Add MCP `compile_route` tool by lukesandberg · Pull Request #93337 · vercel/next.js

lukesandberg · 2026-04-29T00:12:49Z

What?

Adds a compile_route MCP tool that triggers on-demand compilation of a specific route (app or pages) without issuing an HTTP request, and returns any compilation issues.

Why?

Coding agents and benchmarking workflows need a way to warm the module graph or measure compile time for a route without standing up a live backend to satisfy the request. The existing path — hitting the URL — requires the route's runtime dependencies to be available and couples compile timing to request handling.

How?

New tool mcp/compile_route registered in get-or-create-mcp-server.ts, backed by a compileRoute({ page, clientOnly }) callback plumbed from the Turbopack hot reloader
Reuses the dev server's existing on-demand entry path (ensurePage / handleRouteType), so the call path matches a first navigation.
Adds a subscribeToChanges opt-out on ensurePage and threads it through handleRouteType / handlePagesErrorRoute. One-shot MCP compilations skip HMR subscription wiring — without this, each call would leak a subscription that fires on every subsequent file change for the life of the dev server.
Telemetry: registers mcp/compile_route in the McpToolName union.
e2e test in test/development/mcp-server/mcp-server-compile-route.test.ts.

lukesandberg · 2026-04-29T00:13:07Z

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

[turbopack] Add trace metadata about the persist size #93339
[turbopack-trace-server] Add memory samples to the mcp tool results #93338
Add MCP compile_route tool #93337 👈 (View in Graphite)
Proof of concept: task eviction after snapshot for turbo-tasks-backend #91790 : 1 other dependent PR (#92951 )
turbo-tasks-backend: fix snapshot coordination races + extract SnapshotCoordinator #93416
canary

This stack of pull requests is managed by Graphite. Learn more about stacking.

github-actions · 2026-04-29T00:38:16Z

Failing test suites

Commit: 1d1d1b7 | About building and testing Next.js

pnpm test-dev test/e2e/filesystem-cache/evict-after-snapshot.test.ts (job)

evict-after-snapshot > should serve correct content after eviction and HMR (DD)
evict-after-snapshot > should handle client component HMR after eviction (DD)

Expand output

● evict-after-snapshot › should serve correct content after eviction and HMR

expect(received).toBe(expected) // Object.is equality

Expected: "cycle 2"
Received: "cycle 1"

  55 |         const expected = currentContent
  56 |         await retry(async () => {
> 57 |           expect(await browser.elementByCss('p').text()).toBe(expected)
     |                                                          ^
  58 |         }, 10000)
  59 |       }
  60 |

  at toBe (e2e/filesystem-cache/evict-after-snapshot.test.ts:57:58)
  at retry (lib/next-test-utils.ts:862:14)
  at Object.<anonymous> (e2e/filesystem-cache/evict-after-snapshot.test.ts:56:9)

● evict-after-snapshot › should handle client component HMR after eviction

expect(received).toBe(expected) // Object.is equality

Expected: "hello eviction"
Received: "hello world"

  78 |         async () => {
  79 |           await retry(async () => {
> 80 |             expect(await browser.elementByCss('p').text()).toBe(
     |                                                            ^
  81 |               'hello eviction'
  82 |             )
  83 |           }, 10000)

  at toBe (e2e/filesystem-cache/evict-after-snapshot.test.ts:80:60)
  at retry (lib/next-test-utils.ts:862:14)
  at e2e/filesystem-cache/evict-after-snapshot.test.ts:79:11
  at NextDevInstance.patchFile (lib/next-modes/base.ts:756:9)
  at NextDevInstance.patchFile (lib/next-modes/next-dev.ts:304:16)
  at Object.<anonymous> (e2e/filesystem-cache/evict-after-snapshot.test.ts:75:7)

pnpm test-start test/e2e/app-dir/next-after-app-static/build-time/build-time.test.ts (job)

after() in static pages > runs after during build (DD)

Expand output

● after() in static pages › runs after during build

can not run export while server is running, use next.stop() first

  251 |   ) {
  252 |     if (this.childProcess) {
> 253 |       throw new Error(
      |             ^
  254 |         `can not run export while server is running, use next.stop() first`
  255 |       )
  256 |     }

  at NextStartInstance.build (lib/next-modes/next-start.ts:253:13)
  at Object.build (e2e/app-dir/next-after-app-static/build-time/build-time.test.ts:36:36)

pnpm test-dev-turbo test/e2e/filesystem-cache/evict-after-snapshot.test.ts (turbopack) (job)

evict-after-snapshot > should serve correct content after eviction and HMR (DD)
evict-after-snapshot > should handle client component HMR after eviction (DD)

Expand output

● evict-after-snapshot › should serve correct content after eviction and HMR

expect(received).toBe(expected) // Object.is equality

Expected: "cycle 2"
Received: "cycle 1"

  55 |         const expected = currentContent
  56 |         await retry(async () => {
> 57 |           expect(await browser.elementByCss('p').text()).toBe(expected)
     |                                                          ^
  58 |         }, 10000)
  59 |       }
  60 |

  at toBe (e2e/filesystem-cache/evict-after-snapshot.test.ts:57:58)
  at retry (lib/next-test-utils.ts:862:14)
  at Object.<anonymous> (e2e/filesystem-cache/evict-after-snapshot.test.ts:56:9)

● evict-after-snapshot › should handle client component HMR after eviction

expect(received).toBe(expected) // Object.is equality

Expected: "hello eviction"
Received: "hello world"

  78 |         async () => {
  79 |           await retry(async () => {
> 80 |             expect(await browser.elementByCss('p').text()).toBe(
     |                                                            ^
  81 |               'hello eviction'
  82 |             )
  83 |           }, 10000)

  at toBe (e2e/filesystem-cache/evict-after-snapshot.test.ts:80:60)
  at retry (lib/next-test-utils.ts:862:14)
  at e2e/filesystem-cache/evict-after-snapshot.test.ts:79:11
  at NextDevInstance.patchFile (lib/next-modes/base.ts:756:9)
  at NextDevInstance.patchFile (lib/next-modes/next-dev.ts:304:16)
  at Object.<anonymous> (e2e/filesystem-cache/evict-after-snapshot.test.ts:75:7)

github-actions · 2026-04-29T01:57:09Z

Stats from current PR

🔴 3 regressions

Metric	Canary	PR	Change	Trend
node_modules Size	494 MB	494 MB	🔴 +133 kB (+0%)	█████
Webpack Build Time	23.051s	23.592s	🔴 +541ms (+2%)	▂▅▁▄▃
Webpack Build Time (cached)	22.863s	23.607s	🔴 +744ms (+3%)	▂▆▁█▅

📊 All Metrics

📖 Metrics Glossary

Dev Server Metrics:

Listen = TCP port starts accepting connections
First Request = HTTP server returns successful response
Cold = Fresh build (no cache)
Warm = With cached build artifacts

Build Metrics:

Fresh = Clean build (no .next directory)
Cached = With existing .next directory

Change Thresholds:

Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
Size: Changes < 1KB AND < 1% are insignificant
All other changes are flagged to catch regressions

⚡ Dev Server

Metric	Canary	PR	Change	Trend
Cold (Listen)	710ms	710ms	✓	▇▃▁▇▅
Cold (Ready in log)	710ms	707ms	✓	▄▂▂▅▃
Cold (First Request)	1.199s	1.202s	✓	▆▂▂▄▃
Warm (Listen)	710ms	710ms	✓	▁▁▁▁▁
Warm (Ready in log)	709ms	710ms	✓	▄▂▂▄▃
Warm (First Request)	565ms	565ms	✓	▇▃▃▇▅

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	761ms	761ms	✓	▁█▃█▃
Cold (Ready in log)	747ms	730ms	✓	▆▁▁▄▆
Cold (First Request)	3.164s	3.095s	✓	▆▂▄▅▅
Warm (Listen)	762ms	760ms	✓	▁▃▃█▆
Warm (Ready in log)	741ms	735ms	✓	▅▃▁▅▆
Warm (First Request)	3.140s	3.100s	✓	▆▁▃█▅

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.768s	4.758s	✓	▆▁▂▂▄
Cached Build	4.757s	4.752s	✓	▆▁▁▃▂

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	23.051s	23.592s	🔴 +541ms (+2%)	▂▅▁▄▃
Cached Build	22.863s	23.607s	🔴 +744ms (+3%)	▂▆▁█▅
node_modules Size	494 MB	494 MB	🔴 +133 kB (+0%)	█████

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

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Server

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	Canary	PR	Change
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Total	725 B	715 B	✅ -10 B

Build Details

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	Canary	PR	Change
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Total	435 B	428 B	✅ -7 B

📦 Webpack

Client

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Build Details

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🔄 Shared (bundler-independent)

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📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/4901a27ee68ce521927734372d5cf3b46f2496e9/next

Commit: 4901a27

lukesandberg mentioned this pull request Apr 29, 2026

Proof of concept: task eviction after snapshot for turbo-tasks-backend #91790

Open

github-actions Bot added created-by: Turbopack team PRs by the Turbopack team. Documentation Related to Next.js' official documentation. tests type: next labels Apr 29, 2026

lukesandberg changed the title ~~compile route mcsp handler~~ Compile route mcp tool Apr 29, 2026

lukesandberg changed the title ~~Compile route mcp tool~~ Add MCP compile_route tool Apr 29, 2026

lukesandberg marked this pull request as ready for review April 29, 2026 00:14

lukesandberg requested a review from gaojude April 29, 2026 00:14

lukesandberg force-pushed the compile_route_mcp_handler branch from c21addb to 93f92ea Compare April 29, 2026 01:25

lukesandberg force-pushed the eviction_semantics_for_real_this_time branch from 1e85dc1 to 7a4059f Compare April 30, 2026 22:54

lukesandberg force-pushed the compile_route_mcp_handler branch 2 times, most recently from 9f379f5 to 18e3b1d Compare May 1, 2026 18:52

lukesandberg force-pushed the eviction_semantics_for_real_this_time branch from 7a4059f to 1f9c55d Compare May 1, 2026 18:52

lukesandberg force-pushed the compile_route_mcp_handler branch from 18e3b1d to 8261a35 Compare May 1, 2026 22:44

lukesandberg force-pushed the eviction_semantics_for_real_this_time branch from 1f9c55d to 5a1ac64 Compare May 1, 2026 22:44

lukesandberg mentioned this pull request May 1, 2026

turbo-tasks-backend: fix snapshot coordination races + extract SnapshotCoordinator #93416

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lukesandberg force-pushed the compile_route_mcp_handler branch from 8261a35 to 3f1bb5d Compare May 1, 2026 23:08

lukesandberg force-pushed the eviction_semantics_for_real_this_time branch 2 times, most recently from 07114f2 to c5e00ef Compare May 2, 2026 05:43

lukesandberg force-pushed the compile_route_mcp_handler branch 2 times, most recently from d31c1a1 to e684a7c Compare May 4, 2026 20:08

lukesandberg force-pushed the eviction_semantics_for_real_this_time branch from 327ffb1 to 94bd15c Compare May 4, 2026 22:42

lukesandberg force-pushed the compile_route_mcp_handler branch 2 times, most recently from 1d1d1b7 to 4901a27 Compare May 5, 2026 16:43

lukesandberg and others added 3 commits May 5, 2026 16:38

compile route mcsp handler

0e4f5fe

expand to support url shaped strings not just specifiers

2302393

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d805ca2

lukesandberg force-pushed the compile_route_mcp_handler branch from 4901a27 to d805ca2 Compare May 5, 2026 23:38

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Add MCP `compile_route` tool#93337

Add MCP `compile_route` tool#93337
lukesandberg wants to merge 3 commits intoeviction_semantics_for_real_this_timefrom
compile_route_mcp_handler

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lukesandberg commented Apr 29, 2026 •

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