Created src/prompt_constants.py (550+ lines) porting all constants from npm src/constants/:

┌──────────────────┬───────────────────────────┬───────────────────────────────────────────────┐
│ Category         │ npm Source                │ Items                                         │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Product metadata │ product.ts                │ URLs, base URLs                               │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ System prefixes  │ system.ts                 │ 3 prompt prefixes                             │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Cyber risk       │ cyberRiskInstruction.ts   │ Safety instruction                            │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ API limits       │ apiLimits.ts              │ 10 image/PDF/media limits                     │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Tool limits      │ toolLimits.ts             │ 6 result size constants                       │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Spinner verbs    │ spinnerVerbs.ts           │ 187 whimsical gerunds                         │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Completion verbs │ turnCompletionVerbs.ts    │ 8 past-tense verbs                            │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Figures/symbols  │ figures.ts                │ 25 Unicode UI symbols                         │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ XML tags         │ xml.ts                    │ 30+ tag constants                             │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Messages         │ messages.ts               │ NO_CONTENT_MESSAGE                            │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Date utilities   │ common.ts                 │ 4 functions                                   │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Section caching  │ systemPromptSections.ts   │ Memoized/volatile sections                    │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Output styles    │ outputStyles.ts           │ 3 built-in configs                            │
├──────────────────┼───────────────────────────┼───────────────────────────────────────────────┤
│ Prompt helpers   │ prompts.ts                │ Knowledge cutoff, language, scratchpad, hooks │
└──────────────────┴───────────────────────────┴───────────────────────────────────────────────┘

91 new tests in tests/test_prompt_constants.py. All 17 SQL todos done.

tests/test_prompt_constants.py

@@ -0,0 +1,643 @@
+"""Tests for prompt_constants module.
+
+Validates that all constants ported from npm src/constants/ are present,
+correctly typed, and that helper functions behave as expected.
+"""
+
+from __future__ import annotations
+
+import os
+import platform
+from unittest.mock import patch
+
+import pytest
+
+from src.prompt_constants import (
+    # Product metadata
+    PRODUCT_URL,
+    CLAUDE_AI_BASE_URL,
+    # System prompt prefixes
+    DEFAULT_SYSPROMPT_PREFIX,
+    AGENT_SDK_CLAUDE_CODE_PRESET_PREFIX,
+    AGENT_SDK_PREFIX,
+    CLI_SYSPROMPT_PREFIXES,
+    # Cyber risk
+    CYBER_RISK_INSTRUCTION,
+    # API limits
+    API_IMAGE_MAX_BASE64_SIZE,
+    IMAGE_TARGET_RAW_SIZE,
+    IMAGE_MAX_WIDTH,
+    IMAGE_MAX_HEIGHT,
+    PDF_TARGET_RAW_SIZE,
+    API_PDF_MAX_PAGES,
+    PDF_EXTRACT_SIZE_THRESHOLD,
+    PDF_MAX_EXTRACT_SIZE,
+    PDF_MAX_PAGES_PER_READ,
+    PDF_AT_MENTION_INLINE_THRESHOLD,
+    API_MAX_MEDIA_PER_REQUEST,
+    # Tool limits
+    DEFAULT_MAX_RESULT_SIZE_CHARS,
+    MAX_TOOL_RESULT_TOKENS,
+    BYTES_PER_TOKEN,
+    MAX_TOOL_RESULT_BYTES,
+    MAX_TOOL_RESULTS_PER_MESSAGE_CHARS,
+    TOOL_SUMMARY_MAX_LENGTH,
+    # Spinner verbs
+    SPINNER_VERBS,
+    # Turn completion verbs
+    TURN_COMPLETION_VERBS,
+    # Figures
+    BLACK_CIRCLE,
+    BULLET_OPERATOR,
+    TEARDROP_ASTERISK,
+    UP_ARROW,
+    DOWN_ARROW,
+    LIGHTNING_BOLT,
+    EFFORT_LOW,
+    EFFORT_MEDIUM,
+    EFFORT_HIGH,
+    EFFORT_MAX,
+    PLAY_ICON,
+    PAUSE_ICON,
+    REFRESH_ARROW,
+    CHANNEL_ARROW,
+    INJECTED_ARROW,
+    FORK_GLYPH,
+    DIAMOND_OPEN,
+    DIAMOND_FILLED,
+    REFERENCE_MARK,
+    FLAG_ICON,
+    BLOCKQUOTE_BAR,
+    HEAVY_HORIZONTAL,
+    BRIDGE_SPINNER_FRAMES,
+    BRIDGE_READY_INDICATOR,
+    BRIDGE_FAILED_INDICATOR,
+    # XML tags
+    COMMAND_NAME_TAG,
+    COMMAND_MESSAGE_TAG,
+    COMMAND_ARGS_TAG,
+    BASH_INPUT_TAG,
+    BASH_STDOUT_TAG,
+    BASH_STDERR_TAG,
+    LOCAL_COMMAND_STDOUT_TAG,
+    LOCAL_COMMAND_STDERR_TAG,
+    LOCAL_COMMAND_CAVEAT_TAG,
+    TERMINAL_OUTPUT_TAGS,
+    TICK_TAG,
+    TASK_NOTIFICATION_TAG,
+    TASK_ID_TAG,
+    TOOL_USE_ID_TAG,
+    TASK_TYPE_TAG,
+    OUTPUT_FILE_TAG,
+    STATUS_TAG,
+    SUMMARY_TAG,
+    REASON_TAG,
+    WORKTREE_TAG,
+    WORKTREE_PATH_TAG,
+    WORKTREE_BRANCH_TAG,
+    ULTRAPLAN_TAG,
+    REMOTE_REVIEW_TAG,
+    REMOTE_REVIEW_PROGRESS_TAG,
+    TEAMMATE_MESSAGE_TAG,
+    CHANNEL_MESSAGE_TAG,
+    CHANNEL_TAG,
+    CROSS_SESSION_MESSAGE_TAG,
+    FORK_BOILERPLATE_TAG,
+    FORK_DIRECTIVE_PREFIX,
+    COMMON_HELP_ARGS,
+    COMMON_INFO_ARGS,
+    # Messages
+    NO_CONTENT_MESSAGE,
+    # Date utilities
+    get_local_iso_date,
+    get_session_start_date,
+    reset_session_start_date,
+    get_local_month_year,
+    # System prompt section caching
+    SystemPromptSection,
+    system_prompt_section,
+    dangerous_uncached_system_prompt_section,
+    resolve_system_prompt_sections,
+    clear_system_prompt_sections,
+    # Output styles
+    DEFAULT_OUTPUT_STYLE_NAME,
+    OutputStyleConfig,
+    OUTPUT_STYLE_CONFIGS,
+    # Knowledge cutoff
+    FRONTIER_MODEL_NAME,
+    get_knowledge_cutoff,
+    CLAUDE_MODEL_IDS,
+    # Prompt sections
+    HOOKS_SECTION,
+    SYSTEM_REMINDERS_SECTION,
+    SUMMARIZE_TOOL_RESULTS_SECTION,
+    DEFAULT_AGENT_PROMPT,
+    SYSTEM_PROMPT_DYNAMIC_BOUNDARY,
+    get_language_section,
+    get_output_style_section,
+    get_scratchpad_instructions,
+    # Error IDs
+    E_TOOL_USE_SUMMARY_GENERATION_FAILED,
+)
+
+
+# =========================================================================
+# Product metadata
+# =========================================================================
+
+class TestProductMetadata:
+    def test_product_url(self):
+        assert PRODUCT_URL == "https://claude.com/claude-code"
+
+    def test_claude_ai_base_url(self):
+        assert CLAUDE_AI_BASE_URL == "https://claude.ai"
+
+
+# =========================================================================
+# System prompt prefixes
+# =========================================================================
+
+class TestSystemPromptPrefixes:
+    def test_default_prefix_content(self):
+        assert "Claude Code" in DEFAULT_SYSPROMPT_PREFIX
+        assert "Anthropic" in DEFAULT_SYSPROMPT_PREFIX
+
+    def test_agent_sdk_prefix_content(self):
+        assert "Agent SDK" in AGENT_SDK_PREFIX
+
+    def test_cli_sysprompt_prefixes_is_frozenset(self):
+        assert isinstance(CLI_SYSPROMPT_PREFIXES, frozenset)
+        assert len(CLI_SYSPROMPT_PREFIXES) == 3
+
+    def test_all_prefixes_in_set(self):
+        assert DEFAULT_SYSPROMPT_PREFIX in CLI_SYSPROMPT_PREFIXES
+        assert AGENT_SDK_CLAUDE_CODE_PRESET_PREFIX in CLI_SYSPROMPT_PREFIXES
+        assert AGENT_SDK_PREFIX in CLI_SYSPROMPT_PREFIXES
+
+
+# =========================================================================
+# Cyber risk
+# =========================================================================
+
+class TestCyberRisk:
+    def test_instruction_mentions_ctf(self):
+        assert "CTF" in CYBER_RISK_INSTRUCTION
+
+    def test_instruction_mentions_dos(self):
+        assert "DoS" in CYBER_RISK_INSTRUCTION
+
+
+# =========================================================================
+# API limits
+# =========================================================================
+
+class TestAPILimits:
+    def test_image_base64_size(self):
+        assert API_IMAGE_MAX_BASE64_SIZE == 5 * 1024 * 1024
+
+    def test_image_target_raw_size(self):
+        assert IMAGE_TARGET_RAW_SIZE == (API_IMAGE_MAX_BASE64_SIZE * 3) // 4
+
+    def test_image_dimensions(self):
+        assert IMAGE_MAX_WIDTH == 2000
+        assert IMAGE_MAX_HEIGHT == 2000
+
+    def test_pdf_target_raw_size(self):
+        assert PDF_TARGET_RAW_SIZE == 20 * 1024 * 1024
+
+    def test_pdf_max_pages(self):
+        assert API_PDF_MAX_PAGES == 100
+
+    def test_pdf_extract_threshold(self):
+        assert PDF_EXTRACT_SIZE_THRESHOLD == 3 * 1024 * 1024
+
+    def test_pdf_max_extract_size(self):
+        assert PDF_MAX_EXTRACT_SIZE == 100 * 1024 * 1024
+
+    def test_pdf_pages_per_read(self):
+        assert PDF_MAX_PAGES_PER_READ == 20
+
+    def test_pdf_inline_threshold(self):
+        assert PDF_AT_MENTION_INLINE_THRESHOLD == 10
+
+    def test_media_per_request(self):
+        assert API_MAX_MEDIA_PER_REQUEST == 100
+
+
+# =========================================================================
+# Tool limits
+# =========================================================================
+
+class TestToolLimits:
+    def test_default_max_result_size(self):
+        assert DEFAULT_MAX_RESULT_SIZE_CHARS == 50_000
+
+    def test_max_tool_result_tokens(self):
+        assert MAX_TOOL_RESULT_TOKENS == 100_000
+
+    def test_bytes_per_token(self):
+        assert BYTES_PER_TOKEN == 4
+
+    def test_max_tool_result_bytes_derived(self):
+        assert MAX_TOOL_RESULT_BYTES == MAX_TOOL_RESULT_TOKENS * BYTES_PER_TOKEN
+        assert MAX_TOOL_RESULT_BYTES == 400_000
+
+    def test_max_per_message_chars(self):
+        assert MAX_TOOL_RESULTS_PER_MESSAGE_CHARS == 200_000
+
+    def test_tool_summary_max_length(self):
+        assert TOOL_SUMMARY_MAX_LENGTH == 50
+
+
+# =========================================================================
+# Spinner verbs
+# =========================================================================
+
+class TestSpinnerVerbs:
+    def test_is_tuple(self):
+        assert isinstance(SPINNER_VERBS, tuple)
+
+    def test_count(self):
+        assert len(SPINNER_VERBS) == 187
+
+    def test_first_verb(self):
+        assert SPINNER_VERBS[0] == "Accomplishing"
+
+    def test_last_verb(self):
+        assert SPINNER_VERBS[-1] == "Zigzagging"
+
+    def test_all_strings(self):
+        for verb in SPINNER_VERBS:
+            assert isinstance(verb, str)
+
+    def test_contains_clauding(self):
+        assert "Clauding" in SPINNER_VERBS
+
+    def test_contains_thinking(self):
+        assert "Thinking" in SPINNER_VERBS
+
+    def test_no_duplicates(self):
+        assert len(SPINNER_VERBS) == len(set(SPINNER_VERBS))
+
+
+# =========================================================================
+# Turn completion verbs
+# =========================================================================
+
+class TestTurnCompletionVerbs:
+    def test_is_tuple(self):
+        assert isinstance(TURN_COMPLETION_VERBS, tuple)
+
+    def test_count(self):
+        assert len(TURN_COMPLETION_VERBS) == 8
+
+    def test_contains_worked(self):
+        assert "Worked" in TURN_COMPLETION_VERBS
+
+    def test_contains_baked(self):
+        assert "Baked" in TURN_COMPLETION_VERBS
+
+    def test_all_past_tense(self):
+        # All end in 'd' (past tense)
+        for verb in TURN_COMPLETION_VERBS:
+            assert verb[-1] == "d", f"{verb} doesn't end with 'd'"
+
+
+# =========================================================================
+# Figures / UI symbols
+# =========================================================================
+
+class TestFigures:
+    def test_black_circle_is_string(self):
+        assert isinstance(BLACK_CIRCLE, str)
+        assert len(BLACK_CIRCLE) == 1
+
+    def test_effort_symbols_are_distinct(self):
+        symbols = {EFFORT_LOW, EFFORT_MEDIUM, EFFORT_HIGH, EFFORT_MAX}
+        assert len(symbols) == 4
+
+    def test_arrows(self):
+        assert UP_ARROW == "\u2191"
+        assert DOWN_ARROW == "\u2193"
+
+    def test_bridge_spinner_frames(self):
+        assert isinstance(BRIDGE_SPINNER_FRAMES, tuple)
+        assert len(BRIDGE_SPINNER_FRAMES) == 4
+
+    def test_play_pause_icons(self):
+        assert PLAY_ICON == "\u25b6"
+        assert PAUSE_ICON == "\u23f8"
+
+    def test_diamond_symbols(self):
+        assert DIAMOND_OPEN == "\u25c7"
+        assert DIAMOND_FILLED == "\u25c6"
+
+
+# =========================================================================
+# XML tag constants
+# =========================================================================
+
+class TestXMLTags:
+    def test_command_tags(self):
+        assert COMMAND_NAME_TAG == "command-name"
+        assert COMMAND_MESSAGE_TAG == "command-message"
+        assert COMMAND_ARGS_TAG == "command-args"
+
+    def test_bash_tags(self):
+        assert BASH_INPUT_TAG == "bash-input"
+        assert BASH_STDOUT_TAG == "bash-stdout"
+        assert BASH_STDERR_TAG == "bash-stderr"
+
+    def test_terminal_output_tags_tuple(self):
+        assert isinstance(TERMINAL_OUTPUT_TAGS, tuple)
+        assert len(TERMINAL_OUTPUT_TAGS) == 6
+        assert BASH_INPUT_TAG in TERMINAL_OUTPUT_TAGS
+        assert LOCAL_COMMAND_STDOUT_TAG in TERMINAL_OUTPUT_TAGS
+
+    def test_tick_tag(self):
+        assert TICK_TAG == "tick"
+
+    def test_task_tags(self):
+        assert TASK_NOTIFICATION_TAG == "task-notification"
+        assert TASK_ID_TAG == "task-id"
+        assert TOOL_USE_ID_TAG == "tool-use-id"
+
+    def test_worktree_tags(self):
+        assert WORKTREE_TAG == "worktree"
+        assert WORKTREE_PATH_TAG == "worktreePath"
+
+    def test_fork_tags(self):
+        assert FORK_BOILERPLATE_TAG == "fork-boilerplate"
+        assert FORK_DIRECTIVE_PREFIX == "Your directive: "
+
+    def test_common_help_args(self):
+        assert isinstance(COMMON_HELP_ARGS, tuple)
+        assert "help" in COMMON_HELP_ARGS
+        assert "-h" in COMMON_HELP_ARGS
+        assert "--help" in COMMON_HELP_ARGS
+
+    def test_common_info_args(self):
+        assert isinstance(COMMON_INFO_ARGS, tuple)
+        assert "list" in COMMON_INFO_ARGS
+        assert "status" in COMMON_INFO_ARGS
+        assert "?" in COMMON_INFO_ARGS
+
+
+# =========================================================================
+# Message constants
+# =========================================================================
+
+class TestMessages:
+    def test_no_content_message(self):
+        assert NO_CONTENT_MESSAGE == "(no content)"
+
+
+# =========================================================================
+# Date utilities
+# =========================================================================
+
+class TestDateUtilities:
+    def test_get_local_iso_date_format(self):
+        d = get_local_iso_date()
+        parts = d.split("-")
+        assert len(parts) == 3
+        assert len(parts[0]) == 4  # year
+        assert len(parts[1]) == 2  # month
+        assert len(parts[2]) == 2  # day
+
+    def test_get_local_iso_date_override(self):
+        with patch.dict(os.environ, {"CLAUDE_CODE_OVERRIDE_DATE": "2025-01-15"}):
+            assert get_local_iso_date() == "2025-01-15"
+
+    def test_get_session_start_date_memoised(self):
+        reset_session_start_date()
+        d1 = get_session_start_date()
+        d2 = get_session_start_date()
+        assert d1 == d2
+
+    def test_reset_session_start_date(self):
+        reset_session_start_date()
+        d = get_session_start_date()
+        assert isinstance(d, str)
+        reset_session_start_date()
+        # After reset, should still return valid date
+        d2 = get_session_start_date()
+        assert isinstance(d2, str)
+
+    def test_get_local_month_year_format(self):
+        result = get_local_month_year()
+        parts = result.split()
+        assert len(parts) == 2
+        assert parts[1].isdigit()
+        assert len(parts[1]) == 4
+
+    def test_get_local_month_year_override(self):
+        with patch.dict(os.environ, {"CLAUDE_CODE_OVERRIDE_DATE": "2026-02-15"}):
+            assert get_local_month_year() == "February 2026"
+
+
+# =========================================================================
+# System prompt section caching
+# =========================================================================
+
+class TestSystemPromptSections:
+    def setup_method(self):
+        clear_system_prompt_sections()
+
+    def test_system_prompt_section_creates_cached(self):
+        s = system_prompt_section("test", lambda: "hello")
+        assert s.name == "test"
+        assert s.cache_break is False
+
+    def test_dangerous_uncached_creates_volatile(self):
+        s = dangerous_uncached_system_prompt_section("test", lambda: "hello", "reason")
+        assert s.name == "test"
+        assert s.cache_break is True
+
+    def test_resolve_caches_sections(self):
+        call_count = 0
+
+        def compute():
+            nonlocal call_count
+            call_count += 1
+            return f"value-{call_count}"
+
+        sections = [system_prompt_section("s1", compute)]
+        r1 = resolve_system_prompt_sections(sections)
+        r2 = resolve_system_prompt_sections(sections)
+        assert r1 == ["value-1"]
+        assert r2 == ["value-1"]  # cached
+        assert call_count == 1
+
+    def test_uncached_recomputes(self):
+        call_count = 0
+
+        def compute():
+            nonlocal call_count
+            call_count += 1
+            return f"value-{call_count}"
+
+        sections = [dangerous_uncached_system_prompt_section("s2", compute, "test")]
+        r1 = resolve_system_prompt_sections(sections)
+        r2 = resolve_system_prompt_sections(sections)
+        assert r1 == ["value-1"]
+        assert r2 == ["value-2"]  # recomputed
+        assert call_count == 2
+
+    def test_clear_resets_cache(self):
+        call_count = 0
+
+        def compute():
+            nonlocal call_count
+            call_count += 1
+            return f"value-{call_count}"
+
+        sections = [system_prompt_section("s3", compute)]
+        resolve_system_prompt_sections(sections)
+        clear_system_prompt_sections()
+        r = resolve_system_prompt_sections(sections)
+        assert r == ["value-2"]
+        assert call_count == 2
+
+    def test_resolve_handles_none(self):
+        sections = [system_prompt_section("nil", lambda: None)]
+        r = resolve_system_prompt_sections(sections)
+        assert r == [None]
+
+    def test_multiple_sections(self):
+        sections = [
+            system_prompt_section("a", lambda: "alpha"),
+            system_prompt_section("b", lambda: "beta"),
+            system_prompt_section("c", lambda: None),
+        ]
+        r = resolve_system_prompt_sections(sections)
+        assert r == ["alpha", "beta", None]
+
+
+# =========================================================================
+# Output styles
+# =========================================================================
+
+class TestOutputStyles:
+    def test_default_style_name(self):
+        assert DEFAULT_OUTPUT_STYLE_NAME == "default"
+
+    def test_default_style_is_none(self):
+        assert OUTPUT_STYLE_CONFIGS[DEFAULT_OUTPUT_STYLE_NAME] is None
+
+    def test_explanatory_exists(self):
+        style = OUTPUT_STYLE_CONFIGS["Explanatory"]
+        assert style is not None
+        assert style.name == "Explanatory"
+        assert "explains" in style.description
+
+    def test_learning_exists(self):
+        style = OUTPUT_STYLE_CONFIGS["Learning"]
+        assert style is not None
+        assert style.name == "Learning"
+        assert "hands-on" in style.description
+
+    def test_output_style_config_frozen(self):
+        style = OutputStyleConfig(
+            name="Test", description="desc", prompt="prompt"
+        )
+        with pytest.raises(Exception):
+            style.name = "other"  # type: ignore[misc]
+
+
+# =========================================================================
+# Knowledge cutoff
+# =========================================================================
+
+class TestKnowledgeCutoff:
+    def test_frontier_model_name(self):
+        assert FRONTIER_MODEL_NAME == "Claude Opus 4.6"
+
+    def test_opus_46_cutoff(self):
+        assert get_knowledge_cutoff("claude-opus-4-6-20250601") == "May 2025"
+
+    def test_sonnet_46_cutoff(self):
+        assert get_knowledge_cutoff("claude-sonnet-4-6-20250801") == "August 2025"
+
+    def test_opus_45_cutoff(self):
+        assert get_knowledge_cutoff("claude-opus-4-5-20250601") == "May 2025"
+
+    def test_haiku_cutoff(self):
+        assert get_knowledge_cutoff("claude-haiku-4-20250201") == "February 2025"
+
+    def test_sonnet_4_cutoff(self):
+        assert get_knowledge_cutoff("claude-sonnet-4-20250114") == "January 2025"
+
+    def test_unknown_model_returns_none(self):
+        assert get_knowledge_cutoff("gpt-4-turbo") is None
+
+    def test_claude_model_ids(self):
+        assert "opus" in CLAUDE_MODEL_IDS
+        assert "sonnet" in CLAUDE_MODEL_IDS
+        assert "haiku" in CLAUDE_MODEL_IDS
+
+
+# =========================================================================
+# Prompt section helpers
+# =========================================================================
+
+class TestPromptSectionHelpers:
+    def test_hooks_section_content(self):
+        assert "hooks" in HOOKS_SECTION
+        assert "user-prompt-submit-hook" in HOOKS_SECTION
+
+    def test_system_reminders_section(self):
+        assert "system-reminder" in SYSTEM_REMINDERS_SECTION
+
+    def test_summarize_tool_results(self):
+        assert "tool results" in SUMMARIZE_TOOL_RESULTS_SECTION
+
+    def test_default_agent_prompt(self):
+        assert "agent for Claude Code" in DEFAULT_AGENT_PROMPT
+
+    def test_dynamic_boundary(self):
+        assert SYSTEM_PROMPT_DYNAMIC_BOUNDARY == "__SYSTEM_PROMPT_DYNAMIC_BOUNDARY__"
+
+    def test_language_section_none_when_no_preference(self):
+        assert get_language_section(None) is None
+        assert get_language_section("") is None
+
+    def test_language_section_with_preference(self):
+        result = get_language_section("Spanish")
+        assert result is not None
+        assert "Spanish" in result
+        assert "# Language" in result
+
+    def test_output_style_section_none_when_no_config(self):
+        assert get_output_style_section(None) is None
+
+    def test_output_style_section_with_config(self):
+        config = OutputStyleConfig(
+            name="TestStyle",
+            description="A test style",
+            prompt="Be concise.",
+        )
+        result = get_output_style_section(config)
+        assert result is not None
+        assert "# Output Style: TestStyle" in result
+        assert "Be concise." in result
+
+    def test_scratchpad_none_when_no_dir(self):
+        assert get_scratchpad_instructions(None) is None
+        assert get_scratchpad_instructions("") is None
+
+    def test_scratchpad_with_dir(self):
+        result = get_scratchpad_instructions("/tmp/session-123")
+        assert result is not None
+        assert "/tmp/session-123" in result
+        assert "# Scratchpad Directory" in result
+        assert "temporary files" in result
+
+
+# =========================================================================
+# Error IDs
+# =========================================================================
+
+class TestErrorIDs:
+    def test_tool_use_summary_error(self):
+        assert E_TOOL_USE_SUMMARY_GENERATION_FAILED == 344