Kong today unveiled the latest release of its open source platform for designing, mocking, debugging, and testing APIs. Insomnia 12 adds new features to enable developers to more rapidly build and test APIs and MCP servers.
According to Kong, developers who are building MCP servers are facing similar challenges to what API developers faced years ago, and which has now been solved: validating and testing what they are building quickly, reliably, and without needing complex setups. The latest release of Insomnia aims to bring MCP developers a test-iterate-debug workflow for AI development so they can quickly develop and validate their work on MCP servers.
Developers will now be able to connect directly to their MCP servers, manually invoke tools with custom parameters, inspect protocol-level and authentication messages, and see responses.
Insomnia 12 also adds support for generating mock servers from OpenAPI spec documents, JSON samples, or a URL. “What used to require hours of manual set up, like defining endpoints or crafting realistic responses, now happens almost instantaneously with AI. Mock servers can now transform from a ‘nice to have if you have the time to set them up’ into an essential part of a developer’s workflow, allowing you to test faster without manual overhead,” Kong wrote in a blog post.
Additionally, Insomnia now uses AI to analyze diffs and history to group files logically and generate descriptive commit messages.
To give developers more control over how they use AI in Insomnia, Kong is offering options to disable AI features on a per account or per user basis and use either cloud-based or local LLMs.
The latest version of Insomnia also extends support for Git Sync to up to three users for free on the Essentials plan. Git Sync facilitates version control and cross-machine syncing, which the company says enables better team collaboration.
“Whether you’re a start up developer scaling your API infrastructure or a small team building your first integration, you can now work together with the same collaboration tools larger orgs rely on, without the price tag,” the company wrote.
