add taskoutput tool result formatter backed by nokogiri

Gemfile.lock

@@ -4,6 +4,7 @@ PATH
     roast-ai (1.1.0)
       activesupport (~> 8.0)
       async (>= 2.34)
+      nokogiri (>= 1.18)
       rainbow (>= 3.0.0)
       ruby_llm (>= 1.13)
       type_toolkit (>= 0.0.5)
@@ -108,6 +109,10 @@ GEM
     net-http (0.9.1)
       uri (>= 0.11.1)
     netrc (0.11.0)
+    nokogiri (1.19.3-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.19.3-x86_64-linux-gnu)
+      racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)

lib/roast/cogs/agent/providers/claude/tool_result.rb

@@ -1,6 +1,8 @@
 # typed: true
 # frozen_string_literal: true
 
+require "nokogiri"
+
 module Roast
   module Cogs
     class Agent < Cog
@@ -251,6 +253,29 @@ def format_taskcreate
               ok_line(preview)
             end
 
+            # Formats a TaskOutput tool-result line.
+            #
+            # Content: sibling tags carrying the task's state, followed by a
+            # trailing <output> of arbitrary unescaped text. Parsed leniently
+            # as an XML fragment, which tolerates the absent single root and the
+            # unescaped <output> body.
+            #
+            # Output: "TASKOUTPUT OK <status>" – the text of <status>, or of
+            # <retrieval_status> when no <status> tag is present (as on a
+            # pending retrieval). The status is omitted when neither is present.
+            #
+            # Examples:
+            #   TASKOUTPUT OK completed
+            #   TASKOUTPUT OK pending
+            #   TASKOUTPUT OK
+            #
+            #: () -> String
+            def format_taskoutput
+              fragment = Nokogiri::XML::DocumentFragment.parse(content.to_s)
+              status = (fragment.at_xpath(".//status") || fragment.at_xpath(".//retrieval_status"))&.text&.strip
+              ok_line(status)
+            end
+
             #: () -> String
             def format_unknown
               "UNKNOWN [#{tool_name}] OK #{tool_use_description}\n#{content}"

roast-ai.gemspec

@@ -33,6 +33,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency("activesupport", "~> 8.0")
   spec.add_dependency("async", ">= 2.34")
+  spec.add_dependency("nokogiri", ">= 1.18")
   spec.add_dependency("rainbow", ">= 3.0.0")
   spec.add_dependency("ruby_llm", ">= 1.13")
   spec.add_dependency("type_toolkit", ">= 0.0.5")