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Why large codebases are hard to understand
The difficulty is often in relationships, boundaries and historical decisions rather than the number of files.
Read articleThe checkout entry point reaches a service, its payment and order dependencies, a validation contract and a test. Lines illustrate static relationships, not runtime execution.
Entry pointcheckout.test.ts
01Checkout servicecheckout-service.ts
02Payment gatewaypayment-gateway.ts
03Order moduleorder-service.ts
04Validation contractvalidation.ts
05Related checkscheckout.test.ts
06Selected module · Static relationships · Supporting checks
checkout-service.tsImports these modules
01payment-gateway.tsPayment adapter
02order-service.tsOrder model
03Code understanding
Beyond file search: asking questions about structure
Search locates text; structural exploration helps explain how the results participate in a system.
Read articleTaskA focused question
01Relevant codeSource + relationships
02Context packageBounded review material
03Agentic engineering
Why agents need structural context
Relevant code includes the relationships that constrain a change, not only the file an agent is editing.
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