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fix(session): warn when context window may be too small for tool calling #7422

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fix(session): warn when context window may be too small for tool calling #7422

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536436f
wip: zen
fwang Jan 9, 2026
5805a76
fix(session): warn when context window may be too small for tool calling
zerone0x Jan 9, 2026
859c17f
fix(tui): remove invalid stopPropagation call on KeyEvent
zerone0x Jan 9, 2026
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1 change: 0 additions & 1 deletion packages/opencode/src/cli/cmd/tui/ui/dialog.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,6 @@ function init() {
current.onClose?.()
setStore("stack", store.stack.slice(0, -1))
evt.preventDefault()
evt.stopPropagation()
refocus()
}
})
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13 changes: 13 additions & 0 deletions packages/opencode/src/session/llm.ts
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Expand Up @@ -121,6 +121,19 @@ export namespace LLM {

const tools = await resolveTools(input)

// Warn about potential context window issues for local models with tools
// See: https://github.com/anomalyco/opencode/issues/7185
const MINIMUM_CONTEXT_FOR_TOOLS = 16_384
const toolCount = Object.keys(tools).filter((x) => x !== "invalid").length
if (toolCount > 0 && input.model.limit.context > 0 && input.model.limit.context < MINIMUM_CONTEXT_FOR_TOOLS) {
l.warn("low context window for tool calling", {
contextLimit: input.model.limit.context,
minimumRecommended: MINIMUM_CONTEXT_FOR_TOOLS,
toolCount,
hint: "Tool calling may fail with context windows below 16K tokens. For vLLM/Ollama, increase max-model-len or num_ctx.",
})
}

return streamText({
onError(error) {
l.error("stream error", {
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