diff --git a/user/agents/mcp/servers b/user/agents/mcp/servers
index 693519a..c407948 100644
--- a/user/agents/mcp/servers
+++ b/user/agents/mcp/servers
@@ -37,3 +37,12 @@ penpot          http  https://penpot.gbrown.org/mcp/stream?userToken={TOKEN}  PE
 # is a launcher under user/agents/mcp/, and the token reaches it as MCP_TOKEN.
 # The hosted mcp.sentry.dev only speaks to sentry.io.
 sentry-gbrown   stdio  bin/sentry-gbrown  SENTRY_GBROWN_TOKEN
+
+# T3 Code environments, one per machine. Agents read projects and threads and,
+# with more than read-only access, start and message threads there. No token:
+# each is an OAuth server that asks for a pairing code from that machine on
+# first sign-in, and the grant lasts 30 days.
+t3-desktop      http  https://t3desktop.gbrown.org/mcp
+t3-mac          http  https://t3mac.gbrown.org/mcp
+t3-sr           http  https://t3sr.gbrown.org/mcp
+t3-jr           http  https://t3jr.gbrown.org/mcp