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keep 2 most recent images, age out the rest

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age_out_images now keeps 1 existing image + 1 about to be added
= 2 live images for motion/comparison. Previously aged all to 1.
Reduces image bloat in conversation log and context.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>
This commit is contained in:
Kent Overstreet 2026-04-02 23:06:08 -04:00
parent 3f3db9ce26
commit 41b3f50c91
1 changed files with 19 additions and 18 deletions
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37
src/agent/runner.rs
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@ -897,33 +897,34 @@ impl Agent {
}
/// Replace base64 image data in older messages with text placeholders.
/// Only the most recent image stays live — each new image ages out
/// all previous ones. The tool result message (right before each image
/// message) already records what was loaded, so no info is lost.
/// Keeps the 2 most recent images live (enough for motion/comparison).
/// The tool result message before each image records what was loaded.
fn age_out_images(&mut self) {
for entry in &mut self.context.entries {
let msg = entry.message_mut();
// Find image entries newest-first, skip 1 (caller is about to add another)
let to_age: Vec<usize> = self.context.entries.iter().enumerate()
.rev()
.filter(|(_, e)| {
if let Some(MessageContent::Parts(parts)) = &e.message().content {
parts.iter().any(|p| matches!(p, ContentPart::ImageUrl { .. }))
} else { false }
})
.map(|(i, _)| i)
.skip(1) // keep 1 existing + 1 about to be added = 2 live
.collect();
for i in to_age {
let msg = self.context.entries[i].message_mut();
if let Some(MessageContent::Parts(parts)) = &msg.content {
let has_images = parts.iter().any(|p| matches!(p, ContentPart::ImageUrl { .. }));
if !has_images {
continue;
}
let mut replacement = String::new();
for part in parts {
match part {
ContentPart::Text { text } => {
if !replacement.is_empty() {
replacement.push('\n');
}
if !replacement.is_empty() { replacement.push('\n'); }
replacement.push_str(text);
}
ContentPart::ImageUrl { .. } => {
if !replacement.is_empty() {
replacement.push('\n');
}
replacement.push_str(
"[image aged out — see tool result above for details]",
);
if !replacement.is_empty() { replacement.push('\n'); }
replacement.push_str("[image aged out]");
}
}
}