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feat(server): agents can schedule prompts in their threads - #14618
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| if ( | ||
| command.requireIdleAt !== undefined && | ||
| (targetThread.archivedAt !== null || | ||
| targetThread.latestTurn?.state === "running" || |
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🟠 High orchestration/decider.ts:1405
Scheduled commands can pass this idle check while targetThread.session?.status is "running" and activeTurnId is null, causing a new turn to start or steer a provider session that is still working. Include "running" alongside "starting" so every running session is treated as non-idle.
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In file @apps/server/src/orchestration/decider.ts around line 1405:
Scheduled commands can pass this idle check while `targetThread.session?.status` is `"running"` and `activeTurnId` is `null`, causing a new turn to start or steer a provider session that is still working. Include `"running"` alongside `"starting"` so every running session is treated as non-idle.
| import * as Schema from "effect/Schema"; | ||
| import { IsoDateTime, TrimmedNonEmptyString } from "./baseSchemas.ts"; | ||
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| const Timestamp = IsoDateTime.check(Schema.isPattern(/T.*(?:Z|[+-]\d{2}:\d{2})$/)); |
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🟠 High src/scheduling.ts:4
Timestamp accepts impossible calendar dates such as 2026-02-30T09:00:00Z, so a one-time prompt for that date is silently normalized by DateTime.makeUnsafe and stored or run on a different day instead of being rejected. The T/trailing-timezone pattern validates only the string shape; add strict calendar-component validation before the scheduler constructs the native Date.
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In file @packages/contracts/src/scheduling.ts around line 4:
`Timestamp` accepts impossible calendar dates such as `2026-02-30T09:00:00Z`, so a one-time prompt for that date is silently normalized by `DateTime.makeUnsafe` and stored or run on a different day instead of being rejected. The `T`/trailing-timezone pattern validates only the string shape; add strict calendar-component validation before the scheduler constructs the native `Date`.
| // Last, so no route layer can replace the server's one TracerDisabledWhen. | ||
| untracedRequestsLayer, | ||
| ).pipe( | ||
| Layer.provide(ScheduledPrompts.layer), |
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🟠 High src/server.ts:620
Cancelling a schedule through an HTTP route can be overwritten by the worker, resurrecting it as active/completed and potentially delivering a prompt after cancellation. Layer.provide(ScheduledPrompts.layer) constructs a separate service with its own mutex from the instance used by ScheduledPromptWorker, so route mutations are not serialized with runDue; provide the shared outer service instance instead.
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In file @apps/server/src/server.ts around line 620:
Cancelling a schedule through an HTTP route can be overwritten by the worker, resurrecting it as `active`/`completed` and potentially delivering a prompt after cancellation. `Layer.provide(ScheduledPrompts.layer)` constructs a separate service with its own mutex from the instance used by `ScheduledPromptWorker`, so route mutations are not serialized with `runDue`; provide the shared outer service instance instead.
ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This is a substantial production-facing scheduling workflow that adds MCP tools, persistent schema, a continuously running worker, orchestration gating, and default agent capability/instructions. It is not a small off-by-default change, and unresolved high-severity findings identify risks around session idleness, timestamp validation, and service-instance concurrency. Not approved because:
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository: pingdotgg/t3code/.coderabbit.yaml Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (9)
💤 Files with no reviewable changes (1)
🚧 Files skipped from review as they are similar to previous changes (2)
Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThis change adds one-time, delayed, interval, and cron scheduled prompts. The server persists schedules, dispatches eligible prompts to threads, and exposes create, list, and update operations through MCP. ChangesScheduled prompts
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant ScheduledPromptWorker
participant ScheduledPrompts
participant SQL
participant Orchestration
ScheduledPromptWorker->>ScheduledPrompts: runDue sweep
ScheduledPrompts->>SQL: select eligible schedules
ScheduledPrompts->>Orchestration: dispatch scheduled thread turn
ScheduledPrompts->>SQL: record dispatch and update schedule
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The scheduled-prompt feature appears ready to merge. The earlier listing concern was addressed and is covered by a test. No remaining merge-blocking issue was identified from the supplied evidence. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Deferred work can restart after a conversation is archived and reopened without the expected explicit step to resume it. Access restrictions and activity checks limit exposure, but the pause guarantee needs strengthening. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Description checkExplanation The description covers the required Problem, Change, Scope and approval, and Verification sections. It clearly states that this new feature has no prior maintainer approval link, although the template requires one. Resolution Add a link to the triaged issue or maintainer discussion containing explicit approval of the feature's direction and scope. If approval is obtained elsewhere, include the approval comment or an equivalent reference in this section before merging the pull request.
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @apps/server/src/scheduling/ScheduledPrompts.ts:
- Around line 98-121: Update list_scheduled_prompts to return every active and
paused schedule plus only the 100 newest completed or cancelled schedules,
preserving the existing response schema. Update its tool description to match
and add a regression test covering older active and paused schedules alongside
more than 100 terminal schedules.
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📒 Files selected for processing (20)
apps/server/src/mcp/McpHttpServer.tsapps/server/src/mcp/McpInvocationContext.tsapps/server/src/mcp/McpSessionRegistry.test.tsapps/server/src/mcp/McpSessionRegistry.tsapps/server/src/mcp/toolkits/scheduling/handlers.tsapps/server/src/mcp/toolkits/scheduling/tools.tsapps/server/src/orchestration/decider.tsapps/server/src/orchestration/decider.userMessageAppend.test.tsapps/server/src/persistence/Migrations.tsapps/server/src/persistence/Migrations/055_ScheduledPrompts.tsapps/server/src/provider/RuntimeInstructions.tsapps/server/src/scheduling/ScheduledPromptWorker.test.tsapps/server/src/scheduling/ScheduledPromptWorker.tsapps/server/src/scheduling/ScheduledPrompts.test.tsapps/server/src/scheduling/ScheduledPrompts.tsapps/server/src/server.tsdocs/user/composer.mdpackages/contracts/src/index.tspackages/contracts/src/orchestration.tspackages/contracts/src/scheduling.ts
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Note This comment is posted by Julius' dot This introduces a new agent-scheduling workflow: persistent schedules, scheduling MCP tools, and a worker that starts future turns. The PR's “Scope and approval” section explicitly says no prior maintainer approval is available, and there is no approval in the discussion or reviews. Under prior approval, this PR is being closed. Please agree on the direction and scope with maintainers in an Ideas discussion and link their explicit approval before requesting reconsideration. The need to revisit work later is clear, and the focused tests are useful, but they do not replace product-direction approval. |
Problem
Agents cannot arrange a future turn in the same thread when a user asks “check this in two hours” or “check this every three hours.” They need a durable schedule that sends a saved prompt into that chat without an open client.
Change
Add thread-scoped MCP tools to create, list, pause, resume, and cancel scheduled prompts. Schedules support a one-time timestamp, a delay, a fixed interval, or a five-field cron expression with an explicit time zone.
A SQLite-backed worker delivers due prompts through normal orchestration commands using the thread's current model and permission mode. Schedules survive server restarts, coalesce missed occurrences, and wait for active turns or pending requests. A serialized command check prevents scheduled prompts from steering concurrent work, and durable command receipts deduplicate delivery if the schedule update fails. Archived or deleted threads pause their schedules.
The shared MCP injection path exposes these tools to all six providers. Web, desktop, mobile, and remote clients receive the resulting messages through the existing thread flow. Runtime instructions teach agents to use the tools, and the composer guide explains scheduling and the requirement to keep the hosting server running.
Scope and approval
This PR implements one feature: agent-created scheduled prompts in the originating thread. It was requested by the contributor; no prior maintainer approval link is available. This is a new feature and requires maintainer approval under CONTRIBUTING.md.
Verification
vp test run apps/server/src/scheduling/ScheduledPrompts.test.ts apps/server/src/scheduling/ScheduledPromptWorker.test.ts apps/server/src/orchestration/decider.userMessageAppend.test.ts apps/server/src/mcp/McpSessionRegistry.test.ts apps/server/src/provider/RuntimeInstructions.test.ts— 28 tests passed. Covers one-time delivery, service reconstruction over persisted state, missed recurring runs, pause/resume/cancel, thread ownership, pending requests, archival, retry after rejection, deduplication after a failed schedule update, cron daylight-saving transitions, MCP access and lifecycle, and worker startup/shutdown.vp test run apps/server/src/server.test.ts -t 'serves snapshots for MCP handoff'— one server routing integration test passed with the new service dependencies.git diff --checkpassed.No browser, desktop, native mobile, or live-provider manual verification was performed. This PR adds server and agent tooling, without new client UI.
Implemented with GPT-6.1-Sol through the Codex harness in T3 Code.