design-npc SKILL.md skillA
design-npc from summerengine/summer is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add summerengine/summer/design-npc@git:20261010.4ade947Pins git:20261010.4ade947 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- summerengine/summer
- Path
library/skills/design-npc/SKILL.md- Versions recorded
- 4
- Latest version
- git:20261010.4ade947, committed Oct 10, 2026
- First version recorded
- Sep 1, 2026
- Size
- 25,778 bytes
- Repository stars
- 86
- License
- MIT
Design enemy/NPC/boss/companion behavior — perception, personality, intent, action state machine, telegraphs — outputs a GDScript stub plus node tree.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# /design-npc — Design an NPC's Behavior End-to-End ## Overview A good NPC is legible and *alive*. The player can read its mood, predict its next move, and feel the consequence of theirs — and the four enemies in a patrol squad don't all behave like clones of one designer-authored script. This skill walks the canonical NPC AI pattern from the inside out: what the NPC perceives, what it *wants* (intent), what it *does* (action), what tells signal each state, and how it dies. **Core principle:** behavior is what the player *sees*. Two layers separate doing from wanting: an action state machine the body runs, and an intent layer above it that reads perception + personality and tells the action SM what to aim at. **Second principle:** identical NPCs are predictable, and predictable is boring. Every spawned instance jitters its personality knobs so a squad of four grunts produces emergent variety with zero designer authoring. ## Steps ### 1. Pick the NPC archetype Open with the question. Wait. > What's the NPC for? Pick the closest: > - **Basic enemy** (melee/ranged grunt, dies in 1–3 hits) > - **Boss** (named, scripted phases, 30–120 sec fight) …
Read the whole file at its exact version.
How to install
mdr add summerengine/summer/design-npc@sha256:9616771a22bb6e6fThe line at the top of this page pins the label git:20261010.4ade947, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_rofzefv7lyrt6dq6)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Sep 1, 2026 and Oct 10, 2026, about one every 13 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261010.4ade947 latest | 2026-10-10 | 4ade947 | 25,778 B | A | view · diff |
| git:20260911.b4df358 | 2026-09-11 | b4df358 | 26,294 B | A | view · diff |
| git:20260903.8014feb | 2026-09-03 | 8014feb | 26,544 B | A | view · diff |
| git:20260901.0837e7a | 2026-09-01 | 0837e7a | 26,191 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (25778 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
summerengine/summer · 86 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rofzefv7lyrt6dq6 GET https://markdownregistry.com/api/v1/resolve?ref=summerengine/summer/design-npc GET https://markdownregistry.com/api/v1/blob/9616771a22bb6e6f1765e37a65989496b2b9b0f97b5a229f34ef6cd6ddc821a8
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.