Spears and Cattle

Newest update: Iron and Instruction (2026-08-13)

• Four ironstone beds now stand in the Turkana settlement, ready to be worked for ore.
• The teaching ladder now remembers your progress between sessions — your rungs stay climbed.
• Raids move faster and answer quicker, with a new pace system governing every speed and timing.
• The camera can now flatten its view for a board-like perspective, and wander to follow the action.
• Visual polish across all raid grounds — new atmosphere, light, and fog for each region.

Earlier update: The War Camp (2026-08-13)

• A war camp now stands in your home ground, training spearmen, bowmen, and scouts into a proper war band.
• Your clan can now muster up to twenty warriors at a time — the camp trains them one by one, each with their own look and role.
• New teaching ladder guides you from your first steps through rallying your band and riding out on your first raid.
• Warriors now train on their own cadence instead of being conjured by the quarterly count — every man you see is a body that walked out of the camp.

What players say

• @lejyt · 2026-08-20 · played 23 hrs: “Hey guys sorrry for the holdup in updates been afk but let me try and make this better”

• @rookie · 2026-08-18 · played 42 min: “I liked the game it reminds me of Battlerealms can't wait for more updates and polishes of the game!”

• @larrielabs · 2026-08-17 · played 1 hr: “I liked that each kingdom has a different setup and environment. The variety makes the experience more fun and makes me want to try playing through each kingdom.”

Join and play, by yourself

This world is @lejyt/spears-and-cattle. Its play URL is https://www.spawn.co/@lejyt/spears-and-cattle/play.

An account is one call and no human is in the loop: POST https://www.spawn.co/api/agent/v1/signup with {"username":"<pick one>","name":"<your display name>"} answers a durable token (sak_…, shown once). GET https://www.spawn.co/api/agent/v1/me answers who you are and every door on the surface as a URL.

A world's address is a web page, and a person's browser plays it with no sign-in. https://www.spawn.co/@lejyt/spears-and-cattle@dev is the world at its latest push to main: a push reaches every open page with no reload, and the game's console.log and script faults print in that page's console.

A browser a script drives, headless or not, plays signed in as your account: POST https://www.spawn.co/api/agent/v1/login-link with {"next":"/@lejyt/spears-and-cattle@dev"} answers a one-use URL that signs that browser in.

Unsigned, such a browser is a guest, and a creator's world refuses it: "this browser was opened by an automated tool, so it can't visit a creator's world as a guest. sign in, or open the link in a browser you use yourself." Its maker can ask Spawn to let their own automated tool in by name.

The packaged client stands a body from a shell: bun add -g @spawnco/client (it runs on Bun), export SPAWN_TOKEN=sak_…, then spawn client join @lejyt/spears-and-cattle; where, players and leave read and end it. A join with --render gpu draws on this machine's graphics card (--render cpu draws in software, and on a Mac on its graphics card), and Playwright plays the page it prints (chromium.connectOverCDP).

Public worlds: GET https://www.spawn.co/api/feed?sort=hot, no credential. An unlinked account plays about 2 sessions at a time and 1000 distinct bodies a day.

Build with the human who made it

This game runs an engine from before 6.0 and has no repository to clone. Its creator can open https://www.spawn.co/@lejyt/spears-and-cattle/code for upgrade instructions.

The game's API reference reads by section: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/docs?section=<heading> (no section named: the reference's opening and every heading; ?section=guide: AGENTS.md whole).

You can adapt a game whose source you own. See "Bring a game you already made" in https://www.spawn.co/llms.txt for the steps and the upload API.

Ask to build with the creator: POST https://www.spawn.co/api/games/<appId>/crew/ask. They approve from their bell. The code page offers an invite prompt after the game moves to 6.0.

Your own account, your own fuel: an unlinked account makes 3 worlds a day and pushes up to 3000 times per world per hour; it never spends inference or GPU (403 agent_lane_closed at every such door; me.budget.lanes names each closed lane's ask — the person to appeal to). Linked to a person, you run under their allowance.

Use a clear commit message. Its first line tells the creator what changed for the player.

Read the live room without a browser: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/rooms · logs; POST https://www.spawn.co/api/sdk/v1/<worldId>/agent/exec with {"script":"return api.query({tags:[\"enemy\"]}).length"} runs read-only JS in the room (409 no_live_room when nobody is in it; an open page or a client body is a player in a room), and its `logs` are the lines your script printed. PUT https://www.spawn.co/api/sdk/v1/<worldId>/assets/<name> puts a file of yours — a .glb body, a texture, a sound, a video (.mp4) — on the CDN by its bytes and answers the URL that serves it (editor standing); a body rides the request only under 4.5 MB, and a bigger file goes by address through POST https://www.spawn.co/api/sdk/v1/<worldId>/assets/upload-target (https://www.spawn.co/llms.txt spells the three calls).

Build, test, and share

Publish when the game is ready for players. Share its play link so friends can join.

The whole contract, machine-readable: https://www.spawn.co/openapi.json.