diff --git a/lib/roast/cogs/agent/providers/claude/tool_use.rb b/lib/roast/cogs/agent/providers/claude/tool_use.rb
index ed6fad87..ff03d557 100644
--- a/lib/roast/cogs/agent/providers/claude/tool_use.rb
+++ b/lib/roast/cogs/agent/providers/claude/tool_use.rb
@@ -91,6 +91,25 @@ def format_read
               details ? "READ #{file_path} (#{details})" : "READ #{file_path}"
             end
 
+            # Formats a Glob tool-use line.
+            #
+            # Input fields:
+            #   :pattern (String) – glob pattern to match    [required]
+            #   :path    (String) – directory to search in   [optional]
+            #
+            # Output: "GLOB <pattern>", with " (in <path>)" appended when :path
+            # is present.
+            #
+            # Examples:
+            #   GLOB **/*.rb (in lib/roast)
+            #   GLOB **/*.rb
+            #
+            #: () -> String
+            def format_glob
+              pattern, path = input.values_at(:pattern, :path)
+              path ? "GLOB #{pattern} (in #{path})" : "GLOB #{pattern}"
+            end
+
             #: () -> String
             def format_unknown
               "UNKNOWN [#{name}] #{input.inspect}"
diff --git a/test/roast/cogs/agent/providers/claude/tool_use_test.rb b/test/roast/cogs/agent/providers/claude/tool_use_test.rb
index 6beff4aa..188982e6 100644
--- a/test/roast/cogs/agent/providers/claude/tool_use_test.rb
+++ b/test/roast/cogs/agent/providers/claude/tool_use_test.rb
@@ -103,6 +103,24 @@ class ToolUseTest < ActiveSupport::TestCase
               assert_equal "READ /a.rb", output
             end
 
+            # format_glob
+
+            test "format_glob renders the pattern only when no path given" do
+              tool_use = ToolUse.new(name: :glob, input: { pattern: "**/*.rb" })
+
+              output = tool_use.format
+
+              assert_equal "GLOB **/*.rb", output
+            end
+
+            test "format_glob appends the search path in parentheses" do
+              tool_use = ToolUse.new(name: :glob, input: { pattern: "**/*.rb", path: "lib/roast" })
+
+              output = tool_use.format
+
+              assert_equal "GLOB **/*.rb (in lib/roast)", output
+            end
+
             test "format calls format_unknown for unknown tool" do
               tool_use = ToolUse.new(name: :unknown_tool, input: { arg: "value" })