Unverified50% confidenceFactExact time
T3 Code does not add new tools to the Harness, but instead lets the Agent access data and systems outside the Harness via MCP, such as Supabase and PostHog.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/30/2026
First Seen
Valid until: 1/28/2027
Sources
Is Harness Dead? Why the Creator of T3 Code Says Stop Obsessing Over AI Coding Tools
youtubeTheo - t3․gg10/30/2026
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UnverifiedT3 Code's MCP layer allows one Harness to control another Harness, for example using Claude Code to launch a sub-Agent that uses another model.78% similarUnverifiedT3 Code's orchestration layer is implemented as a flexible MCP, allowing agents to communicate with each other, manage other threads, and be controlled remotely via external tools (such as an iMessage bot).72% similarVerifiedIn an MCP Server, a Tool is the smallest capability unit exposed for upper-level Agent invocation, and the tutorial uses a decorator approach for tool declaration68% similarUnverifiedMCP Server uses two annotations, @Tool and @ToolParam, to declare tool capabilities: @Tool is annotated on methods and @ToolParam is annotated on parameters.66% similarVerifiedMCP servers add tool definitions to the context window even when the user is not using those tools.66% similar
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