Claude Code v2.0.59

What: A complete task tracking system with four new tools for managing work items during coding sessions.

Tools added:

• TaskCreate - Create a new task with subject and description
• TaskGet - Retrieve a task by ID with full details
• TaskUpdate - Update task properties (subject, description, status, owner, comments, references, blockers)
• TaskList - List all tasks with their current status

How to use: Tasks are automatically created and managed by Claude during complex multi-step work. Each task has:

• Subject and description
• Status: open or resolved
• Optional owner assignment
• Comments with author attribution
• Reference links between tasks
• Blocking/blocked-by relationships

Details:

• Tasks are stored in .claude/tasks/ directory at tI2() function, line 344419
• Tasks persist across sessions within the same project
• Supports bidirectional task linking via $Y1() function at line 485071
• Evidence: TaskCreate tool at line 484977, TaskList at line 485460

What: A new messaging system allowing Claude agents to send and receive messages between teammates in multi-agent scenarios.

How it works:

• Mailbox stored at .claude/mailbox (BH5 variable at line 344469)
• Messages formatted as <teammate-message teammate_id="..."> (line 344461)
• Supports read/unread tracking with AY2() function at line 344440
• Messages delivered as attachments of type teammate_mailbox (line 345180)

Details:

• vH5() function at line 345163 checks for unread messages
• QY2() function at line 344459 formats messages for delivery
• eI2() function at line 344437 filters for unread messages only
• Evidence: New in v2.0.59 - no matches found in v2.0.58

What: After memory compaction events, users can optionally provide feedback on the compaction quality.

Details:

• Survey message: "How did that compaction go? (optional)" at line 481872
• Analytics event: tengu_post_compact_survey_event at line 477154
• Survey appears after compaction operations complete
• Auto-hides after 3 seconds (oj3 = 3000 at line 477153)
• Implemented via V39() hook at line 477101
• Evidence: Feature completely absent in v2.0.58

What: New architecture allowing main thread agents to provide custom system prompts.

Details:

• New mainThreadAgentDefinition parameter added to main UI component at line 480951
• HJ9() helper function at line 480920 handles system prompt resolution
• Conditionally calls agent's getSystemPrompt() method with tool context
• Enables more flexible agent customization
• Evidence: 7 occurrences in v2.0.59, zero in v2.0.58

What: Thinking mode now supports claude-opus-4-5 model via feature flag.

How it changed:

• Previous: Only claude-sonnet-4-5 had thinking enabled by default
• Now: claude-opus-4-5 can enable thinking via tengu_deep_ocean_current feature flag

Details:

• VrA() function at line 221003-221012 updated with new model check
• Feature flag check: BZ("tengu_deep_ocean_current", "on_by_default", !1) at line 221011
• Evidence: No deep_ocean_current in v2.0.58, added in v2.0.59

What: Plugin marketplace downloads now support custom HTTP headers for authentication.

Details:

• c22() function at line 306362 now accepts headers parameter
• Headers are logged (redacted) for debugging: O85() function at line 306357
• Enables private/authenticated marketplace support
• Evidence: Modified function structure shows headers parameter added

What: New analytics event buffering and sink attachment system.

Details:

• Hz0() function at line 2490 attaches analytics sink
• GA() function at line 2505 for synchronous events
• eu() function at line 2512 for async events
• Events buffered in NFA array until sink attached
• Prevents event loss during initialization

What: Feedback surveys now track the survey type (session vs post-compact).

Details:

• W39() function at line 476966 adds survey_type parameter to analytics
• Distinguishes between regular session feedback and post-compaction feedback
• Enables better analytics segmentation

What: The command to migrate from global npm installation to local installation has been removed.

Previous behavior:

• claude migrate-installer would move installation to ~/.claude/local
• Set up shell aliases automatically
• Removed global npm package

Details:

• Command definition removed (was at line 495151 in v2.0.58)
• All 10+ references to migrate-installer removed
• Forced migration flow (PU9() function) also removed
• Evidence: Present in v2.0.58 at multiple locations, zero matches in v2.0.59

What: The sm1() function for checking CLAUDE_CODE_ENABLE_GROWTHBOOK environment variable was removed.

Details:

• Function was at line 233408 in v2.0.58
• Simplified feature flag initialization flow

What: /todos and /plan commands converted to use new local-jsx rendering pattern.

Details:

• AD9() component at line 499901 for todos display
• wx3() component at line 500269 for plan display
• $VA() wrapper component at line 493331 for async rendering
• UVA() function at line 493327 for synchronous JSX-to-string conversion

What: The "(ctrl+o to expand)" hint is now generated by a dedicated function.

Details:

• keB() function at line 282066 returns the formatted hint
• Previously was an inline string constant rB2 at line 303505 in v2.0.58