CLAUDE_CODE_FILE_READ_MAX_PDF_PAGES_PER_MESSAGE
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.300, including the newest one read.
Once the context has filled up, PDF reads can be capped per message and per turn using two new environment variables
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.300.
In the changelogs
2Releases whose published page names CLAUDE_CODE_FILE_READ_MAX_PDF_PAGES_PER_MESSAGE.
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v2.1.300
Limits on how many PDF pages can be read per message and per turn
Once the context has filled up, PDF reads can be capped per message and per turn using two new environment variables
found in this entry's text
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v2.1.300
PDF reading can be capped once the conversation has filled up
Two new environment variables can limit how many PDF pages Claude reads per message and per turn after the context has filled once
found in this entry's text
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_FILE_READ_MAX_PDF_PAGES_PER_MESSAGE was v2.1.300, 14 Oct 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Presence across releases
1Build by build
9One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the environment variable does. All environment variables.