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TypeScript
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export type { StreamEvent, ToolTrace, ToolProgress } from "./events.js"export type { ImageAttachment, ImageMetadata } from "./image.js"
export type FetchLike = (input: URL | RequestInfo, init?: RequestInit) => Promise<Response>
export interface CreateChatClientOptions { baseUrl: string fetchImpl?: FetchLike clientId?: string agentId?: string}
export interface StreamOptions { signal?: AbortSignal onOpen?: () => void onEvent: (event: StreamEvent) => void}
export type AgentPhase = "resting" | "preparing" | "reasoning" | "tool" | "waiting" | "compacting"export type AgentStatus = { running: boolean; idle: boolean; phase?: AgentPhase }export type WorkspaceUpdate = { workspace: string }
export class WorkspaceMissingError extends Error { readonly name = "WorkspaceMissingError" constructor(readonly workspace: string) { super(`workspace not found: ${workspace}`) }}
export interface ChatClient { /** The sender identity used by send; lets views suppress their optimistic echo. */ readonly clientId?: string send: (content: string, signal?: AbortSignal, image?: ImageAttachment) => Promise<{ ok: true; queued?: boolean }> replaceWorkspace?: (workspace: string, signal?: AbortSignal) => Promise<WorkspaceUpdate> interrupt?: () => Promise<{ interrupted: boolean }> getStatus: (signal?: AbortSignal) => Promise<AgentStatus> stream: (options: StreamOptions) => Promise<void>}
type UnknownEvent = { type?: unknown text?: unknown source?: unknown triggeredAt?: unknown timestamp?: unknown clientId?: unknown name?: unknown args?: unknown result?: unknown trace?: unknown images?: unknown progress?: unknown model?: unknown recordedAt?: unknown promptTokens?: unknown cachedPromptTokens?: unknown cacheWriteTokens?: unknown completionTokens?: unknown totalTokens?: unknown evicted?: unknown summary?: unknown image?: unknown elapsedMs?: unknown tokensPerSecond?: unknown}
const AGENT_PHASES = new Set<AgentPhase>(["resting", "preparing", "reasoning", "tool", "waiting"])
const normalizeUrl = (baseUrl: string): string => baseUrl.endsWith("/") ? baseUrl.slice(0, -1) : baseUrl
const toEvent = (raw: unknown): StreamEvent | null => { if (!raw || typeof raw !== "object") return null
const event = raw as UnknownEvent const stamp = typeof event.timestamp === "number" && Number.isSafeInteger(event.timestamp) && event.timestamp >= 0 ? { timestamp: event.timestamp } : {} if (event.type === "tool_progress") { if (event.progress === null) return { type: "tool_progress", progress: null } if (!event.progress || typeof event.progress !== "object") return null const progress = event.progress as Partial<ToolProgress> if (typeof progress.callId !== "string" || progress.callId.length > 200 || typeof progress.name !== "string" || progress.name.length > 100 || (progress.phase !== "generating" && progress.phase !== "running")) return null const intent = progress.intent const code = progress.code return { type: "tool_progress", progress: { ...(progress.phase === "generating" && code && Number.isSafeInteger(code.offset) && code.offset >= 0 && typeof code.text === "string" && code.text.length <= 512 ? { code: { offset: code.offset, text: code.text } } : {}), callId: progress.callId, name: progress.name.replace(/[\p{Cc}\p{Cf}]/gu, " "), phase: progress.phase, ...(intent && ["write", "edit", "read", "run"].includes(intent.kind) && typeof intent.target === "string" && intent.target.length <= 300 ? { intent: { kind: intent.kind, target: intent.target } } : {}), } } } if (event.type === "message" && typeof event.text === "string") return { type: "message", role: "assistant", text: event.text, ...stamp } if (event.type === "interrupted") return { type: "interrupted" } if (event.type === "retry") return { type: "retry" }
if ( event.type === "user" && typeof event.text === "string" && typeof event.source === "string" && typeof event.triggeredAt === "string" ) { const image = parseImageMetadata(event.image) return { type: "user", text: event.text, source: event.source, triggeredAt: event.triggeredAt, ...stamp, ...(typeof event.clientId === "string" ? { clientId: event.clientId } : {}), ...(image ? { image } : {}), } }
if (event.type === "thinking" && typeof event.text === "string") { return { type: "thinking", text: event.text } }
if (event.type === "error" && typeof event.text === "string") { return { type: "error", text: event.text } }
if ( event.type === "tool" && typeof event.name === "string" && typeof event.result === "string" && event.args && typeof event.args === "object" ) { const trace = parseToolTrace(event.trace) const images = Array.isArray(event.images) ? event.images.map(parseImageMetadata).filter((image): image is ImageMetadata => image !== undefined) : [] return { type: "tool", name: event.name, args: event.args as Record<string, unknown>, result: event.result, ...(trace ? { trace } : {}), ...(images.length ? { images } : {}), } }
if (event.type === "usage") { return { type: "usage", model: typeof event.model === "string" ? event.model : undefined, recordedAt: typeof event.recordedAt === "number" && Number.isFinite(event.recordedAt) ? event.recordedAt : undefined, promptTokens: typeof event.promptTokens === "number" ? event.promptTokens : undefined, cachedPromptTokens: typeof event.cachedPromptTokens === "number" ? event.cachedPromptTokens : undefined, cacheWriteTokens: typeof event.cacheWriteTokens === "number" ? event.cacheWriteTokens : undefined, completionTokens: typeof event.completionTokens === "number" ? event.completionTokens : undefined, totalTokens: typeof event.totalTokens === "number" ? event.totalTokens : undefined, elapsedMs: typeof event.elapsedMs === "number" ? event.elapsedMs : undefined, tokensPerSecond: typeof event.tokensPerSecond === "number" ? event.tokensPerSecond : undefined, } }
if (event.type === "compacted" && typeof event.evicted === "number" && Number.isSafeInteger(event.evicted) && event.evicted >= 0 && event.evicted <= 1_000_000 && typeof event.summary === "string" && event.summary.length <= 60_000) { return { type: "compacted", evicted: event.evicted, summary: event.summary } }
if (typeof event.text === "string") { return { type: "text", text: event.text } }
return null}
/** Conversation records carry the durable text of a turn; only the agent's own replies are new information. */const toMessage = (raw: unknown): StreamEvent | null => { if (!raw || typeof raw !== "object") return null const record = raw as { role?: unknown; content?: unknown } if (record.role !== "assistant" || typeof record.content !== "string" || !record.content.trim()) return null return { type: "message", role: "assistant", text: record.content }}
const responseError = async (res: Response): Promise<Error> => { const fallback = `${res.status} ${res.statusText}`.trim() || "request failed"
try { const data = (await res.json()) as { code?: unknown; error?: unknown; workspace?: unknown } if (data.code === "workspace_missing" && typeof data.workspace === "string") return new WorkspaceMissingError(data.workspace) if (typeof data.error === "string" && data.error.trim()) return new Error(data.error) } catch {}
return new Error(fallback)}
const splitLines = (chunkBuffer: string): { lines: string[]; rest: string } => { const normalized = chunkBuffer.replace(/\r\n/g, "\n") const lines = normalized.split("\n") const rest = lines.pop() ?? "" return { lines, rest }}
export function createChatClient(options: CreateChatClientOptions): ChatClient { const fetchImpl = options.fetchImpl ?? fetch const baseUrl = normalizeUrl(options.baseUrl) const clientId = options.clientId ?? `cli-${crypto.randomUUID()}` const agentId = options.agentId?.trim() const headers = (json = false): HeadersInit => ({ ...(json ? { "content-type": "application/json" } : {}), }) const url = (path: string) => `${baseUrl}${path}` const agentUrl = (path: string) => agentId ? url(`/sessions/${encodeURIComponent(agentId)}${path}`) : url(path)
const requestSignal = (signal?: AbortSignal): AbortSignal => signal ? AbortSignal.any([signal, AbortSignal.timeout(20_000)]) : AbortSignal.timeout(20_000) const send: ChatClient["send"] = async (content, signal, image) => { const res = await fetchImpl(agentUrl(agentId ? "/events" : "/trigger/chat"), { method: "POST", headers: headers(true), body: JSON.stringify({ content, ...(image ? { image } : {}), ...(clientId ? { clientId } : {}) }), signal: requestSignal(signal), })
if (!res.ok) { throw await responseError(res) }
const data = await res.json().catch(() => ({})) as { queued?: unknown } return { ok: true, queued: data.queued === true } }
const replaceWorkspace: ChatClient["replaceWorkspace"] = agentId ? async (workspace, signal) => { const health = await fetchImpl(url("/health"), { headers: headers(), signal: requestSignal(signal) }) if (!health.ok) throw await responseError(health) const capabilities = (await health.json() as { capabilities?: unknown }).capabilities if (!Array.isArray(capabilities) || !capabilities.includes("session_workspace")) throw new Error("daemon upgrade needed to change this workspace; when ready, run albedo daemon --stop, then albedo (this clears python variables)")
const res = await fetchImpl(agentUrl("/workspace"), { method: "POST", headers: headers(true), body: JSON.stringify({ workspace }), signal: requestSignal(signal), }) if (!res.ok) throw await responseError(res) const data = await res.json() as { workspace?: unknown } if (typeof data.workspace !== "string") throw new Error("daemon returned invalid session metadata") return { workspace: data.workspace } } : undefined
const interrupt = async (): Promise<{ interrupted: boolean }> => { const res = await fetchImpl(agentUrl(agentId ? "/interrupt" : "/awp/interrupt"), { method: "POST", headers: headers(), signal: AbortSignal.timeout(15_000) }) if (!res.ok) throw await responseError(res) const data = await res.json() as { interrupted?: unknown } return { interrupted: data.interrupted === true } }
const getStatus: ChatClient["getStatus"] = async (signal) => { const res = await fetchImpl(agentUrl("/status"), { headers: headers(), signal: requestSignal(signal) }) if (!res.ok) { throw await responseError(res) }
const data = (await res.json()) as { running?: unknown; idle?: unknown; phase?: unknown } const phase = typeof data.phase === "string" && AGENT_PHASES.has(data.phase as AgentPhase) ? data.phase as AgentPhase : undefined return { running: data.running === true, idle: data.idle === true, ...(phase ? { phase } : {}) } }
let afterSeq = -1 const argumentsByCall = new Map<string, string>() const stream: ChatClient["stream"] = async ({ signal, onOpen, onEvent }) => { const route = agentId ? `/stream?after_seq=${afterSeq}` : `/awp/stream?${afterSeq ? `after_seq=${afterSeq}` : "tail=true"}` const res = await fetchImpl(agentUrl(route), { signal, headers: headers() }) if (!res.ok || !res.body) { throw res.ok ? new Error("stream body missing") : await responseError(res) } onOpen?.()
const reader = res.body.getReader() const decoder = new TextDecoder() let buffer = "" let eventSeq = afterSeq let eventType = "" const report = createToolProgressReporter(progress => onEvent({ type: "tool_progress", progress })) const cancel = (): void => { void reader.cancel().catch(() => {}) } signal?.addEventListener("abort", cancel, { once: true })
try { while (!signal?.aborted) { const { done, value } = await reader.read() if (done) break
buffer += decoder.decode(value, { stream: true }) const { lines, rest } = splitLines(buffer) buffer = rest
for (const line of lines) { if (!line) eventType = "" if (line.startsWith("event:")) eventType = line.slice(6).trim() if (line.startsWith("id:")) { const sequence = Number(line.slice(3).trim()) if (Number.isSafeInteger(sequence) && sequence > 0) { eventSeq = sequence } } if (!line.startsWith("data:")) continue
const payload = line.slice(5).trimStart() if (!payload) continue
let raw: unknown try { raw = JSON.parse(payload) } catch { continue } if (eventType === "error") { const error = raw as { error?: unknown; text?: unknown } | null throw new Error(typeof error?.error === "string" ? error.error : typeof error?.text === "string" ? error.text : `event stream failed: ${JSON.stringify(raw)}`) } const page = raw as { cursor?: unknown; events?: unknown } if (Number.isSafeInteger(page?.cursor) && Array.isArray(page.events)) { for (const serialized of page.events) { const item = serialized as Record<string, unknown> if (["reset", "retry", "turn_started", "message", "interrupted", "error"].includes(String(item.type))) { argumentsByCall.clear() report(null, "running") } if (item.type === "reset") { onEvent({ type: "reset" }); continue } if (item.type === "turn_started") continue if (item.type === "tool") { if (typeof item.callId === "string") argumentsByCall.delete(item.callId) report(null, "running") } if (item.type === "tool_progress") { const progress = item.progress as Partial<ToolProgress> | null if (progress?.phase === "running" && typeof progress.callId === "string") { argumentsByCall.delete(progress.callId) report(null, "running") } } if (item.type === "arguments_delta" && typeof item.callId === "string" && typeof item.text === "string") { const fresh = !argumentsByCall.has(item.callId) const retained = [...argumentsByCall].reduce((size, [id, args]) => size + id.length + args.length, 0) if ((fresh && argumentsByCall.size >= 32) || retained + item.text.length + (fresh ? item.callId.length : 0) > 2_000_000) { argumentsByCall.clear() afterSeq = -1 throw new Error("tool argument previews exceed client limit") } const args = (argumentsByCall.get(item.callId) ?? "") + item.text argumentsByCall.set(item.callId, args) report({ id: item.callId, function: { name: "python", arguments: args } }, "generating") continue } if (item.type === "tool" && typeof item.args === "string") { try { item.args = JSON.parse(item.args) } catch { item.args = {} } } const event = toEvent(item) if (event) onEvent(event) } afterSeq = page.cursor as number continue } const envelope = raw && typeof raw === "object" ? (raw as { type?: unknown; payload?: unknown }) : null const event = envelope?.type === "stream.event" ? toEvent(envelope.payload) : envelope?.type === "conversation.message" ? toMessage(envelope.payload) : toEvent(raw) if (event) onEvent(event) afterSeq = Math.max(afterSeq, eventSeq) } } } finally { // Reconnects keep bounded unfinished arguments; detaching releases them // and starts any future attachment from a fresh snapshot. if (signal?.aborted) { argumentsByCall.clear(); afterSeq = -1 } signal?.removeEventListener("abort", cancel) await reader.cancel().catch(() => {}) reader.releaseLock() report(null, "running") } }
return { clientId, send, ...(replaceWorkspace ? { replaceWorkspace } : {}), interrupt, getStatus, stream, }}