────────────────┴──────────────┴───────────────────────────┘
Dryness Test:
- Snap test: dry wood snaps cleanly; damp wood bends
- Sound test: dry wood clicks when struck together; damp wood thuds
- Source priority: dead standing > dead leaning > dead on dry ground > dead on wet ground
→ Three sorted piles, arm's reach. Tinder bone-dry + fine. Kindling snaps clean.
If err: all damp → scrape inner bark (cedar, birch, poplar) → fine fibers. Fatwood ignites wet. Last resort → carried starters (cotton+petroleum jelly, wax cardboard).
Step 3: Build Lay
Choose lay → purpose + conditions.
Fire Lay Decision Table:
┌──────────────┬──────────────────────┬──────────────────────────┐
│ Fire Lay │ Best for │ Construction │
├──────────────┼──────────────────────┼──────────────────────────┤
│ Teepee │ Quick start, boiling │ Lean kindling against │
│ │ water, signaling │ a central tinder bundle │
│ │ │ in a cone shape │
├──────────────┼──────────────────────┼──────────────────────────┤
│ Log cabin │ Sustained heat, │ Stack pairs of sticks in │
│ │ cooking, drying │ alternating layers like │
│ │ │ a cabin; tinder in center│
├──────────────┼──────────────────────┼──────────────────────────┤
│ Lean-to │ Windy conditions │ Push a green stick into │
│ │ │ ground at 30°; lean │
│ │ │ kindling against it with │
│ │ │ tinder underneath │
├──────────────┼──────────────────────┼──────────────────────────┤
│ Platform │ Snow/wet ground │ Lay green logs side by │
│ │ │ side as a base; build │
│ │ │ teepee or log cabin on │
│ │ │ top │
├──────────────┼──────────────────────┼──────────────────────────┤
│ Star/Radial │ Long burns with │ Lay 4-5 logs radiating │
│ │ minimal fuel │ from center like spokes; │
│ │ │ push inward as they burn │
└──────────────┴──────────────────────┴──────────────────────────┘
Leave gaps → airflow. Fire needs O2 → pack loose, not tight.
→ Stable structure, tinder accessible, airflow gaps, kindling → flame climbs tinder → kindling → fuel.
If err: collapses → support stick driven in ground as post. Smokes won't flame → open gaps, wind side open at base.
Step 4: Ignite
Method → available tools.
Ignition Methods (ranked by reliability):
┌───────────────┬────────────────────────────────────────────────┐
│ Method │ Technique │
├───────────────┼────────────────────────────────────────────────┤
│ Lighter/match │ Apply flame directly to tinder for 5-10 sec │
├───────────────┼────────────────────────────────────────────────┤
│ Ferro rod │ Hold rod against tinder; scrape striker down │
│ │ rod at 45° with firm, fast strokes; direct │
│ │ sparks into center of tinder bundle │
├───────────────┼────────────────────────────────────────────────┤
│ Flint & steel │ Strike steel against flint edge to cast sparks │
│ │ onto char cloth laid on tinder │
├───────────────┼────────────────────────────────────────────────┤
│ Bow drill │ Carve fireboard notch; place tinder below; │
│ │ spin spindle with bow using steady, full-length│
│ │ strokes until coal forms in notch │
├───────────────┼────────────────────────────────────────────────┤
│ Solar (lens) │ Focus sunlight through lens onto dark tinder; │
│ │ hold steady until smoke appears; gently blow │
└───────────────┴────────────────────────────────────────────────┘
→ Tinder glows (ember) or small flame within 30 sec.
If err: sparks land, tinder won't catch → too damp or coarse. Process finer (scrape, shred, fluff). Ferro rod → add magnesium shavings as accelerant. Bow drill → spindle+fireboard same dry softwood (willow, cedar, poplar), notch reaches center.
Step 5: Nurture
Ember → flame carefully.
- Ember (bow drill, flint+steel) → fold bundle around, blow gently, steady increasing breaths → flame
- Flaming bundle → fire lay
- Shield wind w/ body or break
- Thinnest kindling first → pencil-thin sticks where flame touches
- Wait for catch before adding more
→ Flames climb tinder → smallest kindling in 1-2 min. Crackling → self-sustaining.
If err: dies at kindling → too thick or damp. Split thinner, use driest. Suffocates → lay too tight, lift material gently. No hard blow → scatters embers.
Step 6: Fuel Up
Progressive size increase.
- Kindling burns steady (2-3 min) → add finger-thick
- Catch fully → add wrist-thick
- Arrange fuel → maintain airflow: lean or cross-stack
- Cooking → burn down to coal bed (20-30 min) before pot/grill
Fuel Progression:
Tinder → Pencil-thin → Finger-thick → Wrist-thick → Arm-thick
(each stage must be established before adding the next)
→ Stable, self-sustaining fire, consistent heat, refuel every 15-30 min.
If err: dies when adding larger → jumping sizes. Back one size smaller, build bigger coal bed. Hisses/steams → too wet, split → expose dry inner, or prop near (not on) fire to dry.
Step 7: Extinguish + LNT
Extinguishing Protocol:
1. Stop adding fuel 30-60 min before you need the fire out
2. Let wood burn down to ash
3. Spread coals and ash with a stick
4. Douse with water (pour, stir, pour again)
5. Feel with the back of your hand 10 cm / 4 in above the ashes
6. If any warmth is felt, repeat douse-stir-douse
7. When cold to touch, scatter the ash over a wide area
8. Replace any ground cover or duff that was moved
9. "Could someone walk by and not know a fire was here?"
→ Site cold to touch, no visible coals, area undisturbed.
If err: no water → smother w/ mineral soil (not organic duff → smolders). Stir + check repeatedly. Never leave until cold. Coals in deep ash → scrape aside, douse exposed.
Check
- Site cleared → mineral soil or platform built
- Materials gathered in 3 graded categories before ignite
- Lay allowed airflow
- Tinder → kindling no die
- Fire reached self-sustaining fuel stage
- Fully extinguished → cold touch, no embers
- LNT site
Traps
- Damp tinder: Most common fail. Process finer than you think. Source dead standing.
- Smother w/ fuel: Too much wood too fast → cuts O2. Gradual build.
- Ignore wind: Helps or kills. Use for airflow, shield during ignite.
- Bad sort: Searching kindling while tinder burns → wastes time. Gather+sort before spark.
- Wet ground: Dry wood on wet ground → heat loss. Platform in damp.
- Incomplete extinguish: Buried coals reignite hours later. Always verify cold touch.
→
purify-water— boil needs sustained fire; boil method depends on thisforage-plants— many plants → tinder (birch, cattail, grass); some need cookingpaper-making— handcraft paper from fibres; shares fibre prep + pulping w/ tinder prep
GitHub リポジトリ
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