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“Agent Process Exited” immediately after sending a message

This typically means the agent (Claude, Codex) crashed on startup. Common causes:

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1. Network restrictions

The sandbox cannot reach the AI provider’s API (api.anthropic.com or api.openai.com). Test connectivity with: 
curl -s -o /dev/null -w '%{http_code}' --connect-timeout 5 https://api.anthropic.com/v1/messages
A 000 or timeout means the network is blocked. See Daytona Network Restrictions below.

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2. Missing API key

Ensure ANTHROPIC_API_KEY or OPENAI_API_KEY is set in the sandbox environment, not just locally.

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3. Agent binary not found

Verify the agent is installed: 
ls -la ~/.local/share/sandbox-agent/bin/

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Daytona Network Restrictions

Daytona sandboxes have tier-based network access:
TierNetwork Access
Tier 1 & 2Restricted. Cannot be overridden. AI provider APIs blocked by default.
Tier 3 & 4Full internet access. Custom allowlists supported.
If you’re on Tier 1/2 and agents fail immediately, you have two options:
  1. Upgrade to Tier 3+ for full network access
  2. Contact Daytona support to whitelist api.anthropic.com and api.openai.com for your organization
The networkAllowList parameter only works on Tier 3+: 
await daytona.create({
  snapshot: "my-snapshot",
  envVars: { ANTHROPIC_API_KEY: "..." },
  networkAllowList: "api.anthropic.com,api.openai.com", // Tier 3+ only
});
See Daytona Network Limits documentation for details.