diff --git a/docs/implementation-status/os-backlog.md b/docs/implementation-status/os-backlog.md
index a641ed7..2cbdf14 100644
--- a/docs/implementation-status/os-backlog.md
+++ b/docs/implementation-status/os-backlog.md
@@ -111,8 +111,9 @@ column ownership).
 - **Cross-project filing (2026-07-13, issue #27, ADR-0034):** `Backlog::ProjectIndex` —
   derived global index at `~/.cc-os/projects.json` (atomic temp+rename writes, corrupt/
   missing → empty, `CC_OS_HOME` override), upserted fail-soft by config-write (canonical
-  path via `git rev-parse --show-toplevel`), queried via new `projects [filter]` CLI
-  subcommand. Discoverer template + tea/gh/card-add mechanics in
+  path = realpath of the directory the config was written into — NOT the git toplevel, so
+  umbrella subprojects index as themselves; corrected 2026-07-13 review), queried via new
+  `projects [filter]` CLI subcommand (filter matches name, tracker, or path). Discoverer template + tea/gh/card-add mechanics in
   `skills/route/references/cross-project-filing.md`; one CROSS-PROJECT rule line added to
   the SessionStart note. 9 new tests; suite 112 runs / 233 assertions / 0 failures. Live
   smoke: cc-os row present in the real index.
@@ -124,5 +125,15 @@ column ownership).
   cron installed; 6 tests; suite 128 runs / 0 failures. Follow-up recorded: single
   designated poller machine (state stays per-host); cadence/cron mechanism and a
   `config-write` wakeup key deferred until a first project opts in.
+- **Review corrections (2026-07-13, cards #1818330518584820864 / #1818330528525321347):**
+  post-ship review (Codex + verification pass) of the triage hook and project index:
+  `Config#planka_board` (`tracker=planka:<board>` now counts everywhere, incl. the
+  Resolver, not just the explicit `board` key); triage hook board resolution moved to pure
+  `TriageCheck.board_name_for` honoring the umbrella rule (session cwd's `.cc-os/config`
+  overrides the git root's; hook previously read only the root config); index keying fixed
+  per above; hook timeout 8→15s; `CC_OS_DEBUG=1` surfaces swallowed hook errors on stderr.
+  Known residual (captured as a Backlog card): board lookup is name-only across ALL Planka
+  projects — duplicate board names in different projects can resolve to the wrong board.
+  Suite 138 runs / 295 assertions / 0 failures.
 - **Outstanding:** #14 residual (onboard one more project — operational hitl); wakeup
   rollout (first opt-in project + poller machine + cadence).
diff --git a/plugins/os-backlog/bin/os-backlog b/plugins/os-backlog/bin/os-backlog
index 2674d0d..cc975d2 100755
--- a/plugins/os-backlog/bin/os-backlog
+++ b/plugins/os-backlog/bin/os-backlog
@@ -159,12 +159,13 @@ rescue StandardError
   [{ "tool" => "gh", "open_count" => nil, "reason" => "could not parse gh output" }, nil]
 end
 
-# Canonical repo path for the global project index: the git toplevel when
-# inside a work tree, else the realpath of cwd. Never raises.
+# Canonical path for the global project index: the realpath of cwd — the
+# directory config-write just wrote .cc-os/config into, i.e. the project
+# the row describes. Deliberately NOT the git toplevel: in an umbrella
+# repo a subdirectory's config is its own project, and keying on the
+# toplevel would make every subproject overwrite the umbrella's row.
+# Never raises.
 def canonical_repo_path
-  top = `git rev-parse --show-toplevel 2>/dev/null`.strip
-  return top unless top.empty?
-
   File.realpath(Dir.pwd)
 rescue StandardError
   Dir.pwd
@@ -299,7 +300,9 @@ when "projects"
   filter = rest.shift
   projects = Backlog::ProjectIndex.new.all
   if filter
-    projects = projects.select { |_path, row| row["name"].to_s.include?(filter) }
+    projects = projects.select do |path, row|
+      [row["name"], row["tracker"], path].any? { |field| field.to_s.include?(filter) }
+    end
   end
   puts JSON.pretty_generate({ "projects" => projects })
 when nil, "-h", "--help"
diff --git a/plugins/os-backlog/hooks/hooks.json b/plugins/os-backlog/hooks/hooks.json
index c92ebf1..91b32ed 100644
--- a/plugins/os-backlog/hooks/hooks.json
+++ b/plugins/os-backlog/hooks/hooks.json
@@ -12,7 +12,7 @@
           {
             "type": "command",
             "command": "ruby ${CLAUDE_PLUGIN_ROOT}/hooks/triage_check.rb",
-            "timeout": 8
+            "timeout": 15
           }
         ]
       }
diff --git a/plugins/os-backlog/hooks/triage_check.rb b/plugins/os-backlog/hooks/triage_check.rb
index 4ce69a0..3089470 100644
--- a/plugins/os-backlog/hooks/triage_check.rb
+++ b/plugins/os-backlog/hooks/triage_check.rb
@@ -39,18 +39,21 @@ def find_project_root(cwd)
   end
 end
 
-# Same board-name convention capture/route already use: an explicit
-# .cc-os/config `board` key, else — only inside a path the project
-# heuristic actually recognizes — the repo directory's own name. Outside
-# any known root with no explicit config, we don't guess (mirrors the
-# resolver's stop-and-discuss ambiguity gate).
+# Same config semantics as the CLI: the session cwd's own .cc-os/config
+# wins (umbrella subdir configs override the repo root's for sessions
+# started there), then the root config, then the path heuristic — and
+# `tracker=planka:<board>` counts, not just the explicit `board` key.
+# The decision itself is pure (TriageCheck.board_name_for); this only
+# reads the two candidate config files.
 def resolve_board_name(root)
-  config_path = File.join(root, ".cc-os", "config")
-  config = Backlog::Config.new(File.exist?(config_path) ? File.read(config_path) : nil)
-  return config.board if config.board
-  return nil unless Backlog::Resolver.project_for(root)
-
-  File.basename(root)
+  read = lambda do |dir|
+    path = File.join(dir, ".cc-os", "config")
+    File.exist?(path) ? File.read(path) : nil
+  end
+  cwd = File.expand_path(Dir.pwd)
+  Backlog::TriageCheck.board_name_for(cwd: cwd, root: root,
+                                      cwd_config: read.call(cwd),
+                                      root_config: read.call(root))
 end
 
 def build_client
@@ -86,6 +89,6 @@ end
 
 begin
   main
-rescue Exception # rubocop:disable Lint/RescueException  -- a hook must never block a session
-  nil
+rescue Exception => e # rubocop:disable Lint/RescueException  -- a hook must never block a session
+  warn "os-backlog triage_check: #{e.class}: #{e.message}" if ENV["CC_OS_DEBUG"]
 end
diff --git a/plugins/os-backlog/lib/backlog/config.rb b/plugins/os-backlog/lib/backlog/config.rb
index 0bb46e4..50f4cb3 100644
--- a/plugins/os-backlog/lib/backlog/config.rb
+++ b/plugins/os-backlog/lib/backlog/config.rb
@@ -35,6 +35,17 @@ module Backlog
       @data["tracker"]
     end
 
+    # @return [String, nil] the effective Planka board name: the explicit
+    #   `board` key when present, else the board named by a
+    #   `tracker=planka:<board>` key (the form config-write actually
+    #   writes). Non-planka trackers contribute nothing.
+    def planka_board
+      return board if board
+      return nil unless tracker&.start_with?("planka:")
+
+      tracker.delete_prefix("planka:")
+    end
+
     # @return [String, nil] the cached Planka board id, if present. Only a
     #   cache — the tracker's board *name* stays the source of truth
     #   (issue #22); BoardResolver decides whether to honor it.
diff --git a/plugins/os-backlog/lib/backlog/resolver.rb b/plugins/os-backlog/lib/backlog/resolver.rb
index 9f5bd0a..63deb5d 100644
--- a/plugins/os-backlog/lib/backlog/resolver.rb
+++ b/plugins/os-backlog/lib/backlog/resolver.rb
@@ -56,7 +56,8 @@ module Backlog
 
     # @return [Decision]
     def resolve
-      return decision_for_name(@config.board) || stop_and_discuss if @config.configured?
+      configured_board = @config.planka_board
+      return decision_for_name(configured_board) || stop_and_discuss if configured_board
 
       derived_decision || stop_and_discuss
     end
diff --git a/plugins/os-backlog/lib/backlog/triage_check.rb b/plugins/os-backlog/lib/backlog/triage_check.rb
index eb3aef4..131f0a2 100644
--- a/plugins/os-backlog/lib/backlog/triage_check.rb
+++ b/plugins/os-backlog/lib/backlog/triage_check.rb
@@ -14,6 +14,29 @@ module Backlog
     PRIORITY_LABELS = %w[P0 P1 P2 P3].freeze
     AUTONOMY_LABELS = %w[hitl semi afk-ready].freeze
 
+    # Which board should this session's triage check inspect? Mirrors the
+    # CLI's config semantics (the session cwd's own .cc-os/config wins —
+    # umbrella subdir configs override the repo root's), falling back to
+    # the root config, then to the path heuristic. Honors both the
+    # explicit `board` key and `tracker=planka:<board>` (via
+    # Config#planka_board). Pure: the hook script reads the files and
+    # passes contents (or nil) in.
+    #
+    # @param cwd [String] the session's working directory
+    # @param root [String] the enclosing git toplevel (== cwd outside umbrellas)
+    # @param cwd_config [String, nil] contents of <cwd>/.cc-os/config
+    # @param root_config [String, nil] contents of <root>/.cc-os/config
+    # @return [String, nil] board name, or nil (don't guess) when nothing
+    #   is configured and the path heuristic doesn't recognize the path
+    def self.board_name_for(cwd:, root:, cwd_config:, root_config:)
+      config_home = cwd_config ? cwd : root
+      config = Config.new(cwd_config || root_config)
+      return config.planka_board if config.planka_board
+      return nil unless Resolver.project_for(config_home)
+
+      File.basename(config_home)
+    end
+
     # @param labels [Array<String>] the label names on one card
     # @return [Boolean]
     def self.needs_triage?(labels)
diff --git a/plugins/os-backlog/tests/config_test.rb b/plugins/os-backlog/tests/config_test.rb
index 2b84056..3d1b6c6 100644
--- a/plugins/os-backlog/tests/config_test.rb
+++ b/plugins/os-backlog/tests/config_test.rb
@@ -122,4 +122,19 @@ class ConfigTest < Minitest::Test
   def test_set_on_nil_contents
     assert_equal "board_id=42\n", Backlog::Config.set(nil, "board_id", "42")
   end
+
+  def test_planka_board_prefers_explicit_board_key
+    config = Backlog::Config.new("board=explicit\ntracker=planka:from-tracker\n")
+    assert_equal "explicit", config.planka_board
+  end
+
+  def test_planka_board_derives_from_planka_tracker
+    config = Backlog::Config.new("tracker=planka:my-board\n")
+    assert_equal "my-board", config.planka_board
+  end
+
+  def test_planka_board_nil_for_non_planka_tracker
+    assert_nil Backlog::Config.new("tracker=forgejo:me/repo\n").planka_board
+    assert_nil Backlog::Config.new(nil).planka_board
+  end
 end
diff --git a/plugins/os-backlog/tests/project_index_test.rb b/plugins/os-backlog/tests/project_index_test.rb
index 62699c8..4aab83c 100644
--- a/plugins/os-backlog/tests/project_index_test.rb
+++ b/plugins/os-backlog/tests/project_index_test.rb
@@ -102,6 +102,30 @@ class ProjectsCliContractTest < Minitest::Test
 
         filtered = Dir.chdir(repo) { `#{env} ruby #{BIN} projects no-such-name 2>/dev/null` }
         assert_equal({}, JSON.parse(filtered)["projects"])
+
+        by_tracker = Dir.chdir(repo) { `#{env} ruby #{BIN} projects planka:demo 2>/dev/null` }
+        assert_equal 1, JSON.parse(by_tracker)["projects"].size
+      end
+    end
+  end
+
+  # Umbrella repos: config-write from a subdirectory writes the config to
+  # that subdirectory, so the index row must be keyed by the SUBDIRECTORY
+  # (the project the config describes), never the enclosing git toplevel —
+  # otherwise every subproject masquerades as the umbrella repo.
+  def test_config_write_in_umbrella_subdir_indexes_the_subdir
+    Dir.mktmpdir do |home|
+      Dir.mktmpdir do |repo|
+        `git -C #{repo} init -q 2>/dev/null`
+        subdir = File.join(repo, "child-project")
+        FileUtils.mkdir_p(subdir)
+        env = "CC_OS_HOME=#{home} HOME=#{home}"
+
+        Dir.chdir(subdir) { `#{env} ruby #{BIN} config-write planka:child 2>/dev/null` }
+
+        projects = Dir.chdir(subdir) { JSON.parse(`#{env} ruby #{BIN} projects 2>/dev/null`)["projects"] }
+        assert_equal [File.realpath(subdir)], projects.keys
+        assert_equal "child-project", projects.values.first["name"]
       end
     end
   end
diff --git a/plugins/os-backlog/tests/resolver_test.rb b/plugins/os-backlog/tests/resolver_test.rb
index b26ff59..a635da2 100644
--- a/plugins/os-backlog/tests/resolver_test.rb
+++ b/plugins/os-backlog/tests/resolver_test.rb
@@ -101,6 +101,16 @@ class ResolverTest < Minitest::Test
     assert_equal "use proxmox-ubuntu", resolver.resolve_string
   end
 
+  def test_planka_tracker_key_resolves_to_its_board
+    resolver = Backlog::Resolver.new(
+      repo_path: "/somewhere/unrecognized/repo",
+      config_contents: "tracker=planka:my-board\n",
+      boards: %w[my-board]
+    )
+
+    assert_equal "use my-board", resolver.resolve_string
+  end
+
   def test_project_for_returns_dev_clients_servers_or_nil
     assert_equal "Dev", Backlog::Resolver.project_for("/home/jared/dev/some-repo")
     assert_equal "Clients", Backlog::Resolver.project_for("/home/jared/clients/acme-co")
diff --git a/plugins/os-backlog/tests/triage_check_test.rb b/plugins/os-backlog/tests/triage_check_test.rb
index 583909d..10c6edd 100644
--- a/plugins/os-backlog/tests/triage_check_test.rb
+++ b/plugins/os-backlog/tests/triage_check_test.rb
@@ -38,4 +38,49 @@ class TriageCheckTest < Minitest::Test
     assert_includes note, "1 unlabeled Backlog card on board cc-os"
     refute_includes note, "1 unlabeled Backlog cards"
   end
+
+  def test_board_name_for_subdir_config_overrides_root_config
+    name = Backlog::TriageCheck.board_name_for(
+      cwd: "/home/jared/servers/proxmox", root: "/home/jared/servers",
+      cwd_config: "tracker=planka:proxmox-board\n", root_config: "board=servers\n"
+    )
+
+    assert_equal "proxmox-board", name
+  end
+
+  def test_board_name_for_falls_back_to_root_config
+    name = Backlog::TriageCheck.board_name_for(
+      cwd: "/home/jared/dev/cc-os/plugins", root: "/home/jared/dev/cc-os",
+      cwd_config: nil, root_config: "tracker=planka:cc-os\n"
+    )
+
+    assert_equal "cc-os", name
+  end
+
+  def test_board_name_for_subdir_config_without_board_names_the_subdir
+    name = Backlog::TriageCheck.board_name_for(
+      cwd: "/home/jared/servers/proxmox", root: "/home/jared/servers",
+      cwd_config: "version=3\n", root_config: nil
+    )
+
+    assert_equal "proxmox", name
+  end
+
+  def test_board_name_for_no_config_uses_heuristic_repo_basename
+    name = Backlog::TriageCheck.board_name_for(
+      cwd: "/home/jared/dev/cc-os", root: "/home/jared/dev/cc-os",
+      cwd_config: nil, root_config: nil
+    )
+
+    assert_equal "cc-os", name
+  end
+
+  def test_board_name_for_unrecognized_path_without_config_is_nil
+    name = Backlog::TriageCheck.board_name_for(
+      cwd: "/home/jared/scratch/x", root: "/home/jared/scratch/x",
+      cwd_config: nil, root_config: nil
+    )
+
+    assert_nil name
+  end
 end