fix(startup): load the Excel, PDF and DOCX packages on first use (#715)

[mihailt]

Stack #818 · 15/20 · base: fix/config-recovery · next: fix/device-session-restart

Fixes #715, fixes #635. Refs #650.

The reporter's client timed out waiting for initialize, which took 25–90 s on Windows 11. Every start loaded the packages that only Excel, PDF and DOCX files need (exceljs, pdf-lib, md-to-pdf with puppeteer, unpdf, @opendocsg/pdf2md, pizzip) before answering, even when the session never opened such a file: 1,183 of the 1,557 modules loaded before the answer on Windows. Now initialize loads none of them (378 modules before the answer on Windows), and answers in 265 ms instead of 771 ms there (median, warm). After review, they don't load inside the first tool call that needs them either, since that call could take longer than the few seconds a client gives it. Right after initialize, the server loads them in the background, one package at a time; on our machines all are loaded 0.2–0.8 s later. Until a file type's support is loaded, read_file, write_file, edit_block and write_pdf on that type answer at once that it is still loading; a read_file of a URL is checked only when the URL ends in .pdf. Each package is declared next to the code that uses it.

What this fixes

Problem	Fix
initialize took 25–90 s and the client timed out, because every start loaded the Excel, PDF and DOCX packages before answering. #715	initialize loads none of them. Right after it, they load in the background, one package at a time, so each pause of the server is one package. Until a file type's support is loaded, read_file, write_file, edit_block and write_pdf on that type answer at once that it is still loading, instead of loading it inside the call.

Where to look

• src/utils/lazy-package.ts (new) LazyPackage: a package only some files need, declared next to the code that uses it. load() loads it on first use, which code running without the server still does. preload() loads it on a later turn of the event loop, never rejects and shares a load already running; a failure is logged ("Loading failed: ") and kept in error. A package loaded with import() that failed needsRestart: Node keeps a failed import() failed.
• The packages, each next to its code: exceljsPackage in src/utils/files/excel.ts (Excel support, loaded with require()), pizzipPackage in src/utils/files/docx.ts (DOCX support), pdf2mdPackage in src/tools/pdf/lib/pdf2md.ts and unpdfPackage in src/tools/pdf/extract-images.ts (PDF reading support; unpdf is an ES module only and stays import()), mdToPdfPackage in src/tools/pdf/markdown.ts (PDF writing support: md-to-pdf with its Puppeteer, file server and front matter parser; the Chrome warm-up doesn't load it), pdfLibPackage in src/tools/pdf/manipulations.ts (PDF editing support).
• src/utils/files/factory.ts:
  • preloadFileSupport(): the six packages, loaded one at a time, smaller first (pizzip, pdf-lib, @opendocsg/pdf2md, unpdf, exceljs, md-to-pdf), each on its own turn of the event loop.
  • stillLoadingError(): what a file needs for its FileAction (read, write or edit), found by the handlers' own canHandle() (the name only, no disk access). Excel: exceljs; DOCX: pizzip; PDF reading: @opendocsg/pdf2md and unpdf; PDF writing: md-to-pdf; PDF editing: pdf-lib and md-to-pdf. A URL read needs nothing unless the URL ends in .pdf. It gives the still-loading answer, or the couldn't-load one after a failed load, and starts a package that isn't loading, after the call has answered. A failed load isn't kept: the next check starts it again, except unpdf's, whose answer says to restart.
• src/index.ts server.oninitialized: calls preloadFileSupport() next to the Chrome warm-up.
• src/server.ts stillLoading(): the check in handleCallToolRequest, the risky part, one line in each case it applies to: read_file (with isUrl, only a .pdf URL is checked), write_file, edit_block, and write_pdf, read with its own WritePdfArgsSchema (markdown: PDF writing; page edits: PDF editing and writing). The answer names the file, so it is built there, not with createErrorResponse, which would send it to telemetry as server_request_error. read_multiple_files answers per file (readMultipleFiles(paths, stillLoadingError)).
• src/search-manager.ts uses exceljsPackage.load() and pizzipPackage.load(): a content search isn't refused, loads them itself if they aren't loaded yet, and only once it has found Excel or DOCX files. get_file_info isn't checked: it loads on demand and keeps its basic-info fallback.
• The trade-off: each package still pauses the server while it loads, since Node loads modules on the main thread; one at a time keeps each pause to one package (Windows: exceljs 165 ms, md-to-pdf + puppeteer 203 ms, pdf-lib 83 ms; macOS: 58, 80 and 26 ms).
• test/test-startup-imports.js, with test/helpers/server-modules.js and test/fixtures/record-modules-preload.mjs: starts the real server and records every module it loads, before and after the initialize answer. It checks that nothing heavy loads before the answer and that all of it loads soon after without a call. With unpdf held back (test/fixtures/package-load-hooks.mjs; a require() can't be held), a read_file of a PDF answers at once and works once unpdf is loaded, and read_multiple_files says so per file. With a package failing once, as a broken package fails (ES modules in package-load-hooks.mjs, CommonJS in test/fixtures/package-load-preload.mjs, only the server's own copy in node_modules): after a failed exceljs load a later call works, a failed unpdf load says to restart, and write_pdf with markdown that starts with a link is writing. Imports are recorded by test/fixtures/record-modules-hooks.mjs, installed with hookArgs() (test/helpers/module-hooks.js, fix(search): completion, total maxResults, time limits, ripgrep invocation, Office patterns #768's helper: module.register() or, where Node lacks it, --experimental-loader); requires by the preload, through Module._resolveFilename. test/helpers/heavy-packages.js callToolOnceLoaded() retries while the answer says "still loading", for the server tests that open a PDF or DOCX file right after connecting.
• test/test-still-loading-answers.js (new): the server in the test's own process, with its telemetry caught. A read_file of a URL ending in .docx is fetched while DOCX support is still loading; the answer for salary-2026.xlsx names the file, and no telemetry event does.
• test/test-search-office-completion.js (fix(search): completion, total maxResults, time limits, ripgrep invocation, Office patterns #768's test): its "exceljs can't be loaded" case now makes require('exceljs') fail with a preload (Module._resolveFilename), since the search loads exceljs with require().

How to verify

git checkout f28ac02 && npx shx rm -rf dist && node test/run-all-tests.js test-startup-imports.js   # fails before: 2 of 3 cases, all 7 packages loaded
node test/repro/run-repro.js test-startup-heavy-imports.js   # REPRODUCED before
git checkout 10b3c93 && npx shx rm -rf dist && node test/run-all-tests.js test-startup-imports.js   # fails before the background load: nothing loads without a call, and a call waits for a held package
git checkout aeaae5e && npx shx rm -rf dist && node test/run-all-tests.js test-startup-imports.js test-still-loading-answers.js   # fails before 6da0361: a .docx URL refused, the file name in telemetry, no working call after a failed exceljs load, no restart answer for unpdf
git checkout fix/lazy-heavy-imports && npx shx rm -rf dist && node test/run-all-tests.js test-startup-imports.js test-still-loading-answers.js   # passes after
node test/repro/run-repro.js test-startup-heavy-imports.js   # NOT REPRODUCED after; prints initialize's time for each start
npm test   # the whole suite

Answers that change

Before	After
read_file, write_file, edit_block or write_pdf on an Excel, DOCX or PDF file right after initialize: worked (the packages had loaded before initialize)	in the first moments after initialize, until that support is loaded: "Error: Can't read report.xlsx yet: Desktop Commander is still loading its Excel support (it starts right after launch). Try again in a few seconds." (write or edit; DOCX, PDF reading, PDF writing or PDF editing support; in read_multiple_files, for that file). A read_file of a URL (isUrl) is fetched as before, unless the URL ends in .pdf (PDF reading support). Afterwards as before
With an Excel, PDF or DOCX package missing or broken, the server didn't start	It starts. The tools that need that package answer "Error: Can't read report.xlsx: Desktop Commander couldn't load its Excel support (). It's loading it again; try again in a few seconds." (read_file, write_file, edit_block, write_pdf; in read_multiple_files, for that file), and a later call loads it again. For unpdf: "Error: Can't read report.pdf: Desktop Commander couldn't load its PDF reading support (). Restart Desktop Commander to load it again." get_file_info gives only the basic file info; a content search leaves out that file type's results and says so: "⚠️ Completed, but some files couldn't be searched: the Excel search failed ()." (or "the DOCX search failed"; #768's wording).

With the packages installed, every tool answer and description is unchanged once they are loaded.

Commits and test results

Commit	What it does
f28ac02	Test: the startup-imports test and the repro.
38fa916	Each package loads where it is used, on first use.
ff1d5e4	The module-recording helper closes its client through closeClient().
5db439e	The module recorder works on Node before 22.15 too. Before, the test and repro failed at connect there.
59eb097	The module recorder installs its hooks with hookArgs(), so it also works on Node without module.register() (18.18, 19 and 20.0–20.5; the startup test was checked on 18.18.2 and 20.5.1).
10b3c93	Tests: nothing heavy before initialize; all of it loaded soon after, without a call; a call during loading answers at once, naming the file and the action; read_multiple_files says so per file; write_pdf markdown that starts with a link is writing; a failed load isn't kept.
938f1df	The Excel, DOCX and PDF packages load in the background right after initialize, one at a time; until a file type's support is loaded, read_file, write_file, edit_block and write_pdf answer at once that they can't read, write or edit that file yet.
aeaae5e	Tests: the still-loading answer names the file, but no telemetry event does; a read_file of a .docx URL isn't refused; after a failed exceljs load, a later call works; a failed unpdf load says to restart.
6da0361	Each module declares its package as a LazyPackage next to its code, and the still-loading check moves to utils/files/factory.ts; the answer no longer goes to telemetry, exceljs loads with require(), a failed unpdf load says to restart, and a URL read is checked only for a .pdf URL.

• Full suites at the top of the stack, on main (c774c3b): Windows 11 / Node 24.18: unit 168/168, integration 4/4, repros 19/19. macOS 26.6.2 / Node 24.15: unit 168/168, integration 4/4, repros 19/19. Checks skipped for the platform, missing rights or a missing tool: 7 on Windows, 10 on macOS.
• On Windows 11 / Node 24.18 and macOS 26.6.2 / Node 24.15, with a clean dist/: the test fails and the repro reproduces 5 of 5 at f28ac02; both pass at 38fa916.
• On Windows 11 with a clean dist/: at ff1d5e4, the test fails at connect on Node 20.20.2 and 22.14.0, because the preload needs registerHooks (Node 22.15+). At 5db439e, it passes on 18.20.8, 20.20.2, 22.14.0, 22.15.0 and 24.18.0 (374 modules before initialize on each), and the repro gives NOT REPRODUCED 5 of 5 on 20.20.2, 22.14.0 and 24.18.0. The same preload on the product before the fix (f28ac02's src/) gives identical results on 20.20.2 and 24.18.0: the test fails and the repro reproduces, with 1,557 modules, 1,183 of them through the 7 packages. On macOS 26.6.2 with a clean dist/, at 5db439e: the test passes and the repro gives NOT REPRODUCED 5 of 5 on Node 22.14.0 and 24.15.0 (374 modules before initialize on each).
• On Windows 11 with a clean dist/: at 5db439e, the test fails at connect on Node 18.18.2, 19.9.0, 20.0.0 and 20.5.1 ("Module.register is not a function"). At 59eb097 (on fix(search): completion, total maxResults, time limits, ripgrep invocation, Office patterns #768's hookArgs() commit), it passes on 18.18.2, 20.5.1, 20.6.0, 22.15.0 and 24.18.0 (375 modules before initialize: the hooks also record the preload itself; 374 on 20.6.0), and the repro gives NOT REPRODUCED 5 of 5 on 20.5.1 and 24.18.0. On the product before the fix (f28ac02's src/), Node 24.18.0 (module.register()) and 20.5.1 (--experimental-loader) both catch all 7 packages: the test fails, and the repro reproduces with 1,183 of 1,558 modules and the same per-package counts.
• 10b3c93, 938f1df, on Windows 11 / Node 24.18 and macOS 26.6.2 / Node 24.15 at the same time, with a clean dist/: on the code before the background load, the test's first version fails 3 of its 5 cases on both (nothing loads after initialize without a call; with exceljs held, a call gives no answer within 5 s; a failed load answers its raw error); the read_multiple_files and write_pdf cases were added later and checked only against a first version of the fix, whose answers didn't name the file or the action: there they fail on both, with the read_file and failed-load cases. At 938f1df the test passes: a call while loading answers in 22 ms on Windows and 12 ms on macOS. On the first version of the fix (the same load code), the last package was loaded 0.2–0.8 s after the answer. The startup test, every test-pdf-*.js, the two test-excel-*.js, test-file-handlers.js, the two test-search-office-*.js, test-docx-header-footer-edit.js and test-client-results.js pass (24/24; on macOS test-pdf-system-chrome.js skips, Windows only), and so do the repros test-startup-heavy-imports.js and test-pdf-launch-failure-server.js.
• aeaae5e, 6da0361, on Windows 11: at aeaae5e, on the code of 938f1df, test-still-loading-answers.js fails both its cases (a read_file of a URL ending in .docx answered "Can't read report.docx yet: Desktop Commander is still loading its DOCX support …"; telemetry got the file name in a server_request_error event), and test-startup-imports.js fails 2 of its 9: after a failed exceljs load, the next call failed again with "… It's loading it again; try again in a few seconds.", and a failed unpdf load answered the same instead of saying to restart. Its other cases pass; with unpdf held, a call answers in 22 ms, then works. At 6da0361 the build passes; the startup test, test-still-loading-answers.js, every test-pdf-*.js, the two test-excel-*.js, test-file-handlers.js, test-read-multiple-files.js, the two test-search-office-*.js, test-docx-header-footer-edit.js and test-client-results.js pass (26/26), and so do the repros test-startup-heavy-imports.js (NOT REPRODUCED, initialize median 410 ms over 5 starts) and test-pdf-launch-failure-server.js. With Node 24.18, the startup test at 6da0361 counts 378 modules before initialize, and the last package loads 302 ms after it.
• initialize median, warm: 771 → 265 ms on Windows, 291 → 180 ms on macOS. The first Windows start after a clean build, before the fix: 8,160 ms. The background load doesn't slow it: with the code before the background load and its first version (the same load code as 938f1df) alternated in one session, the medians showed no consistent difference; at 938f1df, 456 ms on Windows and 182 ms on macOS (5 starts each).
• Known and not changed:
  • Slow/inconsistent initialize response causes Cowork/Code shared-pool timeout #645: 40–70 s under Claude Desktop's bundled Node (about 1 s with the system Node) has a cause outside Desktop Commander.
  • The reporter's 25–90 s was not reached on these machines, before or after the fix.
  • unpdf is an ES module only and loads with import(). If it fails to load, Node keeps it failed, so PDF reading works again only after a restart, as the answer says. The other packages load with require(), and a later call loads them again.
  • PDF editing also waits for PDF writing (inserted markdown is rendered), so a delete-only edit may say "still loading" a moment longer.
  • With an Office package missing, a content search leaves out those files; its answer says that part failed (fix(search): completion, total maxResults, time limits, ripgrep invocation, Office patterns #768).
  • The other modules loaded before initialize (MCP SDK, zod, …) were not examined.
  • Node 18.0–18.17 has no --import, so the test and the repro can't start their server there (Node 18 is out of support). package.json still declares >=18.0.0.

Stack #818: #781 makes the tests run on Windows and macOS; #770–#768 fix what that exposed; #773–#779 fix the issues listed in each; #780 fixes the remote device's state; #794 reports targeted Broadcast receipts.

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Summary by CodeRabbit

• Performance
  • The app becomes ready sooner by loading Excel, Word, and PDF support after startup.
• File Support
  • File operations remain available while format support loads; affected files receive a clear status message until support is ready.
  • Errors during loading are reported with guidance when an operation cannot proceed.
• Reliability
  • File support can recover from some loading failures on a later attempt.

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• src/handlers/filesystem-handlers.ts
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• src/server.ts
• src/tools/filesystem.ts
• src/tools/pdf/extract-images.ts
• src/tools/pdf/index.ts
• src/tools/pdf/lib/pdf2md.ts
• src/tools/pdf/manipulations.ts
• src/tools/pdf/markdown.ts
• src/utils/files/docx.ts
• src/utils/files/excel.ts
• src/utils/files/factory.ts
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📝 Walkthrough

Walkthrough

Excel, DOCX, and PDF dependencies now load on demand or in the background after initialization. File operations check whether required packages are ready and return loading or failure messages when needed. New tests record package loads and check startup and file-operation behavior.

Changes

Deferred file dependency loading

Layer / File(s)	Summary
Load file dependencies on demand src/utils/lazy-package.ts, src/utils/files/*.ts, src/tools/pdf/*, src/search-manager.ts	A shared lazy loader backs ExcelJS, PizZip, and PDF package loading. File operations obtain packages through the loader. Excel and DOCX search return before loading their package when no files match.
Background loading and readiness responses src/utils/files/factory.ts, src/utils/files/index.ts, src/index.ts, src/server.ts, src/handlers/filesystem-handlers.ts, src/tools/filesystem.ts	The server starts sequential package preloading after initialization. File operations check package readiness, and multi-file reads can return per-file loading errors.
Record and verify package loading test/fixtures/*, test/helpers/*, test/repro/test-startup-heavy-imports.js, test/test-startup-imports.js, test/test-still-loading-answers.js, test/test-search-office-completion.js, test/integration/edit-block-performance.js, test/repro/test-pdf-launch-failure-server.js, test/test-client-results.js, test/test-docx-header-footer-edit.js	Test fixtures record module loads and simulate held or failed package loads. Tests and repro scripts check startup loading, readiness responses, retries, and file operations. Existing tool-call tests retry while support is loading.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant MCPClient
  participant Server
  participant FileSupport
  participant FileTool
  MCPClient->>Server: initialize
  Server->>FileSupport: start sequential package preload
  Server-->>MCPClient: initialize response
  FileTool->>Server: file operation
  Server->>FileSupport: check required packages
  FileSupport-->>Server: readiness or loading error
  Server-->>FileTool: dispatch operation or return error

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Suggested reviewers: ds-dcmpc, wonderwhy-er

Merge Risk: 🟡 Moderate · up to 6da03

Startup tests and the startup reproduction cannot run on some supported Node 18 versions. Add a compatible preload path or narrow the supported-version contract before merging.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 6da03

The inspected write paths stop before file mutation or PDF rendering when support is unavailable, and the rendering safeguards examined remain intact. No introduced security attack path was established. Some operations still load dependencies directly, leaving limited uncertainty about readiness consistency and temporary server responsiveness.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — A caller with file-tool access can select operations that initiate deferred loading. Loading pauses and shared readiness state affect the serving process, but the inspected inputs select fixed package handles rather than arbitrary module names. No new cross-tenant or cross-service authority was established.

Security Findings and Attack Paths

• observed — A URL without a .pdf suffix can bypass the readiness response when its response MIME type identifies a PDF, reaching direct PDF loading inside the operation. The same URL-to-PDF dispatch existed at the merge base; this is a loading-timing exception, not an established new network or parser attack path.

Trust Boundaries and Controls

• observed — Readiness is an availability gate, not an authorization decision. When it blocks an inspected write operation, the handler is not invoked; when it passes, execution continues through the existing handler. write_pdf retains schema validation before this gate.

Resilience and Maintainability Implications

• inferred — Recording package failures and continuing preload improves failure containment relative to eager startup imports. This does not guarantee responsive calls throughout loading: synchronous loaders still occupy the main thread, and direct consumers do not share preload-state ownership.

Hardening Proposals

• proposed — Consider consolidating direct loading and preload under one package-owned readiness mechanism, and checking readiness again when a URL response is classified as PDF. This would reduce state drift and preserve the intended failure-containment behavior without treating readiness as authorization.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR meets the lazy-loading objective in [#715]. It defers the Excel, DOCX, and PDF packages until after initialize, preloads them sequentially, handles calls made while support loads, and adds te…	Add stage-level initialize timing logs and automated tests that verify the timing output.
Docstring Coverage	⚠️ Warning	Docstring coverage is 62.07% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 58 functions across 30 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Out of Scope Changes check	✅ Passed	The package-loader changes, readiness checks, search behavior, and test-helper updates support the linked startup and deferred-loading objectives [#715, #635]. The test and reproduction changes verify…
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the startup change and the affected Excel, PDF, and DOCX packages. “On first use” is an oversimplification because the packages also preload in the background after initia…

Full details: Linked Issues check

Explanation

The PR meets the lazy-loading objective in [#715]. It defers the Excel, DOCX, and PDF packages until after initialize, preloads them sequentially, handles calls made while support loads, and adds tests for startup, file operations, and load failures. The reported tests also cover file-handler behavior. For [#635], the PR reports faster initialization on tested systems, but it adds no stage-level initialize timing logs, which the issue requests. The available change summary and PR description show no such instrumentation.

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[ds-dcmpc]

we should not load during tool call, our tool call time is limited to 3 sec. if the lib require loading for 30+ secs, its a failed tool call.
we need to move this load to mcp startup, but might be on background async, so the whole server could start faster and load these dependencies in background

[ds-dcmpc]

tool call has limited time to 3 sec to execute, we can wait for 90 seconds

[ds-dcmpc]

Desktop Commander's initialize handshake takes 24 to 26 s on a cold start.

the main problem is in initialize is taking more than 30 seconds, not the load itself. if initilize will take under 5 seconds, everyone will be happy

[mihailt]

@coderabbitai resume

[coderabbitai]

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