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fix(github): emit PROMPT_TOO_LARGE error on context overflow (#14166)

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This commit is contained in:
Matt Silverlock
2026-02-18 12:45:27 -05:00
committed by GitHub
parent 5638b782c5
commit d447b7694a
2 changed files with 68 additions and 9 deletions
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39
packages/opencode/src/cli/cmd/github.ts
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@@ -174,6 +174,18 @@ export function extractResponseText(parts: MessageV2.Part[]): string | null {
throw new Error("Failed to parse response: no parts returned")
}
/**
* Formats a PROMPT_TOO_LARGE error message with details about files in the prompt.
* Content is base64 encoded, so we calculate original size by multiplying by 0.75.
*/
export function formatPromptTooLargeError(files: { filename: string; content: string }[]): string {
const fileDetails =
files.length > 0
? `\n\nFiles in prompt:\n${files.map((f) => ` - ${f.filename} (${((f.content.length * 0.75) / 1024).toFixed(0)} KB)`).join("\n")}`
: ""
return `PROMPT_TOO_LARGE: The prompt exceeds the model's context limit.${fileDetails}`
}
export const GithubCommand = cmd({
command: "github",
describe: "manage GitHub agent",
@@ -803,6 +815,7 @@ export const GithubRunCommand = cmd({
replacement,
})
}
return { userPrompt: prompt, promptFiles: imgData }
}
@@ -910,10 +923,15 @@ export const GithubRunCommand = cmd({
// result should always be assistant just satisfying type checker
if (result.info.role === "assistant" && result.info.error) {
console.error("Agent error:", result.info.error)
throw new Error(
`${result.info.error.name}: ${"message" in result.info.error ? result.info.error.message : ""}`,
)
const err = result.info.error
console.error("Agent error:", err)
if (err.name === "ContextOverflowError") {
throw new Error(formatPromptTooLargeError(files))
}
const errorMsg = err.data?.message || ""
throw new Error(`${err.name}: ${errorMsg}`)
}
const text = extractResponseText(result.parts)
@@ -939,10 +957,15 @@ export const GithubRunCommand = cmd({
})
if (summary.info.role === "assistant" && summary.info.error) {
console.error("Summary agent error:", summary.info.error)
throw new Error(
`${summary.info.error.name}: ${"message" in summary.info.error ? summary.info.error.message : ""}`,
)
const err = summary.info.error
console.error("Summary agent error:", err)
if (err.name === "ContextOverflowError") {
throw new Error(formatPromptTooLargeError(files))
}
const errorMsg = err.data?.message || ""
throw new Error(`${err.name}: ${errorMsg}`)
}
const summaryText = extractResponseText(summary.parts)