| ... | ... | @@ -150,28 +150,12 @@ export interface BranchNamePromptInput { |
| 150 | 150 | interface PromptFromMessageInput { |
| 151 | 151 | instruction: string; |
| 152 | 152 | responseShape: string; |
| 153 | | guidance?: ReadonlyArray<string> | undefined; |
| 154 | | rulesLabel?: string | undefined; |
| 155 | 153 | rules: ReadonlyArray<string>; |
| 156 | | afterRules?: ReadonlyArray<string> | undefined; |
| 157 | 154 | message: string; |
| 158 | | messageLabel?: string | undefined; |
| 159 | | preserveMessageEnd?: boolean | undefined; |
| 160 | 155 | attachments?: ReadonlyArray<ChatAttachment> | undefined; |
| 161 | 156 | additionalInstructions?: string | undefined; |
| 162 | 157 | } |
| 163 | 158 | |
| 164 | | function preserveMessageEnd(message: string): string { |
| 165 | | const alreadyTruncated = message.startsWith(EARLIER_CONTENT_TRUNCATION_MARKER); |
| 166 | | const contents = alreadyTruncated |
| 167 | | ? message.slice(EARLIER_CONTENT_TRUNCATION_MARKER.length) |
| 168 | | : message; |
| 169 | | if (!alreadyTruncated && contents.length <= 8_000) { |
| 170 | | return contents; |
| 171 | | } |
| 172 | | return `${EARLIER_CONTENT_TRUNCATION_MARKER}${contents.slice(-8_000)}`; |
| 173 | | } |
| 174 | | |
| 175 | 159 | function buildPromptFromMessage(input: PromptFromMessageInput): string { |
| 176 | 160 | const attachmentLines = (input.attachments ?? []).map( |
| 177 | 161 | (attachment) => `- ${attachment.name} (${attachment.mimeType}, ${attachment.sizeBytes} bytes)`, |
| ... | ... | @@ -180,15 +164,11 @@ function buildPromptFromMessage(input: PromptFromMessageInput): string { |
| 180 | 164 | const promptSections = [ |
| 181 | 165 | input.instruction, |
| 182 | 166 | input.responseShape, |
| 183 | | ...(input.guidance ?? []), |
| 184 | | input.rulesLabel ?? "Rules:", |
| 167 | "Rules:", |
| 185 | 168 | ...input.rules.map((rule) => `- ${rule}`), |
| 186 | | ...(input.afterRules ?? []), |
| 187 | 169 | "", |
| 188 | | `${input.messageLabel ?? "User message"}:`, |
| 189 | | input.preserveMessageEnd |
| 190 | | ? preserveMessageEnd(input.message) |
| 191 | | : limitSection(input.message, 8_000), |
| 170 | "User message:", |
| 171 | limitSection(input.message, 8_000), |
| 192 | 172 | ...policyInstruction(input.additionalInstructions), |
| 193 | 173 | ]; |
| 194 | 174 | if (attachmentLines.length > 0) { |
| ... | ... | @@ -234,88 +214,102 @@ export interface ThreadTitlePromptInput { |
| 234 | 214 | policy?: TextGenerationPolicy | undefined; |
| 235 | 215 | } |
| 236 | 216 | |
| 217 | // Keep shared editorial rules in these two prompts in sync. Regeneration |
| 218 | // intentionally adds guidance for thread history and the previous title. |
| 219 | const INITIAL_THREAD_TITLE_PROMPT = `Generate a title that will help the user recognize this T3 Code thread weeks later. |
| 220 | Return JSON with exactly one key: title. |
| 221 | |
| 222 | Before answering, silently reduce the request to: |
| 223 | - Subject: What system, feature, or problem is this really about? |
| 224 | - Outcome: What does the user ultimately want to understand or change? |
| 225 | - Incidental instructions: What only describes how the agent should do the work? |
| 226 | |
| 227 | Title the subject and outcome. Discard incidental instructions. |
| 228 | |
| 229 | Editorial rules: |
| 230 | - 3-8 words, fewer than 40 characters. |
| 231 | - Use a compact noun phrase or clear action phrase. |
| 232 | - Capture the umbrella goal when the request lists several symptoms or steps. |
| 233 | - Name the product change, not the mock, plan, report, branch, or PR used to produce it. |
| 234 | - Models, subagents, tools, output formats, and monitoring instructions do not belong in the title unless they are themselves the topic. |
| 235 | - For reviews, name what is being reviewed and the relevant concern. Avoid generic titles such as "Review PR 123" when linked or attached context reveals the subject. |
| 236 | - For research, name the question domain rather than the requested research process. |
| 237 | - Do not claim the work is complete. |
| 238 | - Do not copy and truncate the user's message. |
| 239 | - Avoid project names already visible in the UI, quotes, labels, filler, and trailing punctuation. |
| 240 | - Use attached images as primary context for UI issues. |
| 241 | - When a URL or attachment is the only source of the subject, use available tools to inspect it. If it cannot be resolved, remain accurate rather than guessing.`; |
| 242 | |
| 243 | function regenerateThreadTitlePrompt(previousTitle: string): string { |
| 244 | return `Regenerate the title for an existing T3 Code thread so the user can recognize it weeks later. |
| 245 | The previous title was ${JSON.stringify(previousTitle)}. |
| 246 | Return JSON with exactly one key: title. |
| 247 | |
| 248 | Determine the title in this order: |
| 249 | 1. Read the USER messages first. Identify the latest explicit durable goal. The original subject remains the subject until the user clearly changes what the thread is about. |
| 250 | 2. Use ASSISTANT messages to resolve vague links, unnamed code, and discovered product nouns. Do not promote one assistant finding into the thread subject unless the user adopts it as a new goal. |
| 251 | 3. Compare that subject with the previous title. Preserve accurate scope words, especially when earlier content is truncated. Replace the previous title when it is generic, artifact-based, a completion update, or contradicted by the thread. |
| 252 | 4. Title the durable subject and desired outcome, not the current workflow state. |
| 253 | |
| 254 | Editorial rules: |
| 255 | - 3-8 words, fewer than 40 characters. |
| 256 | - Use a compact noun phrase or clear action phrase. |
| 257 | - Preserve the umbrella subject when later messages focus on one finding, provider, platform, or implementation detail. |
| 258 | - A thread progressing through research, planning, implementation, review, CI, merge, and monitoring has usually not changed subjects. |
| 259 | - Ignore deliverables and operations such as mocks, plans, HTML, branches, PRs, tests, CI, commits, merging, and monitoring unless they are the actual topic. |
| 260 | - Models, subagents, tools, output formats, and monitoring instructions do not belong in the title unless they are themselves the topic. |
| 261 | - Treat final operational follow-ups and assistant completion summaries as weak evidence of subject. |
| 262 | - For reviews, name the reviewed feature or system and its durable concern, not one finding from the review. |
| 263 | - For research, name the question domain rather than the research process. |
| 264 | - Do not claim the work is complete. |
| 265 | - Do not copy and truncate a thread message. |
| 266 | - Avoid project names already visible in the UI, PR numbers, quotes, labels, filler, and trailing punctuation. |
| 267 | - Use attached images as primary context for UI issues. |
| 268 | - When a URL or attachment is the only source of the subject, use available tools to inspect it. If it cannot be resolved, remain accurate rather than guessing. |
| 269 | - Return a meaningfully improved title, not a cosmetic paraphrase of the previous title. |
| 270 | |
| 271 | Examples of the distinction: |
| 272 | - A subagent-monitoring review that finds a Codex roster bug remains "Review Subagent Monitoring Risks," not "Codex Roster Bug Review." |
| 273 | - A vague failing-test request later identified as a lazy thread-feed mismatch becomes "Fix Lazy Thread Feed Test," not "Prevent Mobile Feed Regressions." |
| 274 | - A QR-sharing overhaul that ends with CI and merge work remains about QR sharing, not the PR lifecycle.`; |
| 275 | } |
| 276 | |
| 277 | function preserveMessageEnd(message: string): string { |
| 278 | const alreadyTruncated = message.startsWith(EARLIER_CONTENT_TRUNCATION_MARKER); |
| 279 | const contents = alreadyTruncated |
| 280 | ? message.slice(EARLIER_CONTENT_TRUNCATION_MARKER.length) |
| 281 | : message; |
| 282 | if (!alreadyTruncated && contents.length <= 8_000) { |
| 283 | return contents; |
| 284 | } |
| 285 | return `${EARLIER_CONTENT_TRUNCATION_MARKER}${contents.slice(-8_000)}`; |
| 286 | } |
| 287 | |
| 288 | function threadTitlePromptSuffix(input: ThreadTitlePromptInput): string { |
| 289 | const additionalInstructions = policyInstruction(input.policy?.threadTitleInstructions); |
| 290 | const attachmentLines = (input.attachments ?? []).map( |
| 291 | (attachment) => `- ${attachment.name} (${attachment.mimeType}, ${attachment.sizeBytes} bytes)`, |
| 292 | ); |
| 293 | |
| 294 | let suffix = ""; |
| 295 | if (additionalInstructions.length > 0) { |
| 296 | suffix = `\n${additionalInstructions.join("\n")}`; |
| 297 | } |
| 298 | if (attachmentLines.length > 0) { |
| 299 | suffix += `\n\nAttachment metadata:\n${limitSection(attachmentLines.join("\n"), 4_000)}`; |
| 300 | } |
| 301 | return suffix; |
| 302 | } |
| 303 | |
| 237 | 304 | export function buildThreadTitlePrompt(input: ThreadTitlePromptInput) { |
| 238 | | const isRegeneration = input.previousTitle !== undefined; |
| 239 | | const prompt = buildPromptFromMessage({ |
| 240 | | instruction: isRegeneration |
| 241 | | ? [ |
| 242 | | "Regenerate the title for an existing T3 Code thread so the user can recognize it weeks later.", |
| 243 | | `The previous title was ${JSON.stringify(input.previousTitle)}.`, |
| 244 | | ].join("\n") |
| 245 | | : "Generate a title that will help the user recognize this T3 Code thread weeks later.", |
| 246 | | responseShape: "Return JSON with exactly one key: title.", |
| 247 | | guidance: isRegeneration |
| 248 | | ? [ |
| 249 | | "", |
| 250 | | "Determine the title in this order:", |
| 251 | | "1. Read the USER messages first. Identify the latest explicit durable goal. The original subject remains the subject until the user clearly changes what the thread is about.", |
| 252 | | "2. Use ASSISTANT messages to resolve vague links, unnamed code, and discovered product nouns. Do not promote one assistant finding into the thread subject unless the user adopts it as a new goal.", |
| 253 | | "3. Compare that subject with the previous title. Preserve accurate scope words, especially when earlier content is truncated. Replace the previous title when it is generic, artifact-based, a completion update, or contradicted by the thread.", |
| 254 | | "4. Title the durable subject and desired outcome, not the current workflow state.", |
| 255 | | "", |
| 256 | | ] |
| 257 | | : [ |
| 258 | | "", |
| 259 | | "Before answering, silently reduce the request to:", |
| 260 | | "- Subject: What system, feature, or problem is this really about?", |
| 261 | | "- Outcome: What does the user ultimately want to understand or change?", |
| 262 | | "- Incidental instructions: What only describes how the agent should do the work?", |
| 263 | | "", |
| 264 | | "Title the subject and outcome. Discard incidental instructions.", |
| 265 | | "", |
| 266 | | ], |
| 267 | | rulesLabel: "Editorial rules:", |
| 268 | | rules: isRegeneration |
| 269 | | ? [ |
| 270 | | "3-8 words, fewer than 40 characters.", |
| 271 | | "Use a compact noun phrase or clear action phrase.", |
| 272 | | "Preserve the umbrella subject when later messages focus on one finding, provider, platform, or implementation detail.", |
| 273 | | "A thread progressing through research, planning, implementation, review, CI, merge, and monitoring has usually not changed subjects.", |
| 274 | | "Ignore deliverables and operations such as mocks, plans, HTML, branches, PRs, tests, CI, commits, merging, and monitoring unless they are the actual topic.", |
| 275 | | "Models, subagents, tools, output formats, and monitoring instructions do not belong in the title unless they are themselves the topic.", |
| 276 | | "Treat final operational follow-ups and assistant completion summaries as weak evidence of subject.", |
| 277 | | "For reviews, name the reviewed feature or system and its durable concern, not one finding from the review.", |
| 278 | | "For research, name the question domain rather than the research process.", |
| 279 | | "Do not claim the work is complete.", |
| 280 | | "Do not copy and truncate a thread message.", |
| 281 | | "Avoid project names already visible in the UI, PR numbers, quotes, labels, filler, and trailing punctuation.", |
| 282 | | "Use attached images as primary context for UI issues.", |
| 283 | | "When a URL or attachment is the only source of the subject, use available tools to inspect it. If it cannot be resolved, remain accurate rather than guessing.", |
| 284 | | "Return a meaningfully improved title, not a cosmetic paraphrase of the previous title.", |
| 285 | | ] |
| 286 | | : [ |
| 287 | | "3-8 words, fewer than 40 characters.", |
| 288 | | "Use a compact noun phrase or clear action phrase.", |
| 289 | | "Capture the umbrella goal when the request lists several symptoms or steps.", |
| 290 | | "Name the product change, not the mock, plan, report, branch, or PR used to produce it.", |
| 291 | | "Models, subagents, tools, output formats, and monitoring instructions do not belong in the title unless they are themselves the topic.", |
| 292 | | 'For reviews, name what is being reviewed and the relevant concern. Avoid generic titles such as "Review PR 123" when linked or attached context reveals the subject.', |
| 293 | | "For research, name the question domain rather than the requested research process.", |
| 294 | | "Do not claim the work is complete.", |
| 295 | | "Do not copy and truncate the user's message.", |
| 296 | | "Avoid project names already visible in the UI, quotes, labels, filler, and trailing punctuation.", |
| 297 | | "Use attached images as primary context for UI issues.", |
| 298 | | "When a URL or attachment is the only source of the subject, use available tools to inspect it. If it cannot be resolved, remain accurate rather than guessing.", |
| 299 | | ], |
| 300 | | afterRules: isRegeneration |
| 301 | | ? [ |
| 302 | | "", |
| 303 | | "Examples of the distinction:", |
| 304 | | '- A subagent-monitoring review that finds a Codex roster bug remains "Review Subagent Monitoring Risks," not "Codex Roster Bug Review."', |
| 305 | | '- A vague failing-test request later identified as a lazy thread-feed mismatch becomes "Fix Lazy Thread Feed Test," not "Prevent Mobile Feed Regressions."', |
| 306 | | "- A QR-sharing overhaul that ends with CI and merge work remains about QR sharing, not the PR lifecycle.", |
| 307 | | ] |
| 308 | | : undefined, |
| 309 | | message: input.message, |
| 310 | | ...(isRegeneration |
| 311 | | ? { |
| 312 | | messageLabel: "Thread contents", |
| 313 | | preserveMessageEnd: true, |
| 314 | | } |
| 315 | | : {}), |
| 316 | | attachments: input.attachments, |
| 317 | | additionalInstructions: input.policy?.threadTitleInstructions, |
| 318 | | }); |
| 305 | let prompt: string; |
| 306 | if (input.previousTitle === undefined) { |
| 307 | const message = limitSection(input.message, 8_000); |
| 308 | prompt = `${INITIAL_THREAD_TITLE_PROMPT}\n\nUser message:\n${message}${threadTitlePromptSuffix(input)}`; |
| 309 | } else { |
| 310 | const message = preserveMessageEnd(input.message); |
| 311 | prompt = `${regenerateThreadTitlePrompt(input.previousTitle)}\n\nThread contents:\n${message}${threadTitlePromptSuffix(input)}`; |
| 312 | } |
| 319 | 313 | const outputSchema = Schema.Struct({ |
| 320 | 314 | title: Schema.String, |
| 321 | 315 | }); |
Theo Browne <me@t3.gg> 2026-08-04 15:51:56-07:00
GitHub <noreply@github.com> 2026-08-04 15:51:56-07:00