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This page contains research findings derived from decompiled source code of @anthropic-ai/claude-code v2.1.88. These are features found in source but not yet publicly released. All timelines and details are inferred from code comments and structure — no official release dates are implied. All source code is the intellectual property of Anthropic.

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Next Model: Numbat

The most concrete evidence of an upcoming model launch in the v2.1.88 source: 
// src/constants/prompts.ts:402
// @[MODEL LAUNCH]: Remove this section when we launch numbat.
Numbat (袋食蚁兽) is confirmed as the codename for a future model. The comment indicates the output efficiency section will be revised at launch, suggesting Numbat may have improved native output control.

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In-Development Version Numbers

The undercover mode instructions explicitly list version numbers to suppress, revealing models in active development: 
// src/utils/undercover.ts:49
- Unreleased model version numbers (e.g., opus-4-7, sonnet-4-8)
Opus 4.7 and Sonnet 4.8 are in development.

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Codename Evolution Chain

Fennec (耳廓狐)  →  Opus 4.6  →  [Numbat?]
Capybara (水豚)  →  Sonnet v8  →  [?]
Tengu (天狗)     →  telemetry/product prefix
The Fennec-to-Opus migration is documented with a dedicated migration script: 
// src/migrations/migrateFennecToOpus.ts:7-11
// fennec-latest           → opus
// fennec-latest[1m]       → opus[1m]
// fennec-fast-latest      → opus[1m] + fast mode

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Model Launch Checklist

The codebase contains 20+ @[MODEL LAUNCH] markers, documenting what must be updated at each launch:
  • Default model names (FRONTIER_MODEL_NAME)
  • Model family IDs
  • Knowledge cutoff dates
  • Pricing tables
  • Context window configurations
  • Thinking mode support flags
  • Display name mappings
  • Migration scripts

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KAIROS — Autonomous Agent Mode

KAIROS is the largest unreleased feature found in the source. It transforms Claude Code from a reactive assistant into an always-on, proactive autonomous agent that can act without user prompting.

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System Prompt (excerpts)

Source: src/constants/prompts.ts:860-913 
You are running autonomously.
You will receive <tick> prompts that keep you alive between turns.
If you have nothing useful to do, call SleepTool.
Bias toward action — read files, make changes, commit without asking.

## Terminal focus
- Unfocused: The user is away. Lean heavily into autonomous action.
- Focused: The user is watching. Be more collaborative.

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KAIROS Tool Set

ToolFeature FlagPurpose
SleepToolKAIROS / PROACTIVEControl pacing between autonomous actions
SendUserFileToolKAIROSProactively send files to users
PushNotificationToolKAIROS / KAIROS_PUSH_NOTIFICATIONPush notifications to user devices
SubscribePRToolKAIROS_GITHUB_WEBHOOKSSubscribe to GitHub PR webhook events
BriefToolKAIROS_BRIEFProactive status updates

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Behavior Summary

  • Operates on <tick> heartbeat prompts between turns
  • Adjusts autonomy level based on terminal focus state (user present vs. away)
  • Can commit, push, and make code decisions independently
  • Sends proactive push notifications and status updates
  • Monitors GitHub PRs for changes via webhooks

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Voice Mode

Push-to-talk voice input is fully implemented in v2.1.88 but gated behind the VOICE_MODE feature flag. 
// src/voice/voiceModeEnabled.ts
// Connects to Anthropic's voice_stream WebSocket endpoint
// Uses conversation_engine backed models for speech-to-text
// Hold-to-talk: hold keybinding to record, release to submit
Voice mode uses mTLS for WebSocket connections to Anthropic’s voice_stream endpoint. It is restricted to OAuth users only — API key, Bedrock, and Vertex configurations are not supported.
Key properties:
  • Interaction model: Hold-to-talk (hold key to record, release to submit)
  • Authentication: OAuth only (no API key / Bedrock / Vertex)
  • Transport: mTLS WebSocket
  • Kill switch: tengu_amber_quartz_disabled

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Unreleased Tools

Tools found in source but stripped from the published bundle via dead-code elimination (DCE):
ToolFeature FlagDescription
WebBrowserToolWEB_BROWSER_TOOLBuilt-in browser automation (internal codename: bagel)
TerminalCaptureToolTERMINAL_PANELTerminal panel capture and monitoring
WorkflowToolWORKFLOW_SCRIPTSExecute predefined workflow scripts
MonitorToolMONITOR_TOOLMCP server / process monitoring
SnipToolHISTORY_SNIPConversation history snipping and truncation
ListPeersToolUDS_INBOXUnix domain socket peer discovery
RemoteTriggerToolAGENT_TRIGGERS_REMOTERemote agent triggering
TungstenToolant (internal)Internal performance monitoring panel
VerifyPlanExecutionToolCLAUDE_CODE_VERIFY_PLANPlan execution verification
OverflowTestToolOVERFLOW_TEST_TOOLContext overflow testing
SubscribePRToolKAIROS_GITHUB_WEBHOOKSGitHub PR webhook subscriptions
Source: README.md (Feature-Gated Tools section), src/tools/

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Coordinator Mode

A multi-agent coordination system is partially implemented: 
// src/coordinator/coordinatorMode.ts
// Feature flag: COORDINATOR_MODE
Enables coordinated task execution across multiple agents with shared state and inter-agent messaging. The worker agent module (coordinator/workerAgent.js) is internal-only and not present in the published npm package.

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Buddy System (Virtual Pets)

A complete virtual pet companion system is implemented but not yet launched:
Source: src/buddy/
  • 18 species: duck, goose, blob, cat, dragon, octopus, owl, penguin, turtle, snail, ghost, axolotl, capybara, cactus, robot, rabbit, mushroom, chonk
  • 5 rarity tiers: Common (60%), Uncommon (25%), Rare (10%), Epic (4%), Legendary (1%)
  • 7 hats: crown, tophat, propeller, halo, wizard, beanie, tinyduck
  • 5 stats: DEBUGGING, PATIENCE, CHAOS, WISDOM, SNARK
  • 1% shiny chance: Sparkle variant of any species
  • Deterministic generation: Pet identity is derived from a hash of the user’s ID
The species name “capybara” collides with the model codename canary in scripts/excluded-strings.txt. The build system works around this by constructing the string at runtime via String.fromCharCode() to keep the literal out of the compiled bundle.

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Dream Task

Background memory consolidation is implemented as a sub-agent: 
// src/tasks/DreamTask/
// Auto-dreaming feature that works in the background
// Controlled by 'tengu_onyx_plover' feature flag
When enabled, the AI autonomously processes and consolidates memories during idle time without user interaction.

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The Three Directions

New Models

Numbat is the next confirmed codename. Opus 4.7 and Sonnet 4.8 are explicitly listed as in-development version numbers to suppress in commit messages.

Autonomous Agent

KAIROS mode enables unattended operation with <tick> heartbeats, proactive commits, push notifications, and GitHub PR monitoring — a shift from reactive assistant to background agent.

Multi-modal & Automation

Voice input is ready and gated. Browser automation (WebBrowserTool / codename “bagel”) and workflow scripting are implemented and waiting on feature flag release.
Claude Code is evolving from a coding assistant into an always-on autonomous development agent. The KAIROS system prompt’s explicit instruction to “bias toward action — read files, make changes, commit without asking” when the user is away is the clearest signal of this direction.

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