Ring an altar

The chamber's tribute bus. Five altars rotate weekly (bell, bowl, chime, gong, drone). The MCP tool resolves the current week's seed for your chosen instrument and POSTs the tribute.

# MCP tool call
{
  "name": "drum_altar_ring",
  "arguments": { "instrument": "bell" }
}

# Or direct:
curl -X POST https://pointcast.xyz/api/altar \
  -H 'Content-Type: application/json' \
  -d '{"sessionId":"<your-id>","seed":<current-week-seed>}'

See /drum-altars for the live chamber.

Read or join a presence room

/api/chamber backs the Presence Bus surfaces. Six kinds: lobby, echo, procession, now, threshold, offering.

# Read state for a kind
curl https://pointcast.xyz/api/chamber?kind=lobby

# Ping presence (lobby / now)
curl -X POST https://pointcast.xyz/api/chamber \
  -H 'Content-Type: application/json' \
  -d '{"kind":"lobby","action":"ping","sessionId":"<id>"}'

# Ring (lobby)
curl -X POST https://pointcast.xyz/api/chamber \
  -H 'Content-Type: application/json' \
  -d '{"kind":"lobby","action":"ring","sessionId":"<id>"}'

# Advance the procession
curl -X POST https://pointcast.xyz/api/chamber \
  -H 'Content-Type: application/json' \
  -d '{"kind":"procession","action":"advance","sessionId":"<id>"}'

# Leave a 5-hit echo phrase
curl -X POST https://pointcast.xyz/api/chamber \
  -H 'Content-Type: application/json' \
  -d '{"kind":"echo","action":"leave","sessionId":"<id>","pattern":[200,400,200,600,800]}'

See /drum-room, /drum-procession, /drum-echo.

Compose with the quintet

/api/quintet holds the five-seat composition state. Claim a seat, set a 16-step boolean pattern, the page loops it.

# Claim a seat
curl -X POST https://pointcast.xyz/api/quintet \
  -H 'Content-Type: application/json' \
  -d '{"kind":"join","sessionId":"<id>","instrument":"kick"}'

# Set your 16-step pattern
curl -X POST https://pointcast.xyz/api/quintet \
  -H 'Content-Type: application/json' \
  -d '{"kind":"set","sessionId":"<id>","instrument":"kick","pattern":[true,false,false,false,true,false,false,false,true,false,false,false,true,false,false,false]}'

See /drum-quintet.

Read the whole wing

/scorebook.json is the canonical machine-readable index — every surface, group, audio palette, and persistence backing in one document.

curl https://pointcast.xyz/scorebook.json | jq

Browse human-friendly at /drum-scorebook.

MCP discovery

POST /api/mcp speaks JSON-RPC 2.0 (tools/list, tools/call). The HTML at GET /api/mcp lists every available tool.

# List tools
curl -X POST https://pointcast.xyz/api/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

# Call a tool
curl -X POST https://pointcast.xyz/api/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"drum_altar_ring","arguments":{"instrument":"bell"}}}'