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perf(server): running or editing one scheduled task over MCP no longer loads every task - #28766
To run one scheduled task, run_scheduled_task_now first loaded and decoded every scheduled task to check that the id exists. schedule_task updates and delete_scheduled_task did the same before their mode checks. The cost grows with the number of tasks. Worse, one row that fails to decode breaks these tools for every other task, even though the targeted task is fine.
Change
ScheduledTaskService already had a private one-row lookup by primary key (findTask, used by runNow, setEnabled and the others). It is now exposed as find. The two MCP call sites use it in place of list() plus a scan:
run_scheduled_task_now in mcp/toolkits/thread/handlers.ts
loadScheduledTask in OrchestratorMcpService.ts, which backs schedule_task updates and delete_scheduled_task
These are unchanged: the missing-task invalid_request, the webhook refusal text from #25647, the access and mode checks, and the hiding of storage errors. list and the Settings list are untouched.
runNow still loads the task again after the precheck, so two one-row reads replace a full scan plus one read. Folding the not-found case into runNow would remove the extra read, but it means a new error in the ScheduledTaskError RPC contract that web and mobile share. That is not worth about 0.02 ms.
Scope and approval
This qualifies as a small, focused fix for an obvious defect, without a prior issue. It preserves task semantics, access checks and wire contracts while avoiding unrelated-row decode failures. The one visible text change: when storage fails during an update or delete, the error detail now reads "Could not load scheduled task: Could not load schedule task." instead of "...: Could not list schedule tasks." No UI changes, because no screen calls these MCP tools or shows their results.
Verification
core.test.ts table for run_scheduled_task_now, with list mocked to fail the test if called. It covers an existing id, a missing id, the webhook refusal, and a storage failure that must stay hidden. All four rows fail on main and pass here.
In OrchestratorMcpService.test.ts, the update cases now mock only find. Two fail on main and pass here.
vp run check:changed: format, lint, knip, typecheck and tests (9 files, 161 tests) pass.
Scaling, measured with a throwaway test (not committed) against the real ScheduledTaskService on in-memory SQLite. Median of 30 calls on the same machine in one run; the target task is the last row:
Tasks
Before: list() + scan
After: find
100
2.58 ms
0.033 ms
1,000
20.2 ms
0.025 ms
10,000
200.1 ms
0.024 ms
With one unrelated row given an undecodable schedule_json, the old lookup fails with "Could not list schedule tasks." The new one still finds the target.
Not checked:
A real client run. No client screen uses these MCP tools, so there are no screenshots.
Timings on a production-sized on-disk database. The numbers above use in-memory SQLite.
…sting all
run_scheduled_task_now, and schedule_task updates and deletes, loaded and
decoded every scheduled task to find one id. Expose the service's existing
single-row lookup as `find` and use it, so these calls no longer scale with
the task count or fail when an unrelated row cannot be decoded.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Macroscope's review found this PR approvable — MCP task operations now load only the requested scheduled task rather than decoding the entire list. Existing access checks and execution behavior remain unchanged, keeping the performance improvement narrowly scoped.
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The scheduled-task service adds direct lookup by ID. MCP orchestration and run-now paths use that lookup instead of listing tasks to find a match. Tests cover the updated call sites and lookup outcomes.
Changes: Scheduled-task lookup
Layer / File(s)
Summary
Add scheduled-task lookup API apps/server/src/scheduledTasks/ScheduledTaskService.ts
ScheduledTaskService adds find(id), which returns a task or null. Its implementation uses the existing findTask helper.
Use lookup in MCP orchestration apps/server/src/mcp/OrchestratorMcpService.ts, apps/server/src/mcp/OrchestratorMcpService.test.ts, apps/server/src/mcp/OrchestratorMcpService.activity.test.ts, apps/server/src/mcp/OrchestratorMcpToolkit.integration.test.ts
loadScheduledTask retrieves tasks by ID and preserves its error mapping. Related test mocks and stubs implement find.
Use lookup in scheduled-task run flow apps/server/src/mcp/toolkits/thread/handlers.ts, apps/server/src/mcp/toolkits/core.test.ts
The run-now handler checks for a task with find. Tests cover successful runs, webhook-task rejection, missing tasks, and lookup failures.
The lookup change is mergeable; adding a real-storage regression test would improve confidence.
Pre-merge checks: 4
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Explanation
Title check
The title clearly describes the main change: scheduled-task MCP operations now avoid loading every task. It is specific and uses a conventional commit format.
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Add a real-storage test for the public find operation.
findTask already uses an ID-filtered query, but the head exposes it as ScheduledTaskService.find and the service tests do not call that operation. The MCP tests mock find; they cover caller wiring, but not the real service behavior.
Add a case with one valid row and one unrelated malformed row. Assert that find(validId) returns the valid task and find(missingId) returns null. This protects the storage lookup contract, although the helper behavior itself predates this PR.
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Review comment at @apps/server/src/scheduledTasks/ScheduledTaskService.ts at
line 2339:
Add a real-storage service test for the public ScheduledTaskService.find
operation, using one valid row and one unrelated malformed row. Assert that
find(validId) returns the valid task and find(missingId) returns null; do not
rely on the MCP tests that mock find.
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size:S10-29 changed lines (additions + deletions).vouch:unvouchedPR author is not yet trusted in the VOUCHED list.
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Problem
To run one scheduled task,
run_scheduled_task_nowfirst loaded and decoded every scheduled task to check that the id exists.schedule_taskupdates anddelete_scheduled_taskdid the same before their mode checks. The cost grows with the number of tasks. Worse, one row that fails to decode breaks these tools for every other task, even though the targeted task is fine.Change
ScheduledTaskServicealready had a private one-row lookup by primary key (findTask, used byrunNow,setEnabledand the others). It is now exposed asfind. The two MCP call sites use it in place oflist()plus a scan:run_scheduled_task_nowinmcp/toolkits/thread/handlers.tsloadScheduledTaskinOrchestratorMcpService.ts, which backsschedule_taskupdates anddelete_scheduled_taskThese are unchanged: the missing-task
invalid_request, the webhook refusal text from #25647, the access and mode checks, and the hiding of storage errors.listand the Settings list are untouched.runNowstill loads the task again after the precheck, so two one-row reads replace a full scan plus one read. Folding the not-found case intorunNowwould remove the extra read, but it means a new error in theScheduledTaskErrorRPC contract that web and mobile share. That is not worth about 0.02 ms.Scope and approval
This qualifies as a small, focused fix for an obvious defect, without a prior issue. It preserves task semantics, access checks and wire contracts while avoiding unrelated-row decode failures. The one visible text change: when storage fails during an update or delete, the error detail now reads "Could not load scheduled task: Could not load schedule task." instead of "...: Could not list schedule tasks." No UI changes, because no screen calls these MCP tools or shows their results.
Verification
core.test.tstable forrun_scheduled_task_now, withlistmocked to fail the test if called. It covers an existing id, a missing id, the webhook refusal, and a storage failure that must stay hidden. All four rows fail onmainand pass here.In
OrchestratorMcpService.test.ts, the update cases now mock onlyfind. Two fail onmainand pass here.vp run check:changed: format, lint, knip, typecheck and tests (9 files, 161 tests) pass.Scaling, measured with a throwaway test (not committed) against the real
ScheduledTaskServiceon in-memory SQLite. Median of 30 calls on the same machine in one run; the target task is the last row:list()+ scanfindWith one unrelated row given an undecodable
schedule_json, the old lookup fails with "Could not list schedule tasks." The new one still finds the target.Not checked:
Prior PRs
run_scheduled_task_nowexplain why a run was refused. This keeps those messages as they are.schedule_taskcreate-replay path. The two merge cleanly, and that lookup could usefindonce both land.Generated with Claude Opus 5.5 and GPT-6.1 Sol in T3 Code Nightly