515 lines
18 KiB
TypeScript
515 lines
18 KiB
TypeScript
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/**
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* Claude Agent Skills: reusable SKILL.md recipes shared across assistants.
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* The Pi runtime already understands this format; we persist and inject them.
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* Distinct from taught skills (demo/record playbooks on a single bot).
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*/
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const FRONTMATTER_FENCE = /^---\r?\n([\s\S]*?)\r?\n---\r?\n?/;
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export type SkillSource = "user" | "builtin" | "plugin";
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export type ParsedSkillMd = {
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name: string;
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description: string;
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/** Markdown body after the frontmatter fence. */
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body: string;
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/**
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* All frontmatter keys as parsed scalars/structures. Unknown keys are preserved
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* so Claude Agent Skills with extra fields round-trip safely.
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*/
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frontmatter: Record<string, unknown>;
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};
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export type SkillCatalogEntry = {
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name: string;
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description: string;
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source: SkillSource;
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readOnly: boolean;
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};
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export type SkillRecord = SkillCatalogEntry & {
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id?: string;
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content: string;
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};
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const FORCE_SKILL_PREFIX = /^(?:\/|use\s+skill:\s*)(.+?)(?:\n|$)/i;
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const ROUTINE_SKILL_STOP = new Set([
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"then",
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"and",
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"or",
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"to",
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"for",
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"with",
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"from",
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"via",
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"before",
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"after",
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"please",
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"the",
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"a",
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"an",
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]);
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/** Fallback when no catalog is available: @Token with optional Title-case words. */
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const ROUTINE_SKILL_MENTION =
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/(?:^|[\s(,])@([A-Za-z][\w-]*(?:[ ]+[A-Za-z][\w-]*){0,5})(?=[\s,.)]|$)/g;
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export function isSkillReadOnly(source: SkillSource): boolean {
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return source === "builtin" || source === "plugin";
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}
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/**
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* Parse a SKILL.md document. Requires YAML frontmatter with `name` and `description`.
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* Extra frontmatter keys are kept in `frontmatter`.
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*/
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export function parseSkillMd(content: string): ParsedSkillMd | { error: string } {
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const trimmed = content.replace(/^\uFEFF/, "");
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const match = FRONTMATTER_FENCE.exec(trimmed);
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if (!match) {
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return { error: "SKILL.md must start with YAML frontmatter (--- ... ---)." };
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}
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const frontmatterText = match[1] ?? "";
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const body = trimmed.slice(match[0].length).replace(/^\r?\n/, "");
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let frontmatter: Record<string, unknown>;
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try {
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frontmatter = parseSimpleYamlObject(frontmatterText);
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} catch (error) {
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return {
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error: error instanceof Error ? error.message : "Invalid SKILL.md frontmatter.",
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};
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}
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const name = stringifyScalar(frontmatter.name).trim();
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const description = stringifyScalar(frontmatter.description).trim();
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if (!name) return { error: "SKILL.md frontmatter requires name." };
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if (!description) return { error: "SKILL.md frontmatter requires description." };
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if (name.length > 80) return { error: "Skill name must be at most 80 characters." };
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if (description.length > 2000) {
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return { error: "Skill description must be at most 2000 characters." };
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}
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return { name, description, body, frontmatter };
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}
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/** Build SKILL.md, preserving unknown frontmatter keys from a prior parse. */
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export function buildSkillMd(input: {
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name: string;
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description: string;
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body: string;
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frontmatter?: Record<string, unknown>;
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}): string {
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const name = input.name.trim();
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const description = input.description.trim();
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if (!name) throw new Error("Skill name is required.");
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if (!description) throw new Error("Skill description is required.");
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if (name.length > 80) throw new Error("Skill name must be at most 80 characters.");
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if (description.length > 2000) {
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throw new Error("Skill description must be at most 2000 characters.");
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}
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const merged: Record<string, unknown> = { ...(input.frontmatter ?? {}) };
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merged.name = name;
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merged.description = description;
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// Stable order: name, description, then remaining keys alphabetically.
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const rank = (key: string) => (key === "name" ? 0 : key === "description" ? 1 : 2);
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const keys = Object.keys(merged).sort((a, b) => {
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const diff = rank(a) - rank(b);
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return diff !== 0 ? diff : a.localeCompare(b);
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});
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const lines = keys.map((key) => formatYamlLine(key, merged[key]));
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const body = input.body.replace(/^\r?\n/, "");
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return `---\n${lines.join("\n")}\n---\n${body.startsWith("\n") ? body : `\n${body}`}`;
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}
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export function skillCatalogLine(entry: Pick<SkillCatalogEntry, "name" | "description">): string {
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return `- ${entry.name}: ${entry.description}`;
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}
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export function formatSkillsCatalogInstruction(entries: SkillCatalogEntry[]): string | undefined {
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if (entries.length === 0) return undefined;
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const lines = entries.slice(0, 50).map(skillCatalogLine).join("\n");
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return [
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"Available Claude Agent Skills (SKILL.md recipes shared across assistants; generic how-tos, not account-specific routines). The Pi runtime already understands this format; we persist and inject them:",
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lines,
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"When a skill matches the user's request, call skill_read for that name and follow it immediately. Prefer matching skills over improvising multi-step recipes.",
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"Users can force a skill with /Name in the composer. Routines may mention a skill as @Name — that loads the skill at fire time.",
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"Create a skill with skill_create when a multi-step task is worth repeating (or when asked). After creating one, mention /Name so the user can open it.",
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"Only skill_update / skill_delete user-created skills (not builtin or plugin).",
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].join("\n");
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}
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export function formatForcedSkillPrompt(name: string, content: string, rest?: string): string {
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const parts = [`Use skill: ${name}`, "", content.trim()];
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const trailing = rest?.trim();
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if (trailing) parts.push("", trailing);
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return parts.join("\n");
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}
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/** Detect a composer-forced skill (`/Name` or `Use skill: Name`) at the start of a prompt. */
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export function extractForcedSkillName(prompt: string): { name: string; rest: string } | null {
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const text = prompt.trimStart();
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const match = FORCE_SKILL_PREFIX.exec(text);
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if (!match) return null;
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const name = (match[1] ?? "").trim().replace(/^\/+/, "").trim();
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if (!name || name.length > 80) return null;
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// Avoid treating `/` settings actions as skills.
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if (/^(chat\s+settings|settings:)/i.test(name)) return null;
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const rest = text.slice(match[0].length).trimStart();
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return { name, rest };
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}
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/**
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* Mentions like `@Daily standup` inside a routine prompt. Returns unique names in order.
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* When `knownNames` is provided, matches those names (longest first). Otherwise uses a
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* heuristic that stops before common connector words and skips `@everyone`.
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*/
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export function extractRoutineSkillMentions(prompt: string, knownNames?: string[]): string[] {
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if (knownNames && knownNames.length > 0) {
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const sorted = [...knownNames].sort((a, b) => b.length - a.length);
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const found: string[] = [];
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const seen = new Set<string>();
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for (const name of sorted) {
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const re = new RegExp(`(?:^|[\\s(,])@${escapeRegExp(name)}(?=[\\s,.)]|$)`, "gi");
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if (!re.test(prompt)) continue;
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const key = name.toLowerCase();
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if (seen.has(key)) continue;
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seen.add(key);
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found.push(name);
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}
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return found;
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}
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const names: string[] = [];
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const seen = new Set<string>();
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ROUTINE_SKILL_MENTION.lastIndex = 0;
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let match = ROUTINE_SKILL_MENTION.exec(prompt);
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while (match !== null) {
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const raw = (match[1] ?? "").trim();
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if (!raw) {
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match = ROUTINE_SKILL_MENTION.exec(prompt);
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continue;
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}
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const parts = raw.split(/\s+/);
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while (parts.length > 1 && ROUTINE_SKILL_STOP.has(parts[parts.length - 1]!.toLowerCase())) {
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parts.pop();
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}
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const name = parts.join(" ").trim();
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if (!name || name.toLowerCase() === "everyone") {
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match = ROUTINE_SKILL_MENTION.exec(prompt);
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continue;
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}
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const key = name.toLowerCase();
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if (!seen.has(key)) {
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seen.add(key);
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names.push(name);
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}
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match = ROUTINE_SKILL_MENTION.exec(prompt);
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}
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return names;
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}
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export function findSkillByName<T extends { name: string }>(
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skills: readonly T[],
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name: string,
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): T | undefined {
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const needle = name.trim().toLowerCase();
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if (!needle) return undefined;
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return skills.find((skill) => skill.name.trim().toLowerCase() === needle);
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}
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/** True when `rest` already begins with the skill body (prior expand pass). */
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function restAlreadyIncludesSkillContent(rest: string, content: string): boolean {
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const trimmedRest = rest.trim();
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const trimmedContent = content.trim();
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if (!trimmedContent) return false;
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return (
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trimmedRest === trimmedContent ||
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trimmedRest.startsWith(`${trimmedContent}\n`) ||
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trimmedRest.startsWith(`${trimmedContent}\r\n`)
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);
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}
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/** Expand forced `/Name` or routine `@Name` mentions into full skill bodies for the task prompt. */
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export function expandSkillReferencesInPrompt(
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prompt: string,
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skills: readonly SkillRecord[],
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): string {
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const forced = extractForcedSkillName(prompt);
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if (forced) {
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const skill = findSkillByName(skills, forced.name);
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if (skill) {
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// Routines expand at fire time into `Use skill: …`; run time expands again — stay idempotent.
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if (restAlreadyIncludesSkillContent(forced.rest, skill.content)) {
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return prompt.trimStart();
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}
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return formatForcedSkillPrompt(skill.name, skill.content, forced.rest);
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}
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}
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const mentions = extractRoutineSkillMentions(
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prompt,
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skills.map((skill) => skill.name),
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);
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if (mentions.length === 0) return prompt;
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const blocks: string[] = [];
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let remaining = prompt;
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for (const mention of mentions) {
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const skill = findSkillByName(skills, mention);
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if (!skill) continue;
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blocks.push(formatForcedSkillPrompt(skill.name, skill.content));
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// Strip the @mention token so the agent is not confused by a dangling pointer.
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remaining = remaining.replace(
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new RegExp(`(^|[\\s(,])@${escapeRegExp(skill.name)}(?=[\\s,.)]|$)`, "gi"),
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"$1",
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);
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}
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if (blocks.length === 0) return prompt;
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const rest = remaining.replace(/[ \t]{2,}/g, " ").trim();
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return [...blocks, rest].filter(Boolean).join("\n\n");
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}
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function escapeRegExp(value: string): string {
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return value.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
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}
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function stringifyScalar(value: unknown): string {
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if (value === null || value === undefined) return "";
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if (typeof value === "string") return value;
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if (typeof value === "number" || typeof value === "boolean") return String(value);
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return "";
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}
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type YamlBlockScalarHeader = {
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style: "|" | ">";
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chomp: "clip" | "strip" | "keep";
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indent: number | null;
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};
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function parseYamlBlockScalarHeader(raw: string): YamlBlockScalarHeader | null {
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const match = /^([>|])(?:([1-9]\d*)([+-]?)|([+-])([1-9]\d*)?)?$/.exec(raw);
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if (!match) return null;
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const style = match[1] as "|" | ">";
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const indentToken = match[2] ?? match[5] ?? "";
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const chompToken = match[3] || match[4] || "";
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const chomp = chompToken === "+" ? "keep" : chompToken === "-" ? "strip" : "clip";
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const indent = indentToken ? Number(indentToken) : null;
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return { style, chomp, indent };
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}
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function leadingSpaces(line: string): number {
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const match = /^( *)/.exec(line);
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return match?.[1]?.length ?? 0;
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}
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function decodeYamlBlockScalar(rawLines: string[], header: YamlBlockScalarHeader): string {
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let indent = header.indent;
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if (indent == null) {
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indent = 0;
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for (const line of rawLines) {
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if (line.trim() === "") continue;
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const spaces = leadingSpaces(line);
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if (indent === 0 || spaces < indent) indent = spaces;
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}
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}
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const contentLines = rawLines.map((line) => {
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if (line.trim() === "") return "";
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if (leadingSpaces(line) < indent!) return line.trimStart();
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return line.slice(indent!);
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});
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// Count trailing blank lines before they are folded away for chomp=keep.
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let trailingBlanks = 0;
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for (let i = contentLines.length - 1; i >= 0; i -= 1) {
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if (contentLines[i] !== "") break;
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trailingBlanks += 1;
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}
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let text: string;
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if (header.style === "|") {
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text = contentLines.join("\n");
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} else {
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// Folded (YAML 1.2 §8.1.3): same-indent lines join with spaces; empty source
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// lines become paragraph breaks; more-indented lines stay literal. Parts are
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// always joined with "\n" so folded paragraphs and indented fragments keep
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// line-break separation (never concatenated into one folded run).
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const parts: string[] = [];
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let paragraph: string[] = [];
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const flush = () => {
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if (paragraph.length === 0) return;
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parts.push(paragraph.join(" "));
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paragraph = [];
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};
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for (const line of contentLines) {
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if (line === "") {
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flush();
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parts.push("");
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continue;
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}
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if (/^ /.test(line)) {
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flush();
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||
|
|
parts.push(line);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
paragraph.push(line);
|
||
|
|
}
|
||
|
|
flush();
|
||
|
|
text = parts.join("\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
if (header.chomp === "strip") {
|
||
|
|
return text.replace(/\n+$/, "");
|
||
|
|
}
|
||
|
|
if (header.chomp === "keep") {
|
||
|
|
if (trailingBlanks === 0) return text.endsWith("\n") ? text : `${text}\n`;
|
||
|
|
const stripped = text.replace(/\n+$/, "");
|
||
|
|
return `${stripped}\n${"\n".repeat(trailingBlanks)}`;
|
||
|
|
}
|
||
|
|
// clip: exactly one trailing newline when the block had content.
|
||
|
|
const stripped = text.replace(/\n+$/, "");
|
||
|
|
return stripped === "" ? "" : `${stripped}\n`;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Minimal YAML object parser for SKILL.md frontmatter.
|
||
|
|
* Supports scalars, folded/literal block scalars (`>`, `|`, `>-`, `|+`, `|2`, …),
|
||
|
|
* inline arrays, and nested maps one level deep.
|
||
|
|
* Unrecognized lines are kept as string values under their key when possible.
|
||
|
|
*/
|
||
|
|
function parseSimpleYamlObject(text: string): Record<string, unknown> {
|
||
|
|
const result: Record<string, unknown> = {};
|
||
|
|
const lines = text.split(/\r?\n/);
|
||
|
|
let i = 0;
|
||
|
|
while (i < lines.length) {
|
||
|
|
const line = lines[i] ?? "";
|
||
|
|
if (!line.trim() || line.trimStart().startsWith("#")) {
|
||
|
|
i += 1;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (/^\s/.test(line)) {
|
||
|
|
throw new Error("Unexpected indented frontmatter line without a key.");
|
||
|
|
}
|
||
|
|
const keyed = /^([A-Za-z_][\w-]*):\s*(.*)$/.exec(line);
|
||
|
|
if (!keyed) {
|
||
|
|
throw new Error(`Invalid frontmatter line: ${line}`);
|
||
|
|
}
|
||
|
|
const key = keyed[1]!;
|
||
|
|
const raw = keyed[2] ?? "";
|
||
|
|
const blockHeader = parseYamlBlockScalarHeader(raw);
|
||
|
|
if (blockHeader) {
|
||
|
|
const blockLines: string[] = [];
|
||
|
|
i += 1;
|
||
|
|
while (i < lines.length && (/^\s+/.test(lines[i] ?? "") || (lines[i] ?? "").trim() === "")) {
|
||
|
|
blockLines.push(lines[i] ?? "");
|
||
|
|
i += 1;
|
||
|
|
}
|
||
|
|
result[key] = decodeYamlBlockScalar(blockLines, blockHeader);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (raw === "") {
|
||
|
|
// Nested map or list on following indented lines.
|
||
|
|
const nested: Record<string, unknown> = {};
|
||
|
|
const list: unknown[] = [];
|
||
|
|
let mode: "empty" | "map" | "list" = "empty";
|
||
|
|
i += 1;
|
||
|
|
while (i < lines.length && /^\s+/.test(lines[i] ?? "")) {
|
||
|
|
const nestedLine = (lines[i] ?? "").replace(/^\s+/, "");
|
||
|
|
const listItem = /^-\s+(.*)$/.exec(nestedLine);
|
||
|
|
if (listItem) {
|
||
|
|
mode = "list";
|
||
|
|
list.push(parseYamlScalar(listItem[1] ?? ""));
|
||
|
|
i += 1;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
const nestedKey = /^([A-Za-z_][\w-]*):\s*(.*)$/.exec(nestedLine);
|
||
|
|
if (nestedKey) {
|
||
|
|
mode = "map";
|
||
|
|
nested[nestedKey[1]!] = parseYamlScalar(nestedKey[2] ?? "");
|
||
|
|
i += 1;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
result[key] = mode === "list" ? list : mode === "map" ? nested : "";
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (raw.startsWith("[") && raw.endsWith("]")) {
|
||
|
|
result[key] = raw
|
||
|
|
.slice(1, -1)
|
||
|
|
.split(",")
|
||
|
|
.map((part) => parseYamlScalar(part.trim()))
|
||
|
|
.filter((part) => part !== "");
|
||
|
|
i += 1;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
result[key] = parseYamlScalar(raw);
|
||
|
|
i += 1;
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
function parseYamlScalar(raw: string): string | number | boolean {
|
||
|
|
const value = raw.trim();
|
||
|
|
if (
|
||
|
|
(value.startsWith('"') && value.endsWith('"')) ||
|
||
|
|
(value.startsWith("'") && value.endsWith("'"))
|
||
|
|
) {
|
||
|
|
return value.slice(1, -1);
|
||
|
|
}
|
||
|
|
if (value === "true") return true;
|
||
|
|
if (value === "false") return false;
|
||
|
|
if (/^-?\d+(\.\d+)?$/.test(value)) return Number(value);
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
|
||
|
|
function formatYamlBlockScalar(key: string, value: string): string {
|
||
|
|
// Choose chomp so decodeYamlBlockScalar round-trips trailing newlines:
|
||
|
|
// strip (0), clip (1), keep (2+). Folded (`>`) style is not preserved — only the string value.
|
||
|
|
const trailing = /\n*$/.exec(value)?.[0].length ?? 0;
|
||
|
|
let indicator = "|";
|
||
|
|
let lines: string[];
|
||
|
|
if (trailing === 0) {
|
||
|
|
indicator = "|-";
|
||
|
|
lines = value.split("\n");
|
||
|
|
} else if (trailing === 1) {
|
||
|
|
indicator = "|";
|
||
|
|
lines = value.slice(0, -1).split("\n");
|
||
|
|
} else {
|
||
|
|
indicator = "|+";
|
||
|
|
const core = value.slice(0, -trailing);
|
||
|
|
// keep decoder yields 1 + trailingBlanks newlines; emit trailingBlanks blank lines.
|
||
|
|
lines = [core, ...Array.from({ length: trailing - 1 }, () => "")];
|
||
|
|
}
|
||
|
|
const indented = lines.map((line) => ` ${line}`).join("\n");
|
||
|
|
return `${key}: ${indicator}\n${indented}`;
|
||
|
|
}
|
||
|
|
|
||
|
|
function formatYamlLine(key: string, value: unknown): string {
|
||
|
|
if (value === null || value === undefined) return `${key}:`;
|
||
|
|
if (typeof value === "string") {
|
||
|
|
if (value.includes("\n") || value.includes(": ")) {
|
||
|
|
return formatYamlBlockScalar(key, value);
|
||
|
|
}
|
||
|
|
if (value === "" || /[#{}[\],&*?|>!%@`]/.test(value) || value !== value.trim()) {
|
||
|
|
return `${key}: ${JSON.stringify(value)}`;
|
||
|
|
}
|
||
|
|
return `${key}: ${value}`;
|
||
|
|
}
|
||
|
|
if (typeof value === "number" || typeof value === "boolean") return `${key}: ${value}`;
|
||
|
|
if (Array.isArray(value)) {
|
||
|
|
if (value.every((item) => typeof item === "string" || typeof item === "number")) {
|
||
|
|
return `${key}: [${value.map((item) => JSON.stringify(String(item))).join(", ")}]`;
|
||
|
|
}
|
||
|
|
const items = value
|
||
|
|
.map((item) => ` - ${typeof item === "string" ? item : JSON.stringify(item)}`)
|
||
|
|
.join("\n");
|
||
|
|
return `${key}:\n${items}`;
|
||
|
|
}
|
||
|
|
if (typeof value === "object") {
|
||
|
|
const entries = Object.entries(value as Record<string, unknown>);
|
||
|
|
if (entries.length === 0) return `${key}:`;
|
||
|
|
const nested = entries
|
||
|
|
.map(([nestedKey, nestedValue]) => ` ${formatYamlLine(nestedKey, nestedValue)}`)
|
||
|
|
.join("\n");
|
||
|
|
return `${key}:\n${nested}`;
|
||
|
|
}
|
||
|
|
return `${key}: ${JSON.stringify(String(value))}`;
|
||
|
|
}
|