{"name":"ANTHROPIC_WEBHOOK_SIGNING_KEY","slug":"anthropic-webhook-signing-key","family":"env","title":"Environment variables","noun":"environment variable","description":"The bundled client now reads a webhook signing key from ANTHROPIC_WEBHOOK_SIGNING_KEY.","description_source":"entry","described_by":{"version":"2.1.228","anchor":"bundled-sdk-client-reads-a-webhook-signing-key-from-the-envi"},"presence":{"first_seen":null,"removed_in":null,"in_current_build":false,"newest_mined":"2.1.308","builds":0,"mined_builds":149,"first_cited":{"version":"2.1.228","released_at":"2026-08-11 17:45:45","spans":1}},"aliases":[],"entries":[{"version":"2.1.228","anchor":"bundled-sdk-client-reads-a-webhook-signing-key-from-the-envi","heading":"Bundled SDK client reads a webhook signing key from the environment","line":"The bundled client now reads a webhook signing key from ANTHROPIC_WEBHOOK_SIGNING_KEY.","released_at":"2026-08-11 17:45:45","reason":"named in this entry, found in this entry's text"}],"entries_total":1,"docs":[{"source":"api","path":"managed-agents\/self-hosted-sandboxes","title":"spawn.sh: called once per claimed work item","documented":false},{"source":"api","path":"managed-agents\/self-hosted-sandboxes-reference","title":"self-hosted-sandboxes-reference","documented":false},{"source":"api","path":"managed-agents\/self-hosted-sandboxes-workers","title":"self-hosted-sandboxes-workers","documented":false},{"source":"api","path":"managed-agents\/webhooks","title":"webhooks","documented":false}],"docs_total":4,"gates":[],"related":[{"name":"ANTHROPIC_API_KEY","slug":"anthropic-api-key","description":"API key sent as `X-Api-Key` header. When set, this key is used instead of your Claude Pro, Max, Team, or Enterprise subscription even if you are logged in. In non-interactive mode (`-p`), the key is always used when present. In interactive mode, you are prompted to approve the key once before it overrides your subscription. To use your subscription instead, run `unset ANTHROPIC_API_KEY`"},{"name":"ANTHROPIC_AUTH_TOKEN","slug":"anthropic-auth-token","description":"Custom value for the `Authorization` header (the value you set here will be prefixed with `Bearer `)"},{"name":"ANTHROPIC_AWS_API_KEY","slug":"anthropic-aws-api-key","description":"Workspace API key for [Claude Platform on AWS](\/docs\/en\/claude-platform-on-aws), generated in the AWS Console. Sent as `x-api-key` and takes precedence over AWS SigV4"},{"name":"ANTHROPIC_AWS_BASE_URL","slug":"anthropic-aws-base-url","description":"Override the [Claude Platform on AWS](\/docs\/en\/claude-platform-on-aws) endpoint URL. Use for custom regions or when routing through an [LLM gateway](\/docs\/en\/llm-gateway). Defaults to `https:\/\/aws-external-anthropic.{region}.api.aws`. Claude Code resolves the region with the [same precedence as on Amazon Bedrock](\/docs\/en\/amazon-bedrock#3-configure-claude-code)"},{"name":"ANTHROPIC_AWS_WORKSPACE_ID","slug":"anthropic-aws-workspace-id","description":"Required for [Claude Platform on AWS](\/docs\/en\/claude-platform-on-aws). Sent on every request as the `anthropic-workspace-id` header"},{"name":"ANTHROPIC_BASE_URL","slug":"anthropic-base-url","description":"Override the API endpoint to route requests through a proxy or gateway. When set to a non-first-party host, [MCP tool search](\/docs\/en\/mcp#scale-with-mcp-tool-search) is disabled by default. Set `ENABLE_TOOL_SEARCH=true` if your proxy forwards `tool_reference` blocks. As of v2.1.196, [Remote Control](\/docs\/en\/remote-control#requirements) is disabled when this points at a host other than `api.anthropic.com`, matching its behavior on Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry"},{"name":"ANTHROPIC_BEDROCK_BASE_URL","slug":"anthropic-bedrock-base-url","description":"Override the Amazon Bedrock endpoint URL. Use for custom Amazon Bedrock endpoints or when routing through an [LLM gateway](\/docs\/en\/llm-gateway). See [Amazon Bedrock](\/docs\/en\/amazon-bedrock)"},{"name":"ANTHROPIC_BEDROCK_MANTLE_BASE_URL","slug":"anthropic-bedrock-mantle-base-url","description":"Override the Amazon Bedrock Mantle endpoint URL. See [Mantle endpoint](\/docs\/en\/amazon-bedrock#use-the-mantle-endpoint)"},{"name":"ANTHROPIC_BEDROCK_REGION_PREFIX","slug":"anthropic-bedrock-region-prefix","description":"Cross-region inference profile prefix (`us`, `eu`, `apac`, `jp`, `au`, or `global`) Claude Code tries first instead of the one derived from the AWS region. Ignored in AWS GovCloud regions. Requires Claude Code v2.1.224 or later. See [Amazon Bedrock](\/docs\/en\/amazon-bedrock#cross-region-inference-profile-prefixes)"},{"name":"ANTHROPIC_BEDROCK_SERVICE_TIER","slug":"anthropic-bedrock-service-tier","description":"Amazon Bedrock [service tier](https:\/\/docs.aws.amazon.com\/bedrock\/latest\/userguide\/service-tiers-inference.html) (`default`, `flex`, or `priority`). Sent as the `X-Amzn-Bedrock-Service-Tier` header. See [Amazon Bedrock](\/docs\/en\/amazon-bedrock#service-tiers)"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/env\/anthropic-webhook-signing-key","family_url":"https:\/\/changelogs.core-directive.com\/reference\/env.json"}