Besides the other reply here (good info), there's also complexity. Determining if you've "completed" the work - they want specified results, which you probably

Besides the other reply here (good info), there's also complexity. Determining if you've "completed" the work - they want specified results, which you probably want to negotiate on - that's far more nuanced than "I showed up at this club and did my 2 hour set". There are tech recruiters that will do short term contract/placements, which may be close, but they're not an 'agent' in the same way as a music/actor/sports agent might be, who may know you for years and understand your career/strengths/skills/etc. The tech recruiter will still more be a body-shop sort of thing.