import { Effect } from "effect";import type { Connection, Integration, Executor } from "@executor-js/sdk/core"; /** * Builds a tool description dynamically. * * Structure: *   1. Workflow (top — critical, least likely to be truncated) *   2. Available connection prefixes (bottom) * * v2: callable API tools are scoped by saved connections. A tool's sandbox * address is `tools.<integration>.<owner>.<connection>.<tool>`, so the useful * inventory is the connection prefix rather than only the integration slug. */export const buildExecuteDescription = (executor: Executor): Effect.Effect<string> =>  Effect.gen(function* () {    const connections: readonly Connection[] = yield* executor.connections.list().pipe(      // oxlint-disable-next-line executor/no-effect-escape-hatch -- boundary: ExecutionEngine.getDescription currently exposes no error channel; engine typed-error widening is covered separately      Effect.orDie,      Effect.withSpan("executor.connections.list"),    );    const integrations: readonly Integration[] = yield* executor.integrations.list().pipe(      // oxlint-disable-next-line executor/no-effect-escape-hatch -- boundary: same getDescription error-channel constraint as connections.list above      Effect.orDie,      Effect.withSpan("executor.integrations.list"),    );     const description = yield* Effect.sync(() =>      formatDescription(connections.map((connection) => connectionEntry(connection, integrations))),    ).pipe(      Effect.withSpan("schema.compile.description", {        attributes: { "executor.connection_count": connections.length },      }),    );     yield* Effect.annotateCurrentSpan({      "executor.connection_count": connections.length,      "schema.kind": "execute",      // Connection inventory so a failing session build (which runs this during      // init) names the callable prefixes it resolved without listing tools.      "executor.connection_addresses": connections        .map((connection) => connectionPath(connection))        .slice(0, 50)        .join(","),      "executor.connection_integrations": [        ...new Set(connections.map((connection) => String(connection.integration))),      ].join(","),      "executor.connection_owners": [        ...new Set(connections.map((connection) => connection.owner)),      ].join(","),    });     return description;  }).pipe(Effect.withSpan("schema.describe.execute")); const connectionPath = (connection: Connection): string => {  const address = String(connection.address);  return address.startsWith("tools.") ? address.slice("tools.".length) : address;}; /** One inventory line: the callable prefix plus the best available context. *  Connection description wins (the user wrote it about THIS credential); *  otherwise the integration description, unless it is just the slug again. */interface ConnectionInventoryEntry {  readonly prefix: string;  readonly description?: string;} const inventoryNote = (  text: string | null | undefined,  identityEchoes: readonly string[],): string | undefined => {  const firstLine = (text ?? "").split("\n", 1)[0]!.trim();  if (firstLine.length === 0) return undefined;  // A description that just restates the slug or display name carries no  // information beyond identity — drop it from the inventory line.  if (identityEchoes.some((echo) => firstLine.toLowerCase() === echo.toLowerCase())) {    return undefined;  }  return firstLine.length > 140 ? `${firstLine.slice(0, 139)}…` : firstLine;}; const connectionEntry = (  connection: Connection,  integrations: readonly Integration[],): ConnectionInventoryEntry => {  const slug = String(connection.integration);  const integration = integrations.find((candidate) => String(candidate.slug) === slug);  const identityEchoes = [slug, ...(integration ? [integration.name] : [])];  return {    prefix: connectionPath(connection),    description:      inventoryNote(connection.description, identityEchoes) ??      inventoryNote(integration?.description, identityEchoes),  };}; const formatDescription = (connectionEntries: readonly ConnectionInventoryEntry[]): string => {  const lines: string[] = [    "Execute TypeScript in a sandboxed runtime with access to configured API tools.",    "",    "## Workflow",    "",    '1. `const { items: matches } = await tools.search({ query: "<intent + key nouns>", limit: 12 });`',    '2. `const path = matches[0]?.path; if (!path) return "No matching tools found.";`',    "3. `const details = await tools.describe.tool({ path });`",    "4. Use `details.inputTypeScript` / `details.outputTypeScript` and `details.typeScriptDefinitions` for compact shapes.",    "5. Use `tools.executor.coreTools.connections.list({})` when you need live saved-connection inventory.",    "6. Call the tool: `const result = await tools.<path>(input);`",    "",    "## Rules",    "",    "- `tools.search()` returns paginated, ranked matches: `{ items, total, hasMore, nextOffset }`. Best-first. Use short intent phrases like `github issues`, `repo details`, or `create calendar event`.",    '- When you already know the namespace, narrow with `tools.search({ namespace: "github", query: "issues" })`.',    "- `tools.executor.coreTools.connections.list({})` returns saved connections with `{ address, integration, owner, name, ... }`. The `address` field includes the leading `tools.` root.",    "- Tool calls return a value union: `{ ok: true, data }` for success or `{ ok: false, error: { code, message, status?, details?, retryable? } }` for expected tool/domain failures. Branch on `result.ok`.",    "- `data` is the upstream payload itself. HTTP-backed tools (OpenAPI) also set `http: { status, headers }` beside `data` — read `result.http?.headers` for pagination (Link) or rate-limit headers.",    "- Use `emit(value)` to append user-visible output and return `undefined`. Plain values become MCP text content. MCP content blocks are forwarded as-is. `ToolFile` values are rendered by MIME. Emitted output goes to the user, not back to you; the result envelope reports an `emitted` count so you can confirm it landed, but to read a value yourself, `return` it.",    "- Prefer explicit output helpers when the content kind is known: `text(value)`, `image(value, detail?)`, `audio(block)`, `file(toolFile)`, `resource(block)`, and `notify(value)`. `image` accepts a base64 data URI string, `{ image_url, detail }`, or a raw MCP image block; `detail` may be `auto`, `low`, `high`, or `original`.",    '- File-returning tools may return `ToolFile` values: `{ _tag: "ToolFile", name?, mimeType, encoding: "base64", data, byteLength }`. Emit any attachment with `emit(result.data)`.',    '- To emit MCP-native content directly, pass an MCP content block to `emit(...)`, such as `{ type: "image", data, mimeType }`, `{ type: "audio", data, mimeType }`, `{ type: "text", text }`, `{ type: "resource", resource }`, or `{ type: "resource_link", uri, name, ... }`.',    "- `emit(ToolFile)` is MIME-based: `image/*` becomes MCP image content, `audio/*` becomes MCP audio content, text-like files become decoded text, and other binary files become embedded MCP resources.",    "- `return` is only for ordinary structured data. Returning a `ToolFile`, a `ToolResult`, an MCP content block, or a bare base64 string does not emit content to the MCP client.",    "- Some providers, including Gmail, return attachment bytes without a public URL. To send that attachment to another API from code, decode `ToolFile.data` from base64 and pass the bytes to that API's upload/file input.",    "- If `tools.search()` returns `hasMore: true` and you didn't find what you need, fetch the next page: `tools.search({ query, offset: nextOffset, limit })`.",    "- Always use the full address when calling tools: `tools.<integration>.<owner>.<connection>.<tool>(args)`. The `path` returned by `tools.search()` / `tools.describe.tool()` is already the exact path under `tools` — call `tools[path]` rather than guessing segments.",    "- The `tools` object is a lazy proxy. `Object.keys(tools)` returns only bounded built-in discovery keys (`search`, `describe`, `executor`), not the full API catalog. Use `tools.search()` or `tools.executor.coreTools.connections.list({})` for configured tools.",    '- Pass an object to system tools, e.g. `tools.search({ query: "..." })`, `tools.executor.coreTools.connections.list({})`, and `tools.describe.tool({ path })`.',    '- `tools.describe.tool()` returns compact TypeScript shapes. Use `inputTypeScript`, `outputTypeScript`, and `typeScriptDefinitions`. If the path doesn\'t resolve, the result carries `error: { code: "tool_not_found", suggestions }` — use a suggestion instead of retrying the same path.',    "- For tools that return large collections (e.g. `getStates`, `getAll`), filter results in code rather than calling per-item tools.",    "- Do not use `fetch` — all API calls go through `tools.*`.",    "- If execution pauses for interaction, resume it with the returned `resumePayload`.",    "- TypeScript type syntax (`: T`, `as T`, generics, interfaces, type aliases) is stripped before execution — feel free to write idiomatic TypeScript using the shapes from `tools.describe.tool()`. Decorators and `enum` are not supported.",  ];   if (connectionEntries.length > 0) {    lines.push("");    lines.push("## Available connection prefixes");    lines.push("");    lines.push("These are paths under `tools.`; append the final tool segment.");    const sorted = [...connectionEntries]      .sort((a, b) => a.prefix.localeCompare(b.prefix))      .slice(0, 50);    for (const entry of sorted) {      lines.push(        entry.description          ? `- \`${entry.prefix}\` — ${entry.description}`          : `- \`${entry.prefix}\``,      );    }    if (connectionEntries.length > sorted.length) {      lines.push(`- ... ${connectionEntries.length - sorted.length} more`);    }  }   return lines.join("\n");};