feat(session): allow session ID as direction in navigate_session_tree

lua/opencode/commands/handlers/session.lua

@@ -180,18 +180,38 @@ local function compute_target_index(current_idx, total, direction, wrap)
 end
 
 function M.actions.navigate_session_tree(direction, interaction, wrap, empty_policy)
+  if direction and not tree_directions[direction] and direction ~= 'forward' and direction ~= 'backward' then
+    empty_policy = empty_policy or 'notify'
+    if not state.active_session then
+      if empty_policy == 'notify' then
+        vim.notify('No active session to navigate from', vim.log.levels.WARN)
+      end
+      return
+    end
+    if interaction == 'picker' then
+      return session_runtime.select_session(direction)
+    end
+    return session_runtime.switch_session(direction)
+  end
+
   local active = state.active_session
   if not active then
-    if empty_policy == 'notify' then vim.notify('No active session', vim.log.levels.WARN) end
+    if empty_policy == 'notify' then
+      vim.notify('No active session', vim.log.levels.WARN)
+    end
     return
   end
 
   local dir = tree_directions[direction]
   if dir then
     local target_id = dir.get_target(active)
     if not target_id then
-      if direction == 'sibling' then return session_runtime.select_session(nil) end
-      if empty_policy == 'notify' then vim.notify('No ' .. direction, vim.log.levels.INFO) end
+      if direction == 'sibling' then
+        return session_runtime.select_session(nil)
+      end
+      if empty_policy == 'notify' then
+        vim.notify('No ' .. direction, vim.log.levels.INFO)
+      end
       return
     end
     if interaction == 'picker' or not dir.allow_direct then
@@ -204,13 +224,17 @@ function M.actions.navigate_session_tree(direction, interaction, wrap, empty_pol
   return Promise.async(function()
     local all_sessions = session_store.get_all_workspace_sessions():await()
     if not all_sessions or #all_sessions == 0 then
-      if empty_policy == 'notify' then vim.notify('No sessions', vim.log.levels.INFO) end
+      if empty_policy == 'notify' then
+        vim.notify('No sessions', vim.log.levels.INFO)
+      end
       return
     end
 
     local current_idx = find_session_index(all_sessions, active.id)
     if not current_idx then
-      if empty_policy == 'notify' then vim.notify('Session not in list', vim.log.levels.INFO) end
+      if empty_policy == 'notify' then
+        vim.notify('Session not in list', vim.log.levels.INFO)
+      end
       return
     end
 
@@ -576,8 +600,11 @@ M.command_defs = {
     end,
   },
   navigate_session_tree = {
-    desc = 'Navigate session tree (parent/child/sibling/forward/backward)',
+    desc = 'Navigate session tree (parent/child/sibling/forward/backward) or switch to a session by ID',
     execute = function(args)
+      if args[1] and not NAV_DIRECTIONS[args[1]] then
+        return M.actions.navigate_session_tree(args[1], args[2], args[3], args[4])
+      end
       local direction, interaction, wrap, empty_policy = normalize_navigate_args(args[1], args[2], args[3], args[4])
       return M.actions.navigate_session_tree(direction, interaction, wrap, empty_policy)
     end,

lua/opencode/ui/formatter/tools/task.lua

@@ -77,14 +77,16 @@ function M.format(output, part, get_child_parts)
   end
 
   local end_line = output:get_line_count()
-  output:add_action({
-    text = '[S]elect Child Session',
-    type = 'navigate_session_tree',
-    args = { 'child', 'picker' },
-    key = 'S',
-    display_line = start_line,
-    range = { from = start_line + 1, to = end_line + 1 },
-  })
+  if metadata.sessionId then
+    output:add_action({
+      text = '[S] Open this Session',
+      type = 'navigate_session_tree',
+      args = { metadata.sessionId },
+      key = 'S',
+      display_line = start_line,
+      range = { from = start_line + 1, to = end_line + 1 },
+    })
+  end
 end
 
 ---@param _ OpencodeMessagePart

tests/data/explore.expected.json

@@ -1188,10 +1188,10 @@
   ],
   "actions": [
     {
-      "args": ["child", "picker"],
+      "args": ["ses_341f3e676ffez6WUF6zpok7dUZ"],
       "display_line": 9,
       "type": "navigate_session_tree",
-      "text": "[S]elect Child Session",
+      "text": "[S] Open this Session",
       "range": { "from": 10, "to": 79 },
       "key": "S"
     }

tests/unit/commands_handlers_spec.lua

@@ -517,11 +517,15 @@ describe('opencode.commands.handlers', function()
   end)
 
   -- normalize_navigate_args tests via command_defs
-  it('normalize_navigate_args rejects invalid direction', function()
+  it('non-direction string is treated as session ID, notifies when no active session', function()
     local session_handler = require('opencode.commands.handlers.session')
-    local ok, err = pcall(session_handler.command_defs.navigate_session_tree.execute, { 'up' })
-    assert.is_false(ok)
-    assert.equal('invalid_arguments', err.code)
+    local state = require('opencode.state')
+    local notify_stub = stub(vim, 'notify')
+    state.session.clear_active()
+    local ok = pcall(session_handler.command_defs.navigate_session_tree.execute, { 'up' })
+    assert.is_true(ok)
+    assert.stub(notify_stub).was_called()
+    notify_stub:revert()
   end)
 
   it('normalize_navigate_args rejects invalid interaction', function()

tests/unit/formatter_spec.lua

@@ -585,9 +585,9 @@ describe('formatter', function()
     end)
 
     assert.are.same({
-      text = '[S]elect Child Session',
+      text = '[S] Open this Session',
       type = 'navigate_session_tree',
-      args = { 'child', 'picker' },
+      args = { 'ses_child' },
       key = 'S',
       display_line = 1,
       range = { from = 2, to = 5 },