Hire Claude Agent SDK developers who build the boundary first

The Claude Agent SDK is Anthropic's toolkit for agents that run a loop: the model plans, calls a tool, reads the result and continues until the work is done or a limit stops it. It gives you the loop, the tool handling and the context management, so you do not write that scaffolding. You still own which tools exist, what they may touch, and where the agent runs.

A fixed workflow is better whenever the steps are known in advance, because it is cheaper, faster and easier to test. An agent earns its cost when the path genuinely varies with the input and writing every branch is impractical. We will talk you out of an agent on the call if that is the honest answer.

Ceilings set in code: a maximum number of steps, a spend limit per task, and cheaper models for the simple stages. Costs are tracked per task rather than as one monthly total, so an expensive pattern is visible in days instead of at the end of the quarter.

Yes, and that is normally the whole reason to build one. Tools run inside your network or cloud account, so the agent reaches your systems through code you own rather than through direct database access. Go4Gr8 works this way inside a multi-tenant boundary.

You run an evaluation set against the new version before it goes live, checking the agent still picks the right tool with the right arguments on cases you care about. Model versions are retired on a published schedule, so this is planned work rather than an emergency.

The number of tools, the systems behind them, and how reversible the actions are. An agent that only reads is straightforward. One that moves money or changes customer records needs approval steps, logging and far more testing. Scoping calls are free. Every build starts with a fixed-fee Blueprint: an engineer reads your real systems and writes the plan, with a fixed price for each milestone rather than a guess. The fee is credited in full against the build, and if the plan isn't one you'd act on, you don't pay for it.

A freelancer can wire up tool calls. Harder to find is someone who has argued a permission boundary through review on a multi-tenant product, where a mistake reaches another customer's data. Our engineers embed in your repository and your process instead of working from a brief. You interview them before either side commits.

You do, from the first commit. Tool definitions, permission logic, stopping conditions and the evaluation set live in your repository, not ours. Someone on your team is trained to change them before we hand over.

We set working hours to match meaningful overlap with your team, agreed before the engineer starts rather than defaulted to ours. Daily standups and code review happen in the hours you both keep, not asynchronously across a full day's gap.