Anthropic SDK
Anthropic GitHub org activity, secondary feed for SDK + tooling releases that don't always land on the news page.
Release history
Claude Agent Sdk Python 0.2.172
PyPI
Claude Code Action GitHub 1.0
Claude Code GitHub Action v1.0 unifies configuration into single prompt and claude_args inputs, auto-detects mode, and exposes full CLI capabilities for CI workflows
Claude Agent Sdk Typescript 0.3.308
Claude Agent SDK TypeScript synced to parity with Claude Code v2.1.308
Claude Code 2.1.308
Bug fixes and reliability improvements
Claude Agent Sdk Python 0.2.170
Fixed parallel tool calls being dropped from session message history, ensuring all concurrent tool branches are captured
Claude Code Action GitHub 1.0
Claude Code GitHub Action v1.0 unifies configuration into simplified prompt and claude_args inputs, auto-detects execution mode, and exposes full CLI capabilities for CI workflows
Sandbox Runtime 0.0.81
Windows-only fixes; No impact on other platforms
Claude Code Action GitHub 1.0
Claude Code GitHub Action v1.0 unifies configuration into simpler prompt and claude_args inputs, auto-detects execution mode, and exposes full CLI capabilities for CI/CD workflows
Claude Code Action GitHub 1.0
Claude Code GitHub Action v1.0 unifies configuration into simpler prompt and claude_args inputs with automatic mode detection and full CLI capability access
Claude Code Action 1.0.253
Upstream release notes did not include a readable summary.
Claude Code Action GitHub 1.0
Claude Code GitHub Action v1.0 unifies configuration through single prompt and claude_args inputs, enabling automated PR reviews, test fixes, and issue triage directly in workflows
Claude Code Action 1.0.252
Upstream release notes did not include a readable summary.
Claude Code 2.1.302
Adds a model override for client-side auto mode classification and a toggle for idle compaction
Sandbox Runtime 0.0.80
Ask callback now only permits a connection when explicitly returning true; Tighten any integrations relying on default-allow behavior
Claude Agent Sdk Python 0.2.168
PyPI
Anthropic Cli 1.42.0
Anthropic CLI adds speed parameter to Messages API for request optimization, requires beta header for certain models
Claude Agent Sdk Python 0.2.167
PyPI
Anthropic Sdk Csharp GoogleCloud 0.2.0
Added OpenTelemetry tracing support to AnthropicGoogleCloudClient with separate activity source for observability
Claude Agent Sdk Python 0.2.166
Adds typed hook output classes, replacing untyped dicts; Relevant for developers building custom hooks against the SDK
Claude Code Action GitHub 1.0
Claude Code GitHub Action v1.0 unifies configuration with automatic mode detection and unified prompt/args inputs, enabling AI-assisted PR reviews, CI fixes, and issue triage
Claude Code Action GitHub 1.0
Claude Code GitHub Action v1.0 simplifies AI-assisted CI/CD workflows with automatic mode detection, unified configuration, and full CLI capabilities access
Claude Code Action 1.0.248
Upstream release notes did not include a readable summary.
Claude Code 2.1.296
Adds a code policy key enabling Claude Desktop gateway mode and new subagent frontmatter options for custom agents
Claude Code 2.1.295
Blocks failing hooks, adds upstream timeout limits and request tracking, fixes MCP reconnection issues and file extension handling, improves gateway failover and plugin validation
Claude Agent Sdk Python 0.2.165
Updated bundled Claude CLI to version 2.1.294 and improved release monitoring with Slack alerts for build failures
Claude Code 2.1.294
Fixes prompt/agent hooks written as natural-language instructions not being enforced correctly, including Stop and SubagentStop hooks
Claude Agent Sdk Typescript 0.3.294
Version-matched to Claude Code 2.1.294; Update together if pinning both
Anthropic Sdk Python 1.12.1
Python SDK adds changelog enforcement in CI and documents Claude Console spend-limit listing as early access
Anthropic Sdk Java 2.70.0
Anthropic Java SDK adds getters and builders to structured output classes, fixes empty path parameter handling
Claude Agent Sdk Python 0.2.164
PyPI
Claude Code Action GitHub 1.0
Claude Code's GitHub Action hits 1.0 and general availability, the stabilization point for CI workflows built on it
Claude Code Action 1.0.243
Upstream release notes did not include a readable summary.
Claude Agent Sdk Typescript 0.3.291
Claude Agent SDK TypeScript now matches Claude Code v2.1.291 capabilities for agent development
Claude Agent Sdk Typescript 0.3.289
Brings SDK to parity with Claude Code v2.1.289; Upgrade if pinning to matching versions
Claude Agent Sdk Typescript 0.3.288
Brings the TypeScript SDK to parity with Claude Code v2.1.288; Update via npm/yarn/pnpm/bun as usual
Claude Agent Sdk Python 0.2.163
Updates bundled Claude CLI to 2.1.286; Pins CI model version to avoid default-model triage failures
Claude Code Action 1.0.238
Security hardening for GitHub Actions workflows that invoke Claude
Anthropic Sdk Java 2.67.0
Adds refusal stop reason, session idle events, and Claude Enterprise analytics
Anthropic Sdk Ruby 1.75.0
Adds refusal stop reason, session idle events, and Claude Enterprise analytics
Claude Agent Sdk Typescript 0.3.285
Adds optional read.title to Artifact tool structured read result. Fixes sessions with CLAUDE CODE FORK SUBAGENT=1. Adds provider not allowed to startup failure reason and allowedProviders to Settings type
Claude Code 2.1.284
Adds Claude Sonnet 5.5 as default Sonnet model; 1M context, $2/$10 per Mtok with $0.20 cache reads
Claude Agent Sdk Typescript 0.3.284
Renames skill directory to SlashCommand alias when name is plain and no shipped command exists; Adds ultracodeAvailable and ultracodeRequested to getSettings
Claude Agent Sdk Typescript 0.3.282
Adds support for strictKnownMarketplaces and blockedMarketplaces in host-supplied managedSettings; Allowlist applies where admin policy sets none, blocklist adds to admin's
Claude Code 2.1.282
Adds maxProseWidth setting capping prose width in wide terminals
Claude Code 2.1.281
Adds Claude apps gateway support for newer desktop policy blocks and Bedrock assume-role on upstreams
Claude Code Action 1.0.232
Pins integration tests to claude-opus-5
Claude Agent Sdk Python 0.2.158
Adds ClaudeAgentOptions.verbatim_prompts option, defaults to False
Anthropic Cli 1.35.0
Added Claude Opus 5.5 support, inline tool definitions, and MCP tool-list pinning in beta
Claude Agent Sdk Typescript 0.3.278
Updated to parity with Claude Code v2.1.278
Sandbox Runtime 0.0.77
Fixed multiple path-denial enforcement bugs on Linux and macOS, improved npm resolution performance, and added startup checks for required capabilities
Claude Code 2.1.277
Claude Code adds AGENTS.md project instruction support, fixes conversation failures from empty text blocks, resolves hangs in CLI sessions after errors, and patches multiple tool and state management bugs
Claude Agent Sdk Typescript 0.3.276
Updated to parity with Claude Code v2.1.276
Claude Agent Sdk Python 0.2.154
Bundles Claude CLI version 2.1.274
Claude Agent Sdk Typescript 0.3.272
Parity with Claude Code v2.1.272
Claude Agent Sdk Typescript 0.3.271
Subagents can now run without user, project, and local CLAUDE.md files via omitClaudeMd flag. Fixes listSessions
Claude Agent Sdk Typescript 0.3.270
Updated to parity with Claude Code v2.1.270
Sandbox Runtime 0.0.76
CLI exits after command when control-fd is a pipe; Root caller capabilities dropped in both sandbox modes
Claude Code 2.1.268
Claude apps gateway pricing set in gateway.yaml flows to signed-in clients via managed settings so cost and telemetry match spend meter; Startup warning for gateways when access-control allow cidrs present
Anthropic Sdk Csharp 12.47.0
Anthropic C# SDK adds Managed Agents tool permissions, web_fetch error handling, and public GitHub repository mounting without tokens
Anthropic Sdk Java 2.62.0
Anthropic SDK Java adds Managed Agents auto-mode tool permissions, public GitHub mounting, content_too_large error handling, and streaming performance improvements
Anthropic Sdk Ruby 1.70.0
Adds auto-mode tool permissions for Managed Agents, content-too-large web fetch error code, user-profiles-2026-09-04 beta value
Claude Agent Sdk Typescript 0.3.267
Added browser SSE transport query and sequence tracking, system prompt recording now persists mid-session changes
Claude Agent Sdk Typescript 0.3.266
Updated to parity with Claude Code v2.1.266
Anthropic Sdk Typescript 0.124.0
Adds Claude Tag category and user breakdowns to usage reports, workspace ID support, named types for compliance settings
Claude Agent Sdk Typescript 0.3.261
Plugin delivery over stdin; Fixes Windows start failures with many plugins
Claude Code 2.1.261
Plugin delivery over stdin to avoid Windows command-line length failures
Anthropic Cli 1.30.0
Adds ant apply for managing agents, skills, environments, memory stores, and deployments as code; Adds Claude Tag category and user breakdowns to usage reports
Claude Agent Sdk Typescript 0.3.258
Updated to parity with Claude Code v2.1.258
Anthropic Cli 1.29.0
User profiles add external_user_onboarded_at tracking, organization compliance settings, and memory-store schema updates
Anthropic Sdk Typescript 0.123.0
SDK adds external_user_onboarded_at to user profiles, organization compliance settings, and fixes credential file bundling in non-Node environments
Anthropic Sdk Python 1.3.0
SDK adds user profiles with access type tracking, organization compliance settings, memory-store schema updates, and fixes AWS region resolution, batch result streaming, and multipart file uploads
Claude Agent Sdk Python 0.2.147
Bundles Claude CLI version 2.1.250
Claude Code 2.1.248
Restricted mode removes built-in command and code tools, keeps file tools inside working directory, refuses bypassPermissions, ignores user and project settings
Anthropic Sdk Typescript 0.122.0
Beta files and skills namespaces now use GA shapes, drops dated beta header pins
Anthropic Sdk Python 1.2.0
Files and skills namespaces now use GA shapes; Fixes binary file uploads for AWS Bedrock signing
Anthropic Sdk Php 0.44.0
Adds Admin API organization resources under client.beta.admin and SessionThreadAgentEntry type; Expands AnthropicBeta enum
Anthropic Sdk Ruby 1.66.0
Adds thinking display mode beta, organization usage support, discriminated union module enums
Claude Code Action 1.0.206
Use paths in delete files prompt example; Allow parentheses in valid branch names; Bound download job log against a stalled log fetch
Claude Agent Sdk Typescript 0.3.246
Claude Agent SDK adds message tracing, cost basis reporting, managed pricing controls, and per-task interrupt handling for multi-agent workflows
Claude Agent Sdk Typescript 0.3.245
Claude Agent SDK TypeScript synced to Claude Code v2.1.245, tracking latest model capabilities for agent development
Claude Agent Sdk Typescript 0.3.241
Claude Agent SDK TypeScript now matches Claude Code v2.1.241 capabilities
Claude Code Action 1.0.199
Fixes GraphQL URL handling, MCP server initialization, and tool allowlist validation in GitHub Actions integration
Claude Agent Sdk Typescript 0.3.239
Claude Agent SDK now correctly applies US inference cost multipliers, fixes system prompt boundaries on multi-cloud providers, and improves background task visibility on reconnect
Anthropic Sdk Python 1.0.0
Breaking change: httpx2 upgrade requires dependency refresh
Claude Code Action 1.0.197
Fixed credential handling incompatibility with GitHub Actions checkout v6+ to prevent unintended credential exposure
Anthropic Sdk Java 2.55.0
Anthropic Java SDK adds files and memory store APIs, fixes message stream accumulation bugs, and upgrades build tooling to Gradle 9 and Kotlin 2.3
Claude Agent Sdk Typescript 0.3.234
Claude Agent SDK TypeScript adds ANTHROPIC_API_KEY source reporting, permission-class message delivery, effort-level tracking, and fixes unused type exports
Claude Code Action 1.0.192
Claude Code Action improves GitHub Actions pagination, preserves structured tool output, and detects binary files rather than extension
Anthropic Cli 1.23.0
Anthropic CLI adds output_behavior flag to dream creation for choosing between new memory store or in-place input update
Anthropic Sdk Ruby 1.62.0
Output behavior control for memory stores: create new or update in place. Bedrock now uses default-credentials hook
Anthropic Sdk Python 0.122.0
Adds output-behavior control for memory-store creation. Fixes async SigV4 signing in Bedrock clients
Claude Agent Sdk Typescript 0.3.229
SDK now exposes terminal slash commands to clients and properly surfaces request-body-size limits as API errors instead of image errors
Anthropic Sdk Go 1.63.0
Go SDK adds output_behavior control for dream memory creation, fixes agent toolset path handling and Vertex auth wrapping
Claude Agent Sdk Typescript 0.3.225
Fixed background subagents failing to resume after shell commands or monitors complete in headless SDK sessions
Claude Code 2.1.225
Claude Code 2.1.225 fixes OAuth token handling in headless sessions, MCP keychain timeouts, safety-filter retry loops, and Remote Control session resume breakage on large conversations
Anthropic Sdk Csharp 12.40.0
C# SDK adds mid-conversation tool changes, session budgets, advisor tools, and GitHub skill auto-loading for Claude API integration
Anthropic Sdk Typescript 0.116.0
Adds session budgets, mid-conversation tool changes beta, advisor tool, and pinned inference location
Anthropic Sdk Go 1.62.0
Adds session budgets, advisor tool, mid-conversation tool changes beta, and pinned inference location
Claude Code 2.1.224
Claude Code adds self-hosted environments, cross-session messaging, archive plugin installation, and sandbox credential-masking for Team/Enterprise users
Claude Code Action 1.0.185
Claude Code Action now derives trigger timestamps for events, pins bun config for MCP servers, matches downloaded images ID, and validates collaborator permissions for workflow runs
Claude Agent Sdk Typescript 0.3.222
Fixed resumed agent sessions not inheriting user settings like API keys, environment variables, hooks, and permissions
Claude Code 2.1.221
Claude Code 2.1.221 adds Focus view for cleaner chat UI, sandbox credential masking on Linux/WSL, permission-check security fixes for Bash and PowerShell, and MCP server connection reliability improvements
Claude Agent Sdk Typescript 0.3.221
Improved skills validation to reject malformed names, fixed external MCP servers not connecting before first turn preventing tool calls
Claude Code 2.1.219
Claude Opus 5 now default with 1M context, sandbox network allowlist controls added, nested subagent forwarding in stream-json, and various fixes for permission handling and UI state
Claude Agent Sdk Typescript 0.3.219
Adds interrupt cancellation, fast-mode diagnostics, directory lifecycle hooks, network allowlist controls, and workflow sizing guidance for agent orchestration
Anthropic Sdk Csharp 12.39.0
C# SDK adds Claude Opus 5 model, tool addition/removal blocks, tool_change events, and fixes streaming parallel tool-use logic
Claude Agent Sdk Python 0.2.126
SDK now surfaces query termination reasons and properly types model usage with provider identification for cross-provider model tracking
Claude Code Action 1.0.181
Claude Code Action now shares WIF credentials across spawned processes instead of creating duplicates
Anthropic Cli 1.19.0
Adds support for Managed Agents model effort, initial session events, threads delta streaming
Anthropic Sdk Csharp 12.37.0
C# SDK adds Managed Agents model effort controls, initial session events, and threads delta streaming support
Anthropic Sdk Typescript 0.113.0
Adds support for Managed Agents model effort, initial session events, threads delta streaming
Buffa 0.9.0
Changie fragment files adopted to end changelog merge conflicts. Codegen and struct evolution policy documented
Claude Agent Sdk Typescript 0.3.212
Fixed CLI argument parsing for session flags and added resolved model visibility in multi-model agent tool outputs
Claude Code 2.1.212
/fork separates conversation branches into background sessions, while /subtask replaces in-session subagents; Adds runaway-loop safeguards, long-running tool backgrounding, and session-resumption picker
Anthropic Sdk Java 2.49.0
Anthropic Java SDK adds dreaming and MCP Tunnels support, plus session delta accumulator for agent message previews
Anthropic Sdk Php 0.37.0
Anthropic PHP SDK adds dreaming and MCP Tunnels support, plus session delta accumulator for agent message previews
Claude Code Action 1.0.174
Claude Code Action now redacts GitHub user-to-server tokens from logs to prevent credential exposure
Claude Agent Sdk Typescript 0.3.210
Bash tool output now includes timedOutAfterMs field when commands are auto-backgrounded due to timeout
Claude Code 2.1.209
Fixed dialog blocking in Claude agents background sessions that prevented /model and other commands from executing
Claude Agent Sdk Python 0.2.116
Bundles Claude CLI 2.1.207; Fixes CI workspace trust for project-scoped permission grants
Claude Code 2.1.206
Claude Code adds directory suggestions to /cd, auto-confirms git pushes to configured remotes, fixes MCP timeouts and OAuth re-authentication, and improves agents view usability