Marketplace versus custom build for a capability gap
Key Takeaway
Check AgentExchange before you build from scratch, because a custom build competes with your other priorities.
When an org needs a capability it does not have yet, an app builder can build it in Salesforce or look for an existing option on AgentExchange. AgentExchange is the official Salesforce marketplace for solutions, such as apps, agents, and components, and for consultants. Choosing well means deciding what kind of help you need, then checking your options against a strategy you define before browsing.
Check AgentExchange before building from scratch
AgentExchange now brings AppExchange, AgentExchange, and Slack Marketplace together into a single place where you can find and try solutions, then buy and deploy them. Because it is the official marketplace, the transparency and trust expected from Salesforce carry over to its listings.
If you are short on time...
An existing app or agent probably meets your need.
If you want to integrate a third-party system...
There is a good chance a solution for it is already available.
You can still build something yourself in Salesforce, but that work competes with your other priorities. That is why a custom build often becomes the backup option when a marketplace solution could do the job.