scheduler: add phantom_schedule update action so editing a job preserves run history (#86)

src/scheduler/__tests__/service.test.ts

@@ -444,6 +444,97 @@ describe("Scheduler", () => {
 		expect(row.enabled).toBe(0);
 	});
 
+	test("updateJob changes task in place and preserves run history", async () => {
+		const scheduler = new Scheduler({ db, runtime: mockRuntime as never });
+		const job = scheduler.createJob({
+			name: "TaskEditable",
+			schedule: { kind: "every", intervalMs: 60_000 },
+			task: "Original task text",
+		});
+		// Run once so run_count and last_run_at are populated. The point of
+		// the update path is that this history survives a task edit.
+		await scheduler.runJobNow(job.id);
+		const before = scheduler.getJob(job.id);
+		expect(before?.runCount).toBe(1);
+		expect(before?.lastRunAt).toBeTruthy();
+
+		const updated = scheduler.updateJob(job.id, { task: "New task text" });
+		expect(updated?.task).toBe("New task text");
+		expect(updated?.runCount).toBe(1);
+		expect(updated?.lastRunAt).toBe(before?.lastRunAt ?? null);
+		expect(updated?.id).toBe(job.id);
+	});
+
+	test("updateJob recomputes next_run_at when schedule changes", () => {
+		const scheduler = new Scheduler({ db, runtime: mockRuntime as never });
+		const job = scheduler.createJob({
+			name: "ScheduleEditable",
+			schedule: { kind: "every", intervalMs: 24 * 60 * 60 * 1000 },
+			task: "Daily",
+		});
+		const originalNext = job.nextRunAt ? new Date(job.nextRunAt).getTime() : 0;
+
+		const updated = scheduler.updateJob(job.id, {
+			schedule: { kind: "every", intervalMs: 60_000 },
+		});
+		expect(updated?.schedule).toEqual({ kind: "every", intervalMs: 60_000 });
+		const newNext = updated?.nextRunAt ? new Date(updated.nextRunAt).getTime() : 0;
+		expect(newNext).toBeLessThan(originalNext);
+		expect(newNext).toBeGreaterThan(Date.now() - 5_000);
+		expect(newNext).toBeLessThan(Date.now() + 120_000);
+	});
+
+	test("updateJob can flip enabled to false and back to true", () => {
+		const scheduler = new Scheduler({ db, runtime: mockRuntime as never });
+		const job = scheduler.createJob({
+			name: "EnabledToggle",
+			schedule: { kind: "every", intervalMs: 60_000 },
+			task: "Toggle me",
+		});
+		expect(job.enabled).toBe(true);
+
+		const disabled = scheduler.updateJob(job.id, { enabled: false });
+		expect(disabled?.enabled).toBe(false);
+
+		const enabled = scheduler.updateJob(job.id, { enabled: true });
+		expect(enabled?.enabled).toBe(true);
+	});
+
+	test("updateJob can change delivery target", () => {
+		const scheduler = new Scheduler({ db, runtime: mockRuntime as never });
+		const job = scheduler.createJob({
+			name: "DeliveryEditable",
+			schedule: { kind: "every", intervalMs: 60_000 },
+			task: "Deliver",
+		});
+		expect(job.delivery).toEqual({ channel: "slack", target: "owner" });
+
+		const updated = scheduler.updateJob(job.id, {
+			delivery: { channel: "slack", target: "C04ABC123" },
+		});
+		expect(updated?.delivery).toEqual({ channel: "slack", target: "C04ABC123" });
+	});
+
+	test("updateJob rejects an invalid slack target", () => {
+		const scheduler = new Scheduler({ db, runtime: mockRuntime as never });
+		const job = scheduler.createJob({
+			name: "BadTargetReject",
+			schedule: { kind: "every", intervalMs: 60_000 },
+			task: "Try bad target",
+		});
+		expect(() =>
+			scheduler.updateJob(job.id, {
+				delivery: { channel: "slack", target: "#general" },
+			}),
+		).toThrow(/invalid delivery.target/);
+	});
+
+	test("updateJob returns null for unknown id", () => {
+		const scheduler = new Scheduler({ db, runtime: mockRuntime as never });
+		const result = scheduler.updateJob("does-not-exist", { task: "anything" });
+		expect(result).toBeNull();
+	});
+
 	test("paused job is excluded from the armTimer MIN query", async () => {
 		const scheduler = new Scheduler({ db, runtime: mockRuntime as never });
 		await scheduler.start();

src/scheduler/__tests__/tool.test.ts

@@ -2,6 +2,7 @@ import { Database } from "bun:sqlite";
 import { afterAll, beforeAll, beforeEach, describe, expect, mock, test } from "bun:test";
 import { runMigrations } from "../../db/migrate.ts";
 import { Scheduler } from "../service.ts";
+import { JobUpdateInputSchema } from "../tool-schema.ts";
 import { createSchedulerToolServer } from "../tool.ts";
 
 function createMockRuntime() {
@@ -106,4 +107,28 @@ describe("createSchedulerToolServer", () => {
 		expect(mcpServers["phantom-scheduler"].type).toBe("sdk");
 		expect(mcpServers["phantom-scheduler"].name).toBe("phantom-scheduler");
 	});
+
+	test("update action via scheduler edits a job by name", () => {
+		const job = scheduler.createJob({
+			name: "Editable",
+			schedule: { kind: "every", intervalMs: 60_000 },
+			task: "Original",
+		});
+		const targetId = scheduler.findJobIdByName("Editable");
+		expect(targetId).toBe(job.id);
+
+		const updated = scheduler.updateJob(targetId as string, { task: "Edited" });
+		expect(updated?.task).toBe("Edited");
+		expect(updated?.id).toBe(job.id);
+	});
+
+	test("JobUpdateInputSchema rejects an empty partial", () => {
+		const result = JobUpdateInputSchema.safeParse({});
+		expect(result.success).toBe(false);
+	});
+
+	test("JobUpdateInputSchema accepts a single-field partial", () => {
+		const result = JobUpdateInputSchema.safeParse({ task: "Just the task" });
+		expect(result.success).toBe(true);
+	});
 });

src/scheduler/service.ts

@@ -7,8 +7,9 @@ import { executeJob } from "./executor.ts";
 import { type SchedulerHealthSummary, computeHealthSummary } from "./health.ts";
 import { cleanupOldTerminalJobs, staggerMissedJobs } from "./recovery.ts";
 import { rowToJob } from "./row-mapper.ts";
-import { computeNextRunAt, serializeScheduleValue } from "./schedule.ts";
-import type { JobCreateInput, JobRow, ScheduledJob } from "./types.ts";
+import { computeNextRunAt, serializeScheduleValue, validateSchedule } from "./schedule.ts";
+import type { JobUpdateInputParsed } from "./tool-schema.ts";
+import { type JobCreateInput, type JobRow, type ScheduledJob, isValidSlackTarget } from "./types.ts";
 
 // Upper bound on the setTimeout delay we pass when arming the next wake-up.
 // Both Node and Bun use a 32-bit signed integer for the setTimeout delay, so
@@ -180,6 +181,82 @@ export class Scheduler {
 		return this.getJob(id);
 	}
 
+	/**
+	 * Edit a job's user-authored columns in place. History is preserved:
+	 * last_run_at, last_run_status, run_count, consecutive_errors, created_at,
+	 * and the stable `id` are never touched. The caller chooses which subset
+	 * of {task, description, schedule, delivery, enabled} to change; the
+	 * refine() on JobUpdateInputSchema enforces that at least one is present,
+	 * so an empty partial here is treated as a no-op (defense in depth).
+	 *
+	 * When `schedule` changes we recompute next_run_at via the same
+	 * computeNextRunAt path resumeJob uses, then armTimer() so a schedule
+	 * that pulls the next fire earlier wakes the timer in time. Returns the
+	 * fresh row, or null if `id` does not exist.
+	 */
+	updateJob(id: string, partial: JobUpdateInputParsed): ScheduledJob | null {
+		const job = this.getJob(id);
+		if (!job) return null;
+
+		const sets: string[] = [];
+		const params: Array<string | number | null> = [];
+
+		if (partial.task !== undefined) {
+			sets.push("task = ?");
+			params.push(partial.task);
+		}
+
+		if (partial.description !== undefined) {
+			sets.push("description = ?");
+			params.push(partial.description);
+		}
+
+		if (partial.delivery !== undefined) {
+			// Mirror create-validation's slack-target check so an update cannot
+			// install a malformed target the create path would have rejected.
+			if (partial.delivery.channel === "slack" && !isValidSlackTarget(partial.delivery.target)) {
+				throw new Error(
+					`invalid delivery.target '${partial.delivery.target}': must be "owner", a Slack channel id (C...), or a Slack user id (U...)`,
+				);
+			}
+			sets.push("delivery_channel = ?");
+			params.push(partial.delivery.channel);
+			sets.push("delivery_target = ?");
+			params.push(partial.delivery.target);
+		}
+
+		if (partial.enabled !== undefined) {
+			sets.push("enabled = ?");
+			params.push(partial.enabled ? 1 : 0);
+		}
+
+		if (partial.schedule !== undefined) {
+			const scheduleError = validateSchedule(partial.schedule);
+			if (scheduleError) {
+				throw new Error(`invalid schedule: ${scheduleError}`);
+			}
+			const nextRun = computeNextRunAt(partial.schedule);
+			const nextRunIso = nextRun ? nextRun.toISOString() : null;
+			sets.push("schedule_kind = ?");
+			params.push(partial.schedule.kind);
+			sets.push("schedule_value = ?");
+			params.push(serializeScheduleValue(partial.schedule));
+			sets.push("next_run_at = ?");
+			params.push(nextRunIso);
+		}
+
+		if (sets.length === 0) {
+			return job;
+		}
+
+		sets.push("updated_at = datetime('now')");
+		params.push(id);
+
+		this.db.run(`UPDATE scheduled_jobs SET ${sets.join(", ")} WHERE id = ?`, params);
+		this.armTimer();
+		return this.getJob(id);
+	}
+
 	/**
 	 * Defensive read: one corrupt row (a future kind, a truncated write) must
 	 * not brick the whole list. Bad rows are logged and skipped. See M8.

src/scheduler/tool-schema.ts

@@ -29,3 +29,34 @@ export const JobCreateInputSchema = z.object({
 });
 
 export type JobCreateInputParsed = z.infer<typeof JobCreateInputSchema>;
+
+// Partial-update shape for Scheduler.updateJob. All fields optional with a
+// refine() that rejects an empty object so the caller cannot silently no-op.
+// Excludes identity columns (name, createdBy) and history columns
+// (last_run_*, run_count, consecutive_errors, created_at): name is the
+// human-readable lookup handle and renaming mid-life breaks cross-references,
+// history is owned by the executor and would erase the run trail an update
+// is supposed to preserve.
+export const JobUpdateInputSchema = z
+	.object({
+		description: z.string().max(1000).optional(),
+		schedule: ScheduleInputSchema.optional(),
+		task: z
+			.string()
+			.min(1)
+			.max(32 * 1024)
+			.optional(),
+		delivery: JobDeliverySchema.optional(),
+		enabled: z.boolean().optional(),
+	})
+	.refine(
+		(v) =>
+			v.description !== undefined ||
+			v.schedule !== undefined ||
+			v.task !== undefined ||
+			v.delivery !== undefined ||
+			v.enabled !== undefined,
+		{ message: "update requires at least one of: description, schedule, task, delivery, enabled" },
+	);
+
+export type JobUpdateInputParsed = z.infer<typeof JobUpdateInputSchema>;

src/scheduler/tool.ts

@@ -2,7 +2,7 @@ import { createSdkMcpServer, tool } from "@anthropic-ai/claude-agent-sdk";
 import type { McpSdkServerConfigWithInstance } from "@anthropic-ai/claude-agent-sdk";
 import { z } from "zod";
 import type { Scheduler } from "./service.ts";
-import { ScheduleInputSchema } from "./tool-schema.ts";
+import { JobUpdateInputSchema, ScheduleInputSchema } from "./tool-schema.ts";
 import { JobDeliverySchema } from "./types.ts";
 
 function ok(data: Record<string, unknown>): { content: Array<{ type: "text"; text: string }> } {
@@ -13,11 +13,12 @@ function err(message: string): { content: Array<{ type: "text"; text: string }>;
 	return { content: [{ type: "text" as const, text: JSON.stringify({ error: message }) }], isError: true };
 }
 
-const TOOL_DESCRIPTION = `Create, list, delete, or trigger scheduled tasks. Lets you set up recurring jobs, one-shot reminders, and automated reports.
+const TOOL_DESCRIPTION = `Create, list, update, delete, or trigger scheduled tasks. Lets you set up recurring jobs, one-shot reminders, and automated reports.
 
 Actions:
 - create: Create a new scheduled task. Returns the job id and next run time. Rejects invalid schedules, past timestamps, duplicate names, task text over 32 KB, and delivery targets that are not "owner", a channel id (C...), or a user id (U...).
 - list: List all scheduled tasks with status and next run time. Corrupt rows are logged and skipped.
+- update: Edit task, description, schedule, delivery, or enabled on an existing job by jobId or name. Run history (last_run_at, run_count, consecutive_errors) and the stable jobId are preserved. If schedule changes, next_run_at is recomputed. Requires at least one field; name is not editable.
 - delete: Remove a scheduled task by jobId or by name (case insensitive).
 - run: Trigger a task immediately. Only runs when status is active and no other job is currently executing. Returns the task output.
 
@@ -60,19 +61,25 @@ export function createSchedulerToolServer(scheduler: Scheduler): McpSdkServerCon
 		TOOL_DESCRIPTION,
 		{
 			action: z
-				.enum(["create", "list", "delete", "run"])
+				.enum(["create", "list", "update", "delete", "run"])
 				.describe(
-					"create: new scheduled task. list: enumerate tasks. delete: remove by jobId or name. run: trigger immediately (only when status=active and scheduler is idle).",
+					"create: new scheduled task. list: enumerate tasks. update: edit user-authored fields by jobId or name (preserves run history). delete: remove by jobId or name. run: trigger immediately (only when status=active and scheduler is idle).",
 				),
-			name: z.string().optional().describe("Job name (required for create)"),
+			name: z.string().optional().describe("Job name (required for create; lookup key for update, delete, run)"),
 			description: z.string().optional().describe("Job description"),
-			schedule: ScheduleInputSchema.optional().describe("Schedule definition (required for create)"),
+			schedule: ScheduleInputSchema.optional().describe(
+				"Schedule definition (required for create, optional for update)",
+			),
 			task: z
 				.string()
 				.optional()
-				.describe("The prompt for the agent when the job fires (required for create, 32 KB max)"),
+				.describe("The prompt for the agent when the job fires (required for create, optional for update, 32 KB max)"),
 			delivery: JobDeliverySchema.optional().describe("Where to deliver results"),
-			jobId: z.string().optional().describe("Job ID (for delete or run)"),
+			enabled: z
+				.boolean()
+				.optional()
+				.describe("Whether the job fires (optional for update; pause/resume manage status separately)"),
+			jobId: z.string().optional().describe("Job ID (for update, delete, or run)"),
 		},
 		async (input) => {
 			try {
@@ -123,6 +130,38 @@ export function createSchedulerToolServer(scheduler: Scheduler): McpSdkServerCon
 						});
 					}
 
+					case "update": {
+						const targetId = input.jobId ?? scheduler.findJobIdByName(input.name);
+						if (!targetId) return err("Provide jobId or name to update");
+
+						const partialResult = JobUpdateInputSchema.safeParse({
+							description: input.description,
+							schedule: input.schedule,
+							task: input.task,
+							delivery: input.delivery,
+							enabled: input.enabled,
+						});
+						if (!partialResult.success) {
+							return err(partialResult.error.issues.map((i) => i.message).join("; "));
+						}
+
+						const updated = scheduler.updateJob(targetId, partialResult.data);
+						if (!updated) return err(`Job not found: ${targetId}`);
+
+						return ok({
+							updated: true,
+							id: updated.id,
+							name: updated.name,
+							schedule: updated.schedule,
+							task: updated.task,
+							description: updated.description,
+							delivery: updated.delivery,
+							enabled: updated.enabled,
+							nextRunAt: updated.nextRunAt,
+							runCount: updated.runCount,
+						});
+					}
+
 					case "delete": {
 						const targetId = input.jobId ?? scheduler.findJobIdByName(input.name);
 						if (!targetId) return err("Provide jobId or name to delete");