Dynamically inject tools based on which env variables are set

[slimeonmyhead]

Is your feature request related to a problem? Please describe.
Some developers who begin working on additional features might not want to sign up for all the integrations.
As we grow in number of integrations, it will become more of an annoyance for a new developer to setup a local instance

Describe the solution you'd like
Allow a dev to opt-out of a tool by omitting the environment variable.
Have a clear section of what environment variables are required and which are optional
Each tool that has a dependency on some environment variable should check if they are set before being injected into the agent tools