Compaction in the Claude API: let Claude summarise as long agents run
Server-side compaction at a token threshold or on demand: parameters, the compaction block, counting usage.iterations, prompt caching and risks.
Claude API
Building with the Claude API: prompt caching, batches, tool use, errors, cost control. · 16 articles
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Claude Code
Claude API
LLM & NLP
AI Agents & Skills
Tips
AI Automation
Tools
System Design
Reading
Using Agent Skills via the Claude API: Office files, PDFs and your own skills
Attaching skills in the Messages API: code execution tool, container.skills, pre-built pptx/xlsx/docx/pdf skills, /v1/skills uploads, output files.
Streaming with the Claude API: SSE, event types and mid-stream errors
Enabling streaming, SDK helpers, the SSE event order, delta types (text, tool JSON, thinking) and handling overloaded errors mid-stream.
Citations in the Claude API: verbatim, precisely located and cheaper
Enabling citations for text, PDF and custom documents: citation formats, token costs, versus prompt-based citations, and the structured outputs limitation.
The Claude API web search tool: fresh data with citations, and what it costs
Server-side web search: tool versions, dynamic filtering, max_uses, domain filters, $10 per 1,000 searches, errors and injection risk.
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.
Context editing on the Claude API: auto-clear old tool results so long agents stay cheap
clear_tool_uses and clear_thinking strategies, trigger/keep/clear_at_least parameters, prompt caching interaction and the memory tool.
Prompt caching on the Claude API: up to 90% off repeated input
Automatic vs explicit breakpoints, write/read pricing, 5-minute and 1-hour TTLs, what invalidates the cache and why caches never hit.
From budget_tokens to adaptive thinking + effort on the Claude API
Manual extended thinking is rejected from Claude 4.7 on. How to migrate to adaptive thinking, pick an effort level and avoid cost traps.
Handling Claude API errors: 429, 529, spend caps and rate limits
Which errors to retry, how RPM/ITPM/OTPM work, why cache reads don't count toward ITPM, and the spend-cap 429 trap.
“Cheap” Claude API via third-party proxies: cheap, but what are you really paying with?
Groups often advertise Claude keys/endpoints at 50–80% off. Before plugging one into a project, understand the data, model-quality and terms risks.
Message Batches API: cut Claude costs by 50% for work that can wait
Classify 10,000 tickets, summarize a document archive, run evals… submit once as a batch, collect later, pay half.
Pro/Max plan or pay-as-you-go API? Picking the right way to pay for Claude
Same models, two completely different billing models. Pick wrong and you either overpay or hit limits right when you need them.
Protecting API keys in AI apps: 7 mistakes that blow up your bill overnight
Keys leaked on GitHub or in client-side JavaScript get scraped and abused within minutes. A short checklist to avoid being the victim.
Make Claude return schema-valid JSON: use tool use instead of “please return JSON”
“Only return JSON” prompts still leak prose sometimes. Define a schema as a tool and force the call — clean, parseable data.
Claude Agent SDK (Python): build your own agent on Claude Code's engine
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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