fix(slack): paginate the member channel lookup; structure member-rule denials - #151
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… denials Two further CodeRabbit findings, both verified against the code first. lookupChannelByName read only page one of users.conversations and ignored its cursor. That is not a performance detail: users.conversations is the *only* source that returns im and mpim conversations — the workspace fallback queries public_channel,private_channel and cannot see them at all — so a DM or group DM past the first 200 member conversations was simply unfindable by name. It now follows the cursor under the same page bound as the workspace scan, and reports a bounded member scan rather than falling through and reporting the channel as absent, which would read as "no such channel" when it means "I stopped looking". assertDmMemberAccess still threw a bare UserError, so diagnoseChannelAccess hit its non-denial branch and printed the raw sentence instead of routing through explainDenial — the one tool whose entire purpose is naming the rule and its remedy was the one place these three rules got no remedy. They now throw SlackAccessDenied with dm-org-not-allowed / group-dm-blacklist / group-dm-org and carry the offending team ID, so the explanation names the organisation and points at the right dashboard control. Message text is unchanged, so existing assertions and any caller that only prints them are unaffected. Org-name resolution keys off orgIds being present rather than the single org-not-allowed reason, so the two new org cases get named orgs too. The remaining bare-UserError branch in the tool is now genuinely for non-denial errors only (a missing rules record, say) and says "Could not evaluate" rather than dressing the failure up as a rule verdict. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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WalkthroughSlack channel lookup now scans paginated member conversations, including DMs and group DMs, before workspace fallback. Slack access checks now return structured denial reasons, organization IDs, tailored explanations, and clearer evaluation errors. ChangesSlack access and channel discovery
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to Channel discovery now paginates member conversations, but accounts exceeding the member scan limit can incorrectly fail to discover otherwise searchable public or private workspace channels. This should be corrected before merge. Sequence Diagram(s)sequenceDiagram
participant lookupChannelByName
participant SlackUsersConversations
participant WorkspaceScan
lookupChannelByName->>SlackUsersConversations: Request paginated member channels
SlackUsersConversations-->>lookupChannelByName: Return DM/group-DM pages
lookupChannelByName->>WorkspaceScan: Search workspace channels when member scan finds no match
WorkspaceScan-->>lookupChannelByName: Return workspace pages or bounded scan status
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Inline comments:
In `@src/slack-user/server.ts`:
- Line 993: Update the channel lookup flow around the bounded member scan and
conversationsListAll so an empty bounded member result still proceeds to the
workspace scan. Preserve the member-scan bound as uncertainty only when neither
scan finds the channel, and extend ChannelLookup to identify which scan produced
that result so callers report the correct limit. Add a regression test covering
11 member pages with a matching workspace channel.
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src/__tests__/slack-user/listChannelRows.test.tssrc/slack-user/accessControl.tssrc/slack-user/server.ts
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Regression introduced by the pagination fix in this PR. Returning early when the member scan hit its page bound skipped conversationsListAll entirely, so an account with more than DIAGNOSE_MAX_PAGES of member conversations could no longer discover a public or private channel it is not a member of — the exact case the workspace fallback exists for. The bound is now remembered rather than returned: the workspace scan always runs, and only if neither scan finds the channel does the uncertainty surface. ChannelLookup's scanBounded variant carries a `source`, because the caller was reporting a member-scan limit as "the first N pages of the workspace channel list" — naming the wrong list, which sends the user looking in the wrong place. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Follow-up to #150. CodeRabbit posted two further findings after that PR was merged, so they land separately. Both were verified against the code before fixing.
lookupChannelByNameignored the member-list cursordiagnoseChannelAccessresolved a channel name in two passes:users.conversations(member-scoped, cheap) and then a bounded workspace scan. The first pass read only page one and droppedresponse_metadata.next_cursoron the floor.That is not a performance detail.
users.conversationsis the only source that returnsimandmpimconversations — the workspace fallback queriespublic_channel,private_channeland cannot see them at all. So a DM or group DM past the first 200 member conversations was simply unfindable by name, in the one tool whose job is explaining why something is unfindable.It now follows the cursor under the same
DIAGNOSE_MAX_PAGESbound as the workspace scan, and returnsscanBoundedrather than falling through tonone— reporting "no such channel" when the truth is "I stopped looking" is the failure mode this tool exists to eliminate.Member-rule denials were unstructured
assertDmMemberAccessstill threw a bareUserErrorfor its three rules, sodiagnoseChannelAccesshit its non-denial branch and printed the raw sentence instead of routing throughexplainDenial. The tool whose entire purpose is naming the rule and its remedy was the one place these three rules got no remedy.They now throw
SlackAccessDeniedwithdm-org-not-allowed/group-dm-blacklist/group-dm-org, carrying the offending team ID, so the explanation names the organisation and points at the right dashboard control:Message text is unchanged, so existing assertions and any caller that only prints them are unaffected. Org-name resolution now keys off
orgIdsbeing present rather than the singleorg-not-allowedreason, so the two new org cases get named orgs too. The remaining bare-UserErrorbranch is genuinely for non-denial errors (a missing rules record, say) and says "Could not evaluate" rather than dressing a failure up as a rule verdict.Verification
npm run typecheckclean;npm run lintat baseline (0 errors, 53 pre-existing warnings).main.imandmpimlookups, the bounded-member-scan report, early exit on match, the workspace fallback still working, and one per member-rule denial including the raw-ID fallback when Slack will not name the org.auth/exchangeAuthCode,auth/oauthProxy, and the uncommittedcalendarEventSchemas.test.ts).pasteTokenReauth.route.test.tstimed out once under parallel CPU contention and passes 7/7 standalone and on a re-run.Still unverified against a live Slack workspace, as with #150.
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