From 6bd7b39f6f53dd8f3743347a1cb72c2f74424dd8 Mon Sep 17 00:00:00 2001
From: Adam Malczewski <github@tradam.dev>
Date: Fri, 12 Jun 2026 01:01:32 +0900
Subject: feat(metrics): consume contextSize — current context-usage readout
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Backend context-size handoff: re-pin wire@0.5.0 / transport-contract@0.6.0
(+ re-mirror .dispatch reference snapshots). Thread the optional contextSize
through core/metrics (done fold + durable + selectCurrentContextSize: latest
turn's defined value, undefined=>unknown never 0, durable-wins-over-live).
Chat store exposes currentContextSize; ContextSizeBadge renders
"N tokens in context" / "context size unknown" above the composer.
GLOSSARY: add context size / context window. 533 tests green.
---
 src/features/chat/ui/ContextSizeBadge.svelte | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 src/features/chat/ui/ContextSizeBadge.svelte

(limited to 'src/features/chat/ui')

diff --git a/src/features/chat/ui/ContextSizeBadge.svelte b/src/features/chat/ui/ContextSizeBadge.svelte
new file mode 100644
index 0000000..475d54f
--- /dev/null
+++ b/src/features/chat/ui/ContextSizeBadge.svelte
@@ -0,0 +1,20 @@
+<script lang="ts">
+	import { formatContextSize } from "../../../core/metrics";
+
+	let {
+		contextSize,
+	}: {
+		// The conversation's current context size (tokens occupied), or `undefined`
+		// ("unknown") when no finalized turn has reported one yet. Never `0` for the
+		// unknown case — `formatContextSize` renders a placeholder instead.
+		contextSize: number | undefined;
+	} = $props();
+
+	const label = $derived(formatContextSize(contextSize));
+</script>
+
+<div class="px-4 pb-1 text-xs opacity-60" aria-live="polite">
+	<span title="The model's max context window is not reported yet — current usage only.">
+		{label}
+	</span>
+</div>
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