docs(deepagents): add E2B dcode sandbox docs

[Vladislav Sokolovskii (vsokolovskii)]

Overview

Adds E2B to the Deep Agents Code remote sandbox docs now that dcode --sandbox e2b is discoverable through the langchain-e2b provider package.

This updates the existing Deep Agents Code overview and remote sandbox pages to document:

• installing langchain-e2b with dcode --install langchain-e2b --package
• setting E2B_API_KEY
• running dcode --sandbox e2b
• E2B's /home/user sandbox working directory
• E2B as a third-party sandbox provider discovered through the sandbox provider entry point

Type of change

Type: Update existing documentation

Related issues/PRs

• GitHub issue: Support dcode --sandbox e2b: ship a SandboxProvider + entry point e2b-dev/langchain-e2b#3
• Feature PR: feat(e2b): add dcode sandbox provider e2b-dev/langchain-e2b#4

Checklist

• I have read the contributing guidelines, including the language policy
• I have tested my changes locally using docs dev
• All code examples have been tested and work correctly
• I have used root relative paths for internal links
• I have updated navigation in src/docs.json if needed

Additional notes

No src/docs.json update is needed because this only updates existing pages.

Local verification included prose linting and a Mintlify preview click-through from the overview page to the remote sandboxes page. Mintlify was run with Node 24 because the local default Node 26 is unsupported by Mintlify.

[github-actions]

Thanks for opening a docs PR, Vladislav Sokolovskii (@vsokolovskii)! When it's ready for review, please add the relevant reviewers:

• @mdrxy (Deep Agents)

[Mason Daugherty (mdrxy)]

Thanks for putting this together. I’m going to close this as superseded by #4521, which has already merged and documents the core E2B Deep Agents Code flow: installing langchain-e2b, setting credentials, running dcode --sandbox e2b, the E2B working directory, and the relevant env-var overrides.

There may still be a few smaller follow-up improvements worth making separately, such as adding e2b to the CLI overview table or documenting minimum supported versions if we want that called out. If you’d like to open a narrower PR for those remaining deltas, happy to review.