Reverse Engineering Findings — Antigravity Language Server Hub

Binary Under Analysis

Property	Value
Binary	agy — Antigravity CLI
Path	/Users/alefita/.local/bin/agy
Size	~99 MB
Architecture	ARM64 (Apple Silicon)
Language	Go (gc compiler)
Internal Package Root	github.com/anthropics/jetsky/internal/...
Decompilation Tool	Ghidra MCP (automated analysis)
Total Decompiled Files	3,305 .c files
Unique Package Prefixes	130+

The binary was imported into Ghidra, auto-analyzed, and then systematically decompiled. A custom Python pclntab parser (scratch/go_pclntab_parser.py) extracted function names, source file paths, and line number mappings from the Go binary's Plan 9 Line Number Table. This produced an index of all Go functions (scratch/go_functions.json) that guided the decompilation campaign.

Subsystem Inventory

The 3,305 decompiled functions cluster into distinct subsystems. Below is the full inventory grouped by architectural function.

Language Server Subsystem

The core LSP (Language Server Protocol) implementation that powers code intelligence.

Package	Functions	Key Components
lsp	Multiple	LSP server initialization, document sync, diagnostics
language	Multiple	Language detection, file type resolution
completion	Multiple	Code completion engine
codesearch	Multiple	Codebase search and indexing
opensearch	Multiple	Open search protocol integration
diff	Multiple	Diff computation and application
applyedit	5	HandleFastApply, applyReplacementsToContent, filterFastApplyDiffToRange, handleFastApplyFallback, handleRepairFallback

API Server Subsystem

The gRPC-based API server that proxies requests to Google's backend.

Package	Functions	Key Components
api_server_go_proto	30+	ApiServerService with 15+ RPC handlers
v1internal_go_proto	25+	CloudCode service with 15+ RPC methods
analytics_go_proto	6	AnalyticsService — telemetry recording

ApiServerService RPC Methods (Extracted)

Method	Purpose
ApplyTrajectoryHeuristics	Trajectory optimization
CreateTrajectoryShareStream	Share trajectories across sessions
GetCascadeModelConfigs	Cascade model configuration retrieval
GetCommandModelConfigs	Command model configuration
GetCompletionExamples	Few-shot completion examples
GetDeploymentConfig	Deployment configuration
GetEmbeddings	Vector embedding generation
GetImageGeneration	Image generation endpoints
GetMQuery	Multi-query search
GetMcpServerTemplates	MCP server template registry
GetModelInfos	Model metadata retrieval
GetModelStatuses	Model health/status checks
GetTeamOrganizationalControls	Team-level access controls
GetTranscription	Audio transcription
GetUnleashContextFields	Feature flag context
GetWebDocsOptions	Documentation options
GetWebSearchRedirect	Web search redirect
GetWebSearchResults	Web search results
ProvideFeedback	User feedback collection
RecordAsyncTelemetry	Async telemetry recording

CloudCode Service Methods (v1internal)

Method	Purpose
CompleteCode	Code completion
FetchAdminControls	Admin control panel
FetchCodeCustomizationState	Customization state
GenerateChat	Chat generation
GetCodeAssistGlobalUserSetting	Global user settings
InternalAtomicAgenticChat	Atomic agentic chat (internal)
ListAgents	Agent enumeration
ListCloudAICompanionProjects	Companion project listing
ListExperiments	A/B experiment listing
ListModelConfigs	Model configuration listing
ListRemoteRepositories	Remote repo listing
LoadCodeAssist	Code assist initialization
MigrateDatabaseCode	Database migration
OnboardUser	User onboarding flow
RecordClientEvent	Client event telemetry
RecordCodeAssistMetrics	Code assist metrics
RecordSmartchoicesFeedback	Smart choices feedback
SearchSnippets	Snippet search
SetCodeAssistGlobalUserSetting	Setting update
TransformCode	Code transformation

Extension Server Subsystem

The plugin/extension management layer.

Package	Functions	Key Components
extension	Multiple	Extension lifecycle management
exte / exten	Multiple	Extension loading and initialization
sidecars	Multiple	Sidecar process management
mcp / mcpcore	Multiple	Model Context Protocol server integration
launchmanager	Multiple	Extension launch orchestration
sdk / sdkprocess	Multiple	SDK process management

Decorators Subsystem

Prompt decoration and template management.

Package	Functions	Key Components
decorators	Multiple	Prompt decorator chain
templateprovider	3	TemplateProvider, loadHelpersFromDir
prompt	Multiple	Prompt construction and formatting
ephemeral	Multiple	Ephemeral message handling

Knowledge Subsystem

Document and knowledge base management.

Package	Functions	Key Components
knowledge	Multiple	Knowledge item management
document / documentmanager	Multiple	Document lifecycle
doc	Multiple	Document parsing
notebook	Multiple	Notebook support
web_scraping	Multiple	Web content extraction

Tool Subsystem

Tool definitions, execution, and conversion.

Package	Functions	Key Components
tools	7+	RunCommandToolConverter, GrepSearchToolConverter, ViewFileToolConverter, WaitToolConverter, ListPermissionsToolConverter, CommandStatusToolConverter, SplitCompletionProvider
toolconverters	Multiple	ReadURLContentToolConverter
tooloverrides	1	ToolOverrideMapper
tool_parsers	1	ChatTranscriptToolFormatter
tool	Multiple	Base tool infrastructure
slashcommands	Multiple	Slash command processing

Browser Subsystem

Full browser automation with CDP (Chrome DevTools Protocol).

Package	Functions	Key Components
browser	30+	Screenshot capture, DOM reading, JavaScript execution, mouse/keyboard events, page management, scroll/wheel handlers
browserabstractions	Multiple	Browser abstraction layer
cdpclient	Multiple	Chrome DevTools Protocol client
chrome	Multiple	Chrome integration
webm	Multiple	WebM media handling

Browser Functions (Partial List)

Function	Purpose
NewCaptureBrowserScreenshotHandler	Screenshot capture
NewCaptureBrowserConsoleLogsHandler	Console log capture
NewListBrowserPagesHandler	Page enumeration
NewReadBrowserPageHandler	Page content reading
NewBrowserScrollHandler / ScrollDown / ScrollUp	Scroll control
NewBrowserMouseWheelHandler	Mouse wheel simulation
executeJavaScriptAction	JS execution in page context
mouseWheelAction / pressKeyAction	Input simulation
imageToPNGImageProto	Image format conversion
makeClickFeedbackPNG / makeDragFeedbackPNGs	Visual feedback generation
buildMarkdownTrajectorySummary	Trajectory summarization
createScratchpadFile	Scratchpad file creation

Agent & Executor Subsystem

Agent lifecycle, execution, and state management.

Package	Functions	Key Components
agent_state_component	35+	AgentState, SubagentUpdateForwarder, trajectory merging, pub/sub
agentexecutor	12+	AgentExecutor (Run, cancel, state transitions), CascadeExecutor
subagent	Multiple	ConversationSubagentManager
agent	15+	Step handling, payload cases (set operations), model request cloning
agentapi	2	sendMessageHandler (Execute, Metadata)
executor / executors	Multiple	Execution infrastructure
cascade	Multiple	Cascade execution model

Trajectory Subsystem

Conversation trajectory management and persistence.

Package	Functions	Key Components
trajectory	15+	protoTrajectory, StepHeaderMetadata, StepHeaderTaskDetails, ChatModelHeader, GeneratorMetadataHeader, PlannerResponseStepView
traj	2	processPendingUpdates, startCommitWorker
trajectorystore	2	Manager, ProtoStore
dbtrajectory	Multiple	Database-backed trajectory storage
recording	Multiple	Session recording
battlemode	10+	trajectoryWithReplacer — step replacement, cloning, status indexing

Authentication Subsystem

OAuth2 authentication and keychain management.

Package	Functions	Key Components
authclient	12	AuthClient — LoginWithBrowser, refreshAndSaveToken, GetAuthStatus, GetGrantedScopes, ValidateProject, performTerminalAuthFlow, validateLoginAndUpdateStatus, generateState, openBrowser

Streaming Subsystem

Real-time streaming of model responses.

Package	Functions	Key Components
streaming	4	BaseStreamReceiver, CompletionLatencyInfo, CompletionWithLatencyInfo

Configuration & Experiments

Package	Functions	Key Components
config	Multiple	Configuration management
experiments	Multiple	A/B experiment framework
unleash	4	UnleashWrapper, UnleashWrapperFactory, contextFieldState, InitializeFactory
customizations	Multiple	User/team customizations
credits	Multiple	Credit/quota management

Workspace & VCS

Package	Functions	Key Components
workspace_manager	15+	WorkspaceInfoManager, WorkspaceFiles, WorkspaceInfo, file tree traversal
vcs	8	Repository, GitRepoInfo, VcsCache, IsRepoPubliclyAccessible
git	Multiple	Git operations
commit	Multiple	Commit handling
scm	Multiple	Source code management

Other Subsystems

Package	Functions	Key Components
model / modelapiinterface / modelapiccpa	Multiple	Model API abstraction layer
chat / chatconverters	Multiple	Chat message handling
command	Multiple	Command execution
terminal	2	ShellCommandTracker, StaticTerminalShellCommand
imagegen	Multiple	Image generation
hooks / prehooks / posthooks / pretoolhooks / stophooks	Multiple	Hook system (lifecycle events)
permissions	Multiple	Permission management
profiling	Multiple	Performance profiling
telemetry / telemetryclient / telemetryinterface	5+	AntigravityClient, clearcutLogger, DummyTelemetryClient
statesync	3	UnifiedStateSyncClient, subscription management
stepmanager	1	StepManager
tokenizer	1	EstimateTokenCounter
sandboxproxy / sbox	Multiple	Sandbox execution
netbox	Multiple	Network box/proxy
eval	Multiple	Evaluation framework
datasets	Multiple	Dataset management
trainer / trainer_go_proto	3	TrainerConfig, BaseModelConfig, RoPEEmbeddingConfig
gemini	Multiple	Gemini-specific integration
codeium	Multiple	Codeium legacy integration
interceptor	Multiple	Request/response interception
platform	Multiple	Platform abstraction
jsonhook	Multiple	JSON hook processing
multicall	Multiple	Batched RPC calls
reactive	Multiple	Reactive state management
ssh / remoting / reversetunnel	Multiple	Remote connection infrastructure
checkpoint	Multiple	State checkpointing
pipe	Multiple	Pipe-based communication
integration	Multiple	Integration layer

Protobuf Schemas (Reconstructed)

ModelInfo (25 Fields)

syntax = "proto3";
package jetsky.model;

message ModelInfo {
  string model_id = 1;
  string display_name = 2;
  string description = 3;
  ModelProvider provider = 4;
  ModelType model_type = 5;
  BackendType backend_type = 6;
  HybridDeployment hybrid_deployment = 7;
  int32 max_input_tokens = 8;
  int32 max_output_tokens = 9;
  float temperature_default = 10;
  float temperature_min = 11;
  float temperature_max = 12;
  bool supports_tools = 13;
  bool supports_streaming = 14;
  bool supports_system_prompt = 15;
  bool supports_images = 16;
  string api_endpoint = 17;
  string api_key_env = 18;
  PromptTemplaterType prompt_templater = 19;
  ToolFormatterType tool_formatter = 20;
  // Fields 21-25: pricing, capabilities, metadata (not fully reconstructed)
}

ProductEvent (Telemetry)

message ProductEvent {
  string event_name = 1;
  string api_key = 2;
  string installation_id = 3;
  string ide_name = 4;
  string os = 5;
  string codeium_version = 6;
  int64 timestamp = 7;
  map<string, string> properties = 8;
}

gRPC Service Definition

service LanguageServerService {
  rpc ValidateProject (ValidateProjectRequest) returns (ValidateProjectResponse);
  rpc GetCompletions (GetCompletionsRequest) returns (GetCompletionsResponse);
  rpc Chat (ChatRequest) returns (stream ChatResponse);
}

Credentials Map

Three distinct OAuth2 Client ID/Secret pairs were found in the binary:

Consumer (ACTIVE)

Field	Value
Client ID	1071006060591-tmhssin2h21lcre235vtolojh4g403ep
Client Secret	GOCSPX-REDACTED-1
Usage	Google One / Consumer OAuth2
Status	Active — used by agy CLI + IDE + Master

Enterprise

Field	Value
Client ID	884354919052-36trc1jjb3tguiac32ov6cod268c5blh
Client Secret	GOCSPX-REDACTED-2
Usage	GCP / Code Assist enterprise flows
Status	Available in binary, not active

Legacy (DISCONTINUED)

Field	Value
Client ID	681255809395-oo8ft2oprdrnp9e3aqf6av3hmdib135j
Client Secret	GOCSPX-REDACTED-3
Usage	opencode-gemini-auth (legacy Antigravity)
Status	Discontinued — credential file deleted

Installation IDs

Component	Installation ID	Shared With
Antigravity Master	aba9d234-1284-4a20-98e6-0fa3cf57de66	IDE
Antigravity IDE	aba9d234-1284-4a20-98e6-0fa3cf57de66	Master
Antigravity CLI	17ac69b8-1279-4ce5-9201-10ee019953cd	None

Enums and Constants

PromptTemplaterType

Value	Name	Purpose
0	UNSPECIFIED	Default
1	NONE	Raw prompt, no template
2	GENERAL	General-purpose template
3	GEMINI_LEGACY	Legacy Gemini format
4	DEEPSEEK_REASONER	DeepSeek reasoning format
5	GEMINI_2_0	Gemini 2.0 format

The presence of DEEPSEEK_REASONER confirms internal testing/support for DeepSeek models within the JETSKY ecosystem.

ToolFormatterType

Value	Name	Purpose
0	UNSPECIFIED	Default
1	NATIVE	Model-native tool format (OpenAI, Anthropic)
2	XML	XML-style tool definitions
3	MARKDOWN	Markdown-style tool descriptions

APIProvider

Value	Name	Purpose
0	UNSPECIFIED	Default
1	CODEIUM	Legacy Codeium API
2	CLOUD_CODE	GCP Cloud Code API
3	FIRST_PARTY	Google 1st party API

ModelProvider

Value	Name	Purpose
0	UNSPECIFIED	Default
1	OPENAI	OpenAI models
2	ANTHROPIC	Claude models
3	GOOGLE	Gemini models
4	CUSTOM	Custom/local models

BackendType

Value	Name	Purpose
0	UNSPECIFIED	Default
1	CLOUD	Cloud-hosted model
2	LOCAL	Locally-running model
3	HYBRID	Hybrid deployment

ModelType

Value	Name	Purpose
0	UNSPECIFIED	Default
1	CHAT	Chat/conversational
2	COMPLETION	Completion
3	EMBEDDING	Embedding
4	MULTIMODAL	Multi-modal

HybridDeployment

Value	Name	Purpose
0	UNSPECIFIED	Default
1	CLOUD_ONLY	Cloud-only
2	LOCAL_ONLY	Local-only
3	CLOUD_WITH_LOCAL_FALLBACK	Cloud primary, local fallback
4	LOCAL_WITH_CLOUD_FALLBACK	Local primary, cloud fallback

Auth Method

Value	Purpose
consumer	Google One / personal OAuth
enterprise	GCP / Code Assist OAuth
api_key	API key authentication

Key String Extraction Highlights

String	Context
"gemini"	Keychain service name
"antigravity"	Keychain account name
"go-keyring-base64:"	Keychain value prefix
"consumer"	Auth method identifier
"https://oauth2.googleapis.com/token"	Token refresh endpoint
"https://cloudcode-pa.googleapis.com"	gRPC proxy endpoint
"Bearer "	HTTP authorization token prefix

HTTP Headers (Binary Strings)

API Call Headers

Header	Purpose
Authorization	Bearer <access_token>
x-api-key	API key (non-OAuth flows)
x-goog-api-client	Client identification
x-goog-user-project	Billing project
x-goog-sherlog-Link	Internal logging/tracing
x-goog-cloud-target-resource	Target resource routing
X-Goog-Ext-525006001-bin	Binary extension data
X-Goog-Drive-Resource-Keys	Drive resource keys
X-Goog-Request-Reason	Audit trail
x-codeium-csrf-token	CSRF protection
X-Http-Session-Id	Session tracking

.pb File Analysis

implicit/ Directory

Files in ~/.gemini/antigravity-ide/data/implicit/ are encrypted — not raw protobuf. Multiple decoding attempts failed. Likely trajectory files from the pre-upgrade version of Antigravity IDE.

agyhub_summaries/

Files in the agyhub summaries directory are raw protobuf — successfully decoded. They contain session summaries and metadata.

Validation Endpoints

Endpoint	Purpose
https://www.googleapis.com/oauth2/v3/tokeninfo?access_token=<token>	Validate token, check scopes, get metadata
https://www.googleapis.com/oauth2/v1/userinfo	Get user profile data

Deep-Dive Pages

For detailed analysis of the patterns and systems revealed by this RE work:

Topic	Deep-Dive Page	Key Content
Decompiled patterns	sdk-test-decompiled-patterns	10 architectural patterns (Cascade, Battle Mode, Subagents, MCP, Browser, Knowledge, CEL, Feature Flags)
Localharness architecture	sdk-test-localharness	Go binary subprocess model, WebSocket protocol, connection lifecycle
Protobuf wire format	sdk-test-protobuf	Every message type extracted from localharness_pb2.py
Authentication chain	sdk-test-auth-chain	Auth functions decompiled from authclient.* and auth.*
gRPC protocol	sdk-test-grpc-protocol	Service descriptors from language_server_go_grpc.*
DeepSeek + Heartbeat	sdk-test-deepseek-heartbeat	PromptTemplaterType enum, DeepSeek integration

Cross-References

• sdk-test-antigravity-sdk — Full SDK reference (Agent, Conversation, types, tools, hooks, triggers)
• sdk-test-architecture — Architecture synthesis including auth chain, token lifecycle, gRPC protocol
• sdk-test-integrations — Integration points: DeepSeek, heartbeat, Gemma 4, SDK
• sdk-test-synthesis — Epiphany synthesis and RFC-001 proposal
• antigravity-2.0 — The broader Antigravity ecosystem
• claude-desktop-bundles — Related reverse engineering work