Claude's long context and disciplined tool use make it a strong fit for account research, where you often want twenty companies compared in one pass rather than one company summarised.
Tool use, not pasting
Define tools with JSON schemas and let Claude call them in a loop. Pasting a spreadsheet into the prompt works once; a tool works every day and stays current.
Claude connects cleanly over MCP, so the same server you built for other clients works here without extra code.
Patterns that work with long context
Batch comparisons: fetch twenty resolved records, then ask for a ranked shortlist with the criteria stated. Because everything sits in one context, the ranking is consistent instead of drifting between calls.
Ask for a table with a source column. Requiring a source per row suppresses invented fields more effectively than any instruction about honesty.
Where it still goes wrong
Ambiguous names across markets remain the main failure mode. Always pass a country and require resolution before enrichment.
Financial fields differ per register. Tell the model which markets file accounts and which do not, so it does not treat a missing figure as zero.
Frequently asked questions
Does Claude support MCP out of the box?
Yes, Claude was the first major client to adopt MCP, so an MCP server for company data can be attached without building a bespoke plugin.
How many companies can I compare at once?
With compact records, dozens comfortably. Keep payloads lean — drop unused fields and long free text before sending them into context.
