AI Guides › Claude Mastery
What Goes Wrong When You Paste In Everything At Once
By Nigel Guy · 2 min read
Faced with a long document, a messy thread, or a pile of notes, the instinct
is to paste the whole thing in and ask one big question at the end — "can
you summarise this" or "what should I do about this." It feels efficient:
one message, everything included. What actually happens is that the answer
ends up flattened — it treats the whole pile as roughly equally important,
because you haven't told it otherwise, and the thing you actually needed can
end up buried under the parts you didn't.
The rule: a single giant paste asks Claude to guess what matters in your
input; chunking the input by purpose tells it, which is the difference
between a flattened summary and a useful one.
The mechanism: chunking by purpose
Instead of one paste and one question, split the job:
- Separate the input from the instruction. Paste the material first,
clearly marked as source material, then state — separately — exactly
what you want done with it. Don't bury the actual ask at the bottom of
three thousand words.
- Chunk by section, not by size. If the document has natural
divisions — background, decision, action items; or thread-by-thread in a
long email chain — process a chunk at a time and ask for what matters in
that chunk specifically, rather than one instruction across
everything.
- Tell it what to weight, if you know. "The action items matter more
than the background" is one sentence that does more work than pasting in
more context and hoping the weighting emerges on its own.
- Ask for a structured output per chunk, then synthesise. Get a short,
consistent summary of each part first — then ask for the pulled-together
view across all of them. This catches things a single-pass summary of the
whole thing tends to smooth over.
- For something too long to fit at all, chunk deliberately rather than
truncating by accident. Decide what to leave out on purpose, rather
than letting the input simply get cut at whatever limit you hit.
What to skip
Skip chunking a short document — a page or two doesn't need this treatment,
paste it and ask directly. And skip over-engineering the split on a first
pass; two or three sensible chunks beat ten precisely-labelled ones for most
real documents.
Guardrails
- Chunking improves what gets weighted and noticed; it doesn't guarantee
nothing important gets missed, especially in genuinely disorganised source
material.
- If you split a document into chunks that lose important connections
between them (a decision in section one that only makes sense with context
from section four), say so explicitly — don't assume the connection
survives the split on its own.
- For anything you'll rely on — a contract, a legal thread, a financial
document — read the actual source yourself as well. A chunked summary is a
navigation aid, not a substitute for reading the material that matters.
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