feat(harness-deepagents): implement harness adapter for Deep Agents

[mlekhi]

Background

DeepAgents is a TS agent runtime. This is the harness adapter for DeepAgents - @ai-sdk/harness-deepagents. Runs the deepagents package through a Node bridge in the sandbox.

• Built-in tools: read, write, edit, bash, grep, glob, ls, task, write_todos
• Host tools work
• Skills work
• Auth: Anthropic, OpenAI, Gateway
• Multi-turn, attach, resume
• Built-in tool approvals (approve/reject) via DeepAgents interruptOn

Manual Verification

Ran the examples for real (model + sandbox):

• examples/ai-functions/src/harness-agent/deepagents/* — all worked
• Approvals: approve → tool runs; reject → tool doesn't run, returns "Rejected by user."
• TUI + Next apps: all variants worked
• 45 unit tests pass

Checklist

• All commits are signed
• Tests added
• Docs added
• Changeset added
• Self-reviewed

[felixarntz]

@mlekhi this works great based on initial testing! the main thing to look into further is proper skills setup, and then some minor fixes around tools. also worth checking whether we can support tool approvals at least for custom tools (like e.g. for Codex).

[github-actions]

🚀 Published in:

Package	Version
ai	7.0.1 github npm
@ai-sdk/angular	3.0.1 github npm
@ai-sdk/gateway	4.0.1 github npm
@ai-sdk/harness	1.0.1 github npm
@ai-sdk/harness-claude-code	1.0.1 github npm
@ai-sdk/harness-codex	1.0.1 github npm
@ai-sdk/harness-deepagents	1.0.0 github npm
@ai-sdk/harness-opencode	1.0.1 github npm
@ai-sdk/harness-pi	1.0.1 github npm
@ai-sdk/langchain	3.0.1 github npm
@ai-sdk/llamaindex	3.0.1 github npm
@ai-sdk/otel	1.0.1 github npm
@ai-sdk/policy-opa	1.0.1 github npm
@ai-sdk/react	4.0.1 github npm
@ai-sdk/rsc	3.0.1 github npm
@ai-sdk/sandbox-just-bash	1.0.1 github npm
@ai-sdk/sandbox-vercel	1.0.1 github npm
@ai-sdk/svelte	5.0.1 github npm
@ai-sdk/tui	1.0.1 github npm
@ai-sdk/vue	4.0.1 github npm
@ai-sdk/workflow	1.0.1 github npm
@ai-sdk/workflow-harness	1.0.1 github npm