Direct answer
DevTool GTM with GitHub signals means using public developer activity to prioritize accounts, identify relevant pain, and create outreach that reflects real technical context rather than generic firmographic data.
Signals worth watching
Useful signals include repository creation, dependency usage, stars, forks, issues, pull requests, contributor activity, migration patterns, and recurring pain in public discussions.
The product opportunity
A GitHub signal workflow can become more than research. It can become a SaaS product, GTM data layer, sales assistant, or internal prioritization system when the workflow is repeatable and tied to revenue.