Returns merged pull request counts per person (or per repository with groupBy=repository) for your team, for GitHub or GitLab. Choose the shape of the result with granularity and groupBy. prsMergedWithCodingTool counts merges whose commits matched your team's configured co-author patterns (Claude Code's by default), so it answers 'AI-assisted' without naming a vendor. The prsMergedByVendor and totalPrsMergedByVendor maps name the vendor for every merge that matched a recognized vendor's patterns. The two are not nested: if you configure a signature that no built-in vendor pattern covers, the merge is counted in prsMergedWithCodingTool with no vendor identified. Because one PR can be attributed to several vendors, vendor counts may sum to more than prsMerged. Vendor keys are coding assistant names such as ClaudeCode (not claude-code), and a key is present only with a non-zero count. The vendor maps are omitted when no vendor was attributed, and on week or month buckets they are not filled in with zeros. historyStartDate is the earliest day with PR activity recorded for this team and source, regardless of the requested dates, and is returned for every granularity. It is a lower bound on coverage, not a promise that earlier days had no activity, and it is null when no activity has been recorded for the source. With groupBy=repository, returns one row per repository for the window, with an optional per-person breakdown (includeMembers) and an optional list of the individual merged pull requests (includePullRequests, paged by prLimit and prOffset). The window may span at most 366 days counting both startDate and endDate, and at most 35 days with includePullRequests; a wider window answers 400. Repositories are matched on the last two parts of the repository name, ignoring letter case, so two spellings that differ only in case are one row; repositoryDisplay carries the longest spelling seen in the window. Grouped rows add up to the ungrouped total when the window falls inside the last 30 days and the repository filter did not change during it; for older days, each day keeps the filter that applied when it was recorded. source=gitlab with groupBy=repository returns 200 with an empty list and a reason in syncScope, because GitLab does not provide per-repository merge requests. Every response carries syncScope, saying whether a credential exists for the source, whether a repository filter is active and how many repositories it covers, so a team with no integration is distinguishable from one with a quiet month. Its totalRepositoryCount is not populated yet and is always null. teamId names the team to read, as on every PR Health endpoint; without it, the API key's team is used, else the signed-in user's first team.