Context limits aren’t vibes—they’re math. Learn truncation behavior, token budgets, and RAG chunking so your model stops forgetting the important part.

Complete Part 3 toolkit (includes Part 2 count/metrics/heatmap/generate plus prompt budgets). Put all five files in the same folder so relative imports resolve—no Part 2 download required.

Assemble prompts under token budgets with truncation/summarize policies.

Prompt Budget Module (promptBudget.mjs)

Full CLI: count, metrics, heatmap, generate, and build (prompt budgets).

Token Inspector CLI (token-inspector.mjs)

Helpers for build notes/out create-or-overwrite prompts (--yes / TTY).

Build IO helpers (token-inspector-build-io.mjs)

Full playground: tokenizer UI, /generate, plus /budget meter and assembler.

Tokenizer Playground + Budget meter

Starter budgets and per-item summarize/head-tail preferences.

Example truncation policy (truncation-policy.json)

📥 Download the runnable code

Context Is a Budget: Truncation, Chunking, Limits That Work

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Context Is a Budget: Truncation, Chunking, and Staying Under the Limit

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Articles published in July 2026 on MethodicalFunction.

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Context Is a Budget: Truncation, Chunking, and Staying Under the Limit