Product design question

Different customers keep rebuilding similar skills and integrations with slight variations. How would you define the packaging model for reusable agent capabilities: what belongs in a package versus the core builder, how customization and overrides should work, and how you would prevent a fragmented ecosystem while still enabling meaningful reuse?

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What this question tests

Ability to design a platform packaging and extensibility model that balances reuse with the flexibility customers need.

Identify what is truly common across customer implementations versus what varies, for example the underlying integration logic to a common system type is shared, while business rules on top of it differ per customer.
Define what belongs in a package: the reusable core logic and integration plumbing that would otherwise be rebuilt identically by every customer.
Define what stays in the core builder: customer specific configuration and business rules that are expected to vary, exposed as parameters or overrides on top of the package rather than forked code.
Design the override mechanism so customization happens through defined extension points, not by forking the underlying package, which is what causes fragmentation over time.
Version packages so updates to the shared logic can propagate to customers who have not heavily customized, while customers with overrides are warned about compatibility before an automatic update.
Prevent fragmentation by curating which packages are officially supported and by monitoring how often customers are forced to fork rather than override, using that as a signal to expand the package's configurability.

Draws a clear line between shared package logic and customer specific configuration, rather than leaving the split ambiguous.
Uses defined extension points and overrides instead of allowing forking, which directly prevents the fragmentation the question warns about.
Addresses versioning and update propagation, a real operational concern for a package based system.
Proposes a concrete signal, fork rate, to catch when the package model is too rigid and needs to expand.

Allowing customers to freely fork packages, which recreates the exact fragmentation problem the question describes.
Not addressing how package updates propagate to customers who have customized on top of them.

How would you handle a customer whose override needs conflict with an upcoming package update?
What would tell you a piece of core builder logic should be promoted into a shared package?