LangSmith Fleet changelog

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New features

• The Access Profiles dialog in chat now includes a Create an access profile link that opens the sandboxes create flow, so you can add a profile when a workspace has none configured instead of hitting a dead end.
• Fleet agents can now delete files from their memory and skills using the new delete tool, including files in linked workspace skills. Core agent files and read-only system skills remain protected.
• Fleet now completes OAuth for MCP servers whose authorization server requires client-secret authentication at the token endpoint, so connecting these servers no longer fails after the consent step.
• First-time Fleet users now see a streamlined welcome modal with two clear paths — describe an agent to build with AI (starting from a prompt in Chat) or start from a curated template — replacing the previous multi-step setup wizard.
• Creating an agent from a Fleet template now skips the setup wizard and opens the agent editor with the template onboarding card.
• Fleet now sends the MCP protocol version a server negotiates during the handshake, both when loading tools and when the agent calls them, so MCP servers that require a newer version no longer return zero tools or fail tool calls.
• Fleet agents receive the day of week alongside the current date (for example “Monday, June 29th 2026”), so scheduling and date reasoning no longer relies on the model inferring the weekday from the ISO date.
• File edits in Fleet agent chat now render as syntax-highlighted, line-by-line diffs, making changes easier to review.
• When you connect a custom Slack bot to a Fleet agent, Fleet sends the installer a direct message with quick setup tips, including how to add the bot to channels and mention it with @.
• Fleet agents now have a Slack tool for listing channels the connected bot is a member of, making it easier to discover the right channel before posting or reading messages.
• Fleet OAuth provider and integration responses now include an owner field (workspace or platform) so you can tell your own resources apart from built-in, platform-managed ones. The platform manager organization can now create and modify built-in OAuth providers.
• Setting up a schedule is now clearer: choose a preset (daily, weekly, monthly, or every few minutes) or enter a custom cron expression, with a live human-readable preview and inline validation as you go.
• When registering an integration OAuth provider for headless connections, http:// redirect URIs are now accepted only for the loopback IP literals 127.0.0.1 or [::1]. The localhost hostname is no longer accepted over http — use the loopback IP literal or https.

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Fixes

• On the Agent Builder Integrations page, searching now selects the All tab so results span every category, and switching category tabs clears the search.
• When a Fleet agent’s subagent calls a tool that requires human approval, the approval prompt now appears in the chat instead of the run completing without it.

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New features

• Fleet tools now include Salesforce OAuth provider setup for self-hosted users, so you can configure the provider end to end.
• Agent sharing is redesigned around two choices, who can use and who can edit an agent, plus a Publish as template option that lets others fork their own editable copy.
• Fleet agents now post a notification to the originating thread, such as Slack, when they pause at a human-in-the-loop interrupt, with a link back to the agent chat.
• You can now complete Fleet integration OAuth through your own callback URL, so headless setups can finish authentication without the LangSmith UI.
• Agent cards now show the agent owner.
• New first-party templates, Brand Copywriter and Applicant Screening, are available in the gallery.

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Fixes

• Switching threads in the agent chat now clears the previous thread immediately and shows a loading state instead of stale messages.
• The skills list now degrades gracefully when one skill fails to load, so the remaining skills still appear.

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New features

• Templates now show “by Fleet” with the Fleet logo, so curated templates match Fleet branding.

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Fixes

• The Fleet list-threads endpoint now returns items instead of threads, so the response shape matches the rest of the API.
• Fleet thread requests now return a clearer error when a large response would have triggered a 5xx, so long lists fail gracefully.

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New features

• Skills load faster: the skills list fetches lightweight metadata first and loads file contents only when you open a skill.
• The agent creation menu adds a Templates entry.
• The remote MCP authorization screen now shows the connecting application’s name, logo, and homepage, terms, and privacy links instead of its raw client ID.
• Slack integration available in AWS and APAC regions.

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Fixes

• Scheduled (cron) execution is restored for enterprise Fleet agents.
• Long-running agent runs and agent-builder generations are no longer cut off after 60 seconds.
• The Gmail read-emails tool now returns results when you search sent mail with an in:sent query.
• Scrolling is improved for long toolbox, skill, and sub-agent lists in the agent editor, and webhook dialogs now scroll within the viewport.

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New features

• Agent Builder is now LangSmith Fleet. The new name reflects Fleet’s focus on building and managing agents for your whole team: creating them, sharing them, managing their tasks, and controlling agent access and identity. All existing agents, configurations, integrations, plans, and contracts continue to work unchanged, with no action required on your end.

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New features

• A central Chat agent connects to all of your workspace tools, including Slack, Gmail, Linear, and MCP servers, so you can ask questions and take actions without setting up a dedicated agent first.
• Turn a useful conversation into a recurring agent with one click, with no prompt engineering or conditional logic required.
• Upload files directly into chat, including CSVs, images, documents, and style guides, for the agent to act on immediately.
• A central tool registry lets workspace admins connect tools, manage authentication, and control access across the organization.

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New features

• LangSmith Agent Builder launched in private preview as a no-code way for non-developers to build agents, with conversational setup, built-in memory, MCP integrations, automated triggers, and subagent support. Agent Builder later became LangSmith Fleet.