Merge Agent Handler Tests MCP Reliability

The strongest point is the cost model: a failed tool call burns both execution budget and model attention. Merge’s abstraction is compelling if it measurably improves recovery and consistency—but this vendor-run, three-app comparison should be treated as a signal, not a universal reliability verdict.

• –Merge’s MCP layer exposes hundreds of integration tools through one server while centralizing rate limits, pagination, maintenance, and access control. [MCP docs](https://docs.merge.dev/merge-unified/specifications/model-context-protocol-mcp)
• –Agents should be evaluated on task success, recovery turns, latency, and tokens per completed task—not only whether `tools/list` or a health check passes.
• –Microsoft describes its app-specific Microsoft 365 MCP tools as backward-compatibility options rather than choices for new production projects. [Microsoft Learn](https://learn.microsoft.com/en-us/microsoft-agent-365/tooling-servers-overview)
• –The tradeoff is dependency concentration: managed connectors reduce integration work but add another gateway whose pricing, limits, permissions, and outage behavior require testing.