Claude API

Building with the Claude API: prompt caching, batches, tool use, errors, cost control. · 11 articles

Claude API4 min read

Tool Search, Programmatic Tool Calling, Tool Use Examples: cut tokens for tool-heavy agents

Three Claude API beta features: load tools on demand, let code call tools and filter data, teach usage by example. How to enable and when.

Claude API4 min read

clear_tool_uses and clear_thinking strategies, trigger/keep/clear_at_least parameters, prompt caching interaction and the memory tool.

Claude API4 min read

Automatic vs explicit breakpoints, write/read pricing, 5-minute and 1-hour TTLs, what invalidates the cache and why caches never hit.

Claude API4 min read

Manual extended thinking is rejected from Claude 4.7 on. How to migrate to adaptive thinking, pick an effort level and avoid cost traps.

Claude API4 min read

Which errors to retry, how RPM/ITPM/OTPM work, why cache reads don't count toward ITPM, and the spend-cap 429 trap.

Claude API5 min read

Groups often advertise Claude keys/endpoints at 50–80% off. Before plugging one into a project, understand the data, model-quality and terms risks.

Claude API5 min read

Classify 10,000 tickets, summarize a document archive, run evals… submit once as a batch, collect later, pay half.

Claude API4 min read

Same models, two completely different billing models. Pick wrong and you either overpay or hit limits right when you need them.

Claude API5 min read

Keys leaked on GitHub or in client-side JavaScript get scraped and abused within minutes. A short checklist to avoid being the victim.

Claude API5 min read

“Only return JSON” prompts still leak prose sometimes. Define a schema as a tool and force the call — clean, parseable data.

Claude API4 min read

The same agent loop, tools, permissions and hooks as Claude Code — called from your code, with custom tools written in Python.

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