mcp-connector changedmanaged-agents/mcp-connector
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291291
292292When starting a session, pass `vault_ids` to provide credentials for your MCP servers. Vaults are collections of credentials that you register once and reference by ID. See [Authenticate with vaults](https://platform.claude.com/docs/en/managed-agents/vaults) for how to create vaults and manage credentials.
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294A `limited` [environment](https://platform.claude.com/docs/en/managed-agents/environments#networking) blocks an agent's MCP servers unless its networking sets `allow_mcp_servers: true` or lists each server's host in `allowed_hosts`. With neither set, session creation fails with a 400 error.
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294296<CodeGroup>
295297 ```bash cURL
296298 session_response=$(curl -sS --fail-with-body https://api.anthropic.com/v1/sessions \
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