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Added `claude_code_version` to the `initialize` control response so clients know the CLI version before the first turn - Added `autoCompactWindow` to `AgentDefinition`, so a subagent can auto-compact earlier than the main conversation's window - Fixed the `sandbox` option discarding an inline `settings.sandbox` block: the two now merge, the option's values win, and deny and credential lists from both sides are combined - Changed the default limit on MCP tool descriptions sent up front and on MCP server instructions, in-process SDK servers included, from 2,048 to 4,096 characters - Changed permission answers that arrive after a restart to be parsed like live ones: over 4,096 `updatedPermissions` entries count as a denial, and a malformed list is ignored as a whole - Updated to parity with Claude Code v2.1.296 Update ```sh npm install @anthropic-ai/claude-agent-sdk@0.3.296 or yarn add @anthropic-ai/claude-agent-sdk@0.3.296 or pnpm add @anthropic-ai/claude-agent-sdk@0.3.296 or bun add @anthropic-ai/claude-agent-sdk@0.3.296 ```"},"evidence_pages":[],"related_signals":[{"id":"e4337f81-ccaf-4dfb-bcef-ea97abf74895","url":"https://onlylabs.fyi/signals/e4337f81-ccaf-4dfb-bcef-ea97abf74895","source_url":"https://github.com/anthropics/claude-code-action/releases/tag/v1.0.248","title":"anthropics/claude-code-action v1.0.248","context":"anthropics/claude-code-action","kind":{"key":"release","label":"Release"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-10-09T19:37:39+00:00","first_seen_at":"2026-10-10T07:00:42.921534+00:00","date_source":"source"},{"id":"e1565007-a2dc-452a-bbf4-43da6fb5cd87","url":"https://onlylabs.fyi/signals/e1565007-a2dc-452a-bbf4-43da6fb5cd87","source_url":"https://github.com/anthropics/claude-code/releases/tag/v2.1.296","title":"anthropics/claude-code v2.1.296","context":"anthropics/claude-code","kind":{"key":"release","label":"Release"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-10-09T19:28:59+00:00","first_seen_at":"2026-10-10T07:00:42.921534+00:00","date_source":"source"},{"id":"f1305f4a-076b-43df-b99a-6fe4f5c2304b","url":"https://onlylabs.fyi/signals/f1305f4a-076b-43df-b99a-6fe4f5c2304b","source_url":"https://github.com/anthropics/anthropic-cli/releases/tag/v1.40.0","title":"anthropics/anthropic-cli v1.40.0","context":"anthropics/anthropic-cli","kind":{"key":"release","label":"Release"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-10-09T15:51:28+00:00","first_seen_at":"2026-10-10T07:00:42.921534+00:00","date_source":"source"},{"id":"32ddbca1-e40a-4914-b78f-b8d344e8fdd0","url":"https://onlylabs.fyi/signals/32ddbca1-e40a-4914-b78f-b8d344e8fdd0","source_url":"https://github.com/anthropics/anthropic-sdk-java/releases/tag/v2.71.0","title":"anthropics/anthropic-sdk-java v2.71.0","context":"anthropics/anthropic-sdk-java","kind":{"key":"release","label":"Release"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-10-09T15:36:42+00:00","first_seen_at":"2026-10-10T07:00:42.921534+00:00","date_source":"source"},{"id":"af9cd498-f360-4f5b-a019-66030da83d9c","url":"https://onlylabs.fyi/signals/af9cd498-f360-4f5b-a019-66030da83d9c","source_url":"https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.133.0","title":"anthropics/anthropic-sdk-typescript sdk-v0.133.0","context":"anthropics/anthropic-sdk-typescript","kind":{"key":"release","label":"Release"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-10-09T15:35:41+00:00","first_seen_at":"2026-10-10T07:00:42.921534+00:00","date_source":"source"},{"id":"e7f1edff-b37c-40d7-a49a-37534b90407f","url":"https://onlylabs.fyi/signals/e7f1edff-b37c-40d7-a49a-37534b90407f","source_url":"https://github.com/anthropics/anthropic-sdk-ruby/releases/tag/v1.78.0","title":"anthropics/anthropic-sdk-ruby v1.78.0","context":"anthropics/anthropic-sdk-ruby","kind":{"key":"release","label":"Release"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-10-09T15:35:07+00:00","first_seen_at":"2026-10-10T07:00:42.921534+00:00","date_source":"source"}]}