`prompt.attachment`

setting never mined JSON

A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

New prompt.attachment hook lets plugins rewrite or remove text attached to a message

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.277.

First seen — never in a mined build

Last seen — never in a mined build

Builds0 / 159on this box, as of v2.1.319

Written about v2.1.277 first named in a changelog, 18 Sep 2026

In the changelogs

Releases whose published page names prompt.attachment.

v2.1.311 26 Oct 2026
Hooks runtime skips needless work, with two variables to turn this off
The hooks runtime now skips work when only default handlers apply; two environment variables switch the shortcuts off

found in this entry's text
v2.1.299 14 Oct 2026
Plugin hook modules get more events and organization policy limits
Plugin hook modules can respond to more events, while plugins people install themselves face limits where an organization manages Claude Code

found in this entry's text
v2.1.277 18 Sep 2026
New 'prompt.attachment' hook type lets plugins rewrite or drop message attachment text
New prompt.attachment hook lets plugins rewrite or remove text attached to a message

named in this entry, found in this entry's text
v2.1.277 18 Sep 2026
New plugin hook event: prompt.attachment
Plugins can now hook into 'prompt.attachment' to rewrite or drop attachment text before it reaches the model

named in this entry, found in this entry's text
v2.1.277 18 Sep 2026
New prompt.edit / prompt.attachment telemetry validation checks
New validation checks were added for prompt-edit and prompt-attachment telemetry replay data

found in this entry's text
v2.1.277 18 Sep 2026
callModel wrapper resolves prompt.attachment hooks before each model call
Model calls now resolve prompt.attachment hooks just before each call, if enabled

named in this entry, found in this entry's text
v2.1.277 18 Sep 2026
New prompt.attachment resolution wired into query pipeline via th()
Model calls now run a new prompt-attachment resolution step, still skippable via settingsHooksOff

named in this entry, found in this entry's text

First cited

The earliest release whose published evidence quoted prompt.attachment was v2.1.277, 18 Sep 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.

ReleaseDateThe span that was quoted

v2.1.27718 Sep 2026"prompt.attachment"

v2.1.27718 Sep 2026prompt.attachment

v2.1.27718 Sep 2026prompt.attachment ${a}:

Presence across releases

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

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 settings key does. All settings keys.

Names beside it

Every settings key in the inventory starting prompt, up to twelve of them.

prompt v2.1.315
Auto-mode is stricter: text you asked Claude to review can't grant permission on your behalf.
prompt.autocomplete never mined
A new prompt.autocomplete plugin hook lets plugins add completion rows under the prompt, including for desktop, mobile and VS Code composers
prompt.change never mined
The prompt.change hook runs when a plugin or the landing screen changes the prompt box, and stops itself if plugins keep refilling it
prompt.compose never mined
Claude Code can now compare two versions of a changing schema and label the difference, such as text only or new live additions
prompt.context never mined
A new prompt.context hook event lets plugins add named context blocks to a prompt, capped at 32 blocks and 32000 characters.
prompt.edit never mined
Plugins can now hook into 'prompt.attachment' to rewrite or drop attachment text before it reaches the model
prompt.fill never mined
Plugins can now fill in or suggest text directly in the prompt input box via two new prompt.fill and prompt.suggest actions
prompt.md never mined
plugin eval warns when writing results inside a plugin's own directory could get picked up as plugin components
prompt.paint never mined
A new plugin hook, prompt.paint, takes text and decorations and returns the text and cursor position to show in the prompt
prompt.read never mined
New plugin hook API lets plugins read the current text and cursor position in the prompt box
prompt.submit never mined
Hooks can now rewrite or drop your prompt before it is sent.
prompt.suggest never mined
Plugins can now fill in or suggest text directly in the prompt input box via two new prompt.fill and prompt.suggest actions

Documentation pages 2

Manage mods for your organizationmentions itClaude Code CLI
Mods referencementions itClaude Code CLI

A reference table page is one whose own table defines this name, and it is where the description above came from. A page that mentions it carries the name somewhere in its text and may say nothing about it at all. Every page carrying it.