Practical guides to AI APIs and developer tooling

Error references you can actually fix a bug with, honest comparisons, and free browser-based tools. Every figure here is read from the provider’s own documentation and carries the date it was verified. No hype, no filler, no rewritten press releases.

Start with the LLM API error reference if something is failing right now, the API cost calculator if you are trying to predict a bill, or the context budget planner if your conversations keep breaking.

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Tool Call Limits: pause_turn, max_tokens and Context Ceilings
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Tool Call Limits: pause_turn, max_tokens and Context Ceilings

Strict Schema Mode Rejected My Tool Definition
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Strict Schema Mode Rejected My Tool Definition

Parallel Tool Calls and How They Fail
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Parallel Tool Calls and How They Fail

Tool-Use Loops: Why the Model Keeps Calling the Same Tool
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Tool-Use Loops: Why the Model Keeps Calling the Same Tool

The Model Ignored the Tool and Answered in Prose
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The Model Ignored the Tool and Answered in Prose

The Model Called the Wrong Tool: Why It Happens and How to Fix It
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The Model Called the Wrong Tool: Why It Happens and How to Fix It

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