Amp's Librarian Gets 3x Faster, Plugins Can Now Spawn Agents, and Diffs Are Built In

Amp shipped three updates in the span of four days this week. The Librarian, the codebase search subagent that handles research tasks, got significantly faster and cheaper. Plugins gained the ability to create their own sub-agents. And diff review landed as a built-in feature.

The Librarian Is 3x Faster and 43% Cheaper

The Librarian is the subagent Amp uses when you ask it to investigate a codebase: tracing how a feature works, finding where a bug originates, checking which services expose a particular API. On large codebases, this search step was the slowest part of most Amp sessions.

The June 18 update cuts Librarian latency by roughly two-thirds and reduces the cost per run by 43%. The specifics of how this was achieved weren’t detailed publicly, but the practical effect is that deep research prompts that previously had noticeable wait times now feel closer to inline completion.

Plugins Can Now Create Agents

The June 19 update gives plugins the ability to create agents, run them for a single task, and then continue talking to their threads after the task completes.

Previously, plugins could use Amp’s main agent but couldn’t spawn their own. This change lets a plugin kick off a focused sub-agent for a specific job and get back a result without blocking the main session. The sub-agent’s thread persists, so you can inspect what it did or continue a conversation with it after the plugin finishes.

The practical application depends on what plugins you’re using, but for anything that involves research or multi-step actions, this means less waiting and more parallel work.

Diff Review in the App

The June 16 update added a Diffs view inside Amp. You can now review the changes an agent made and stage them for commit without switching to a terminal or opening a separate git client.

This closes a context-switch that affected most Amp workflows. Previously, after an agent finished, you’d move to the terminal or VS Code to check the diff and stage what you wanted. That step is now in the same interface where you gave the instruction.

Sources: Amp changelog — June 16-19, 2026