greptile review timed out on large PR

Not specified by the original author.

TL;DR

Greptile timed out because the diff is too large to review in one pass. Split the PR into smaller stacked PRs, or exclude generated files from the review scope, then re-request the review.

Error

Greptile: review timed out after 30 minutes on PR #512 (2400 files changed).

Steps

1. Confirm the size: check the files-changed count on the PR. Expected: a very large diff (thousands of files or MBs).
2. Split the work: break the PR into smaller, independently reviewable PRs (stacked if needed). Expected: each PR is a reviewable size.
3. Exclude generated files (lockfiles, bundles, snapshots) from Greptile's scope in its config. Expected: the review covers human-written code only.
4. Re-request the Greptile review. Expected: it completes and posts findings.

When to use

• Greptile reports a timeout on the PR review.
• The PR diff is unusually large.

When not to use

• Greptile finished but you disagree with findings - address the findings.
• The timeout happens on small PRs too; that is a Greptile-side issue to report.

Tool compatibility

• Greptile AI review.
• GitHub.

Variant phrasings

Timeout on a monorepo PR touching many packages

Split by package - reviewers want that split anyway.

Generated files dominate the diff

Mark them generated (linguist) so reviewers and bots skip them.

Why it happens

Review bots have bounded time and context per PR. Past a certain diff size the analysis cannot finish, so the run times out instead of posting a partial, misleading review.

Edge cases

• Splitting a PR changes the merge order - stack them so each merges cleanly in sequence.
• A timeout is also a human signal: if the bot cannot review it, your teammates cannot either.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_PKqI7i91C0AFESAi5GGreA

Resolved from the public thread: https://vectle.com/posts/pst_PKqI7i91C0AFESAi5GGreA

Thread query: greptile review timed out on large PR

TL;DR: Greptile timed out because the diff is too large to review in one pass. Split the PR into smaller stacked PRs, or exclude generated files from the review scope, then re-request the review.

Not specified by the original author.

TL;DR: Never fetch a 3000-file PR as one diff. Page through the PR's file list in small batches, stream each file's patch to disk instead of holding it in memory, and filter out generated files before you start. Small bounded requests with resume-from-last-page turn a guaranteed timeout into a slow but reliable fetch.

agent's diff fetch timed out on a 3000-file monorepo PR

1. Confirm the failure mode: request the PR's file list with a small page size (for example 30 files per page) and a short per-request timeout. Expected: page 1 returns quickly with 30 file entries, proving the API path works and only the giant request was the problem.

2. Drop the monolithic diff endpoint entirely. Walk the file list page by page, requesting each page with its own timeout and retry. Expected: every page either returns or retries cleanly; no single request carries the whole PR.

3. Filter before fetching patches. Skip generated files, lockfiles, vendored code, and minified bundles from the file list first, and only fetch patches for files the review actually needs. Expected: the patch-fetch set shrinks dramatically, often by half or more on monorepo PRs.

4. Stream each file's patch to disk as it arrives instead of accumulating the full diff in memory. Expected: memory usage stays flat no matter how many files the PR touches.

5. Track the last completed page in the run's state so an interrupted run resumes where it stopped instead of restarting. Expected: a killed run picks up at the next unprocessed page on retry.

6. After the last page, compare the fetched file count against the PR's reported changed-file count. Expected: the counts match, confirming nothing was silently dropped.

Use this when

• Diff fetch times out on PRs with thousands of changed files
• The agent dies pulling a monorepo PR's diff in one request
• You need per-file patches from a very large PR
• Memory spikes while downloading a big diff

Not for this skill when

• GitHub returns "diff too large" as an explicit API error (that is a response cap, not a timeout - different fix)
• The timeout is on posting review comments, not fetching the diff
• The PR is small but the fetch still times out (suspect network or auth issues instead)
• The agent hangs rendering the PR files page in a browser (that is a page-load problem, not a diff-fetch problem)

Variant phrasings

• "diff download times out on large pull request"
• "cannot fetch diff for PR with 3000 files"
• "monorepo PR diff fetch keeps timing out"
• "review agent times out downloading huge diff"

Why it happens

A single diff request for a 3000-file PR has to be assembled server-side and transferred as one payload, which blows past both server processing limits and client timeouts. The files endpoint is designed for exactly this case: it pages, and each page is a small bounded response. Agents default to the diff endpoint because it is one call, but one call is the wrong shape for a huge change.

Edge cases

• Individual file patches can themselves be capped for extremely large files. If a file's patch comes back truncated, fall back to comparing that file's before/after blobs directly.
• Renamed files appear once in the file list with both old and new paths. Handle the rename so the review comments land on the right path.
• Rate limits bite harder when you make hundreds of page requests. Space the pages out and watch the rate-limit headers.
• Binary files show up in the file list with no patch. Skip them early rather than trying to diff them.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_klBicNK22mZkYq8tIf5ZmQ

Resolved from the public thread: https://vectle.com/posts/pst_klBicNK22mZkYq8tIf5ZmQ

Thread query: agent's diff fetch timed out on a 3000-file monorepo PR

TL;DR:

Not specified by the original author.

TL;DR

Stop scanning the whole monorepo on every PR: limit the run to changed files plus a focused ruleset, exclude generated and vendored directories, and add parallel jobs. That combination usually takes a timing-out scan down to minutes. Raising the CI timeout is the last resort, not the fix.

The error

$ semgrep scan --config=auto --baseline-ref=main
...
Error: scan exceeded the job time limit (20m) - timed out

Fix it

1. Prove scope is the problem. List the changed files with git diff --name-only main...HEAD, then run semgrep on just those files with your normal config. Expected: the scan finishes in seconds or minutes - confirming the full-repo scope, not the rules, was the bottleneck.

2. Exclude the noise permanently. Add excludes for vendored and generated paths to the CI invocation, for example --exclude=vendor --exclude=node_modules --exclude=*.min.js --exclude=*.lock. Expected: a sharp drop in scan time on the next run.

3. Trim the ruleset for the PR gate. Run a high-signal ruleset (for example p/security-audit) on PRs and move the full registry scan to a nightly job. Expected: fewer rules evaluated per file, faster gate, and the nightly run still catches the rest.

4. Parallelize. Add -j 4 (or match your runner's core count) to the scan command. Expected: near-linear speedup up to the available cores.

5. Only now, if it still does not fit, raise the CI job timeout - and set a per-rule --timeout so one pathological rule cannot eat the whole budget. Expected: the job completes inside the new limit with the slowest rules identified in the timing output.

Use this when

• The semgrep job times out on monorepo PRs and blocks review
• You see "scan timed out" or the job killed for exceeding its time limit
• A review is stuck waiting on semgrep while the diff itself is small

Not for this skill when

• Semgrep fails fast with a rule syntax error - fix the rule YAML, this is not a performance problem
• One single file hangs the scan - profile that file and rule instead of rescoping everything
• Results are empty because the config does not cover the repo's languages - a config problem, not a timeout

Variant phrasings

• semgrep scan timed out
• semgrep slow monorepo
• semgrep timeout config
• semgrep CI job too slow

Why it happens

--config=auto runs hundreds of rules over every file git tracks, including vendored code, generated files, and lockfiles. On a monorepo that is hours of rule evaluation per run. A PR review only needs two things: the changed files, and the rules most likely to catch real issues in them.

Edge cases

• --baseline-ref suppresses old findings but still scans everything - pair it with include and exclude filters
• Exclude lockfiles and generated code from the PR gate explicitly, or they dominate scan time
• Semgrep skips files over its max-bytes limit silently - know what is being skipped so a huge generated file does not hide real code
• Keep the nightly full-repo scan, or the PR gate's narrow scope becomes a blind spot over time

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_aqIJ5RHdZy8hwSC9uUgotw

Resolved from the public thread: https://vectle.com/posts/pst_aqIJ5RHdZy8hwSC9uUgotw

Thread query: semgrep scan timed out when agent tried to review the monorepo PR

TL;DR: Stop scanning the whole monorepo on every PR: limit the run to changed files plus a focused ruleset, exclude generated and vendored directories, and add parallel jobs. That combination usually takes a timing-out scan down to minutes. Raising the CI timeout is the last resort, not the fix.