diff --git a/data/scripts/o b/data/scripts/o
index 05916a1..c0e318c 100755
--- a/data/scripts/o
+++ b/data/scripts/o
@@ -7,9 +7,8 @@
 #   o <session>/<agent> <cmd>   Agent level
 #   o <session>:<agent> <cmd>   Agent level (colon separator)
 #
-# The slash or colon in session/agent disambiguates context level.
-# Use colon when session or agent names contain slashes.
-# Names with spaces can be quoted: o "my session:my agent" prompt
+# Slash is the primary separator. Agent names may contain colons.
+# Use colon separator only when session names contain slashes.
 #
 # Subcommands:
 #   read   <path>         Read a file (-l to loop)
@@ -485,9 +484,8 @@ Context is determined by the first argument:
   o <session>/<agent> <cmd>   Agent level
   o <session>:<agent> <cmd>   Agent level (colon separator)
 
-The slash or colon in session/agent disambiguates context level.
-Use colon when session or agent names contain slashes.
-Names with spaces can be quoted: o "my session:my agent" prompt
+Slash is the primary separator. Agent names may contain colons.
+Use colon separator only when session names contain slashes.
 
 Paths starting with / are root-relative (ignore context):
   o myproj ls /bypass         List root bypass/ even in session context
@@ -573,21 +571,23 @@ dispatch_cmd() {
 
 # Parse context from first argument
 # Supports:
-#   session/agent     (slash separator)
-#   session:agent     (colon separator)
+#   session/agent     (slash separator - primary)
+#   session:agent     (colon separator - for session names with slashes)
 #   "session name/agent"  (quoted with spaces)
-#   session\ name/agent   (escaped spaces)
+#
+# Slash is the primary separator. Use colon only when session names contain slashes.
+# Agent names may contain colons (e.g., "src:ollie").
 parse_context() {
     local arg="$1"
     
-    # Check for colon or slash separator
-    # Colon takes precedence if both present (allows session with / in name)
-    if [[ "$arg" == *:* ]]; then
-        CTX_SESSION="${arg%%:*}"
-        CTX_AGENT="${arg#*:}"
-    elif [[ "$arg" == */* ]]; then
+    # Slash is the primary separator
+    if [[ "$arg" == */* ]]; then
         CTX_SESSION="${arg%%/*}"
         CTX_AGENT="${arg#*/}"
+    elif [[ "$arg" == *:* ]]; then
+        # Colon separator (for session names containing slashes)
+        CTX_SESSION="${arg%%:*}"
+        CTX_AGENT="${arg#*:}"
     else
         # session only
         CTX_SESSION="$arg"