[brycebaril]

The ns-analyze-tracing skill said tracing-detail isn't exposed over MCP, and told agents to look a trace up with tracing's span_traceId filter. Both are wrong for current consoles. tracing-detail is an MCP tool that returns every span of a trace, with pagination metadata. tracing ignores span_traceId and returns the default page (nodesource/nsolid-console-ng#5518). Agents following the skill matched span_parentId values by hand, or reported that they couldn't pull full traces.

Changes, all in skills/ns-analyze-tracing/SKILL.md:

• A trace ID alone goes to tracing-detail { span_traceId }, paged with page/showLimit while more remain. Never tracing with span_traceId.
• Step 6 builds the parent/child waterfall from tracing-detail (span_id, span_parentId). It falls back to list-level evidence, and says so, only when the tool isn't available (older consoles).
• Steps 7–8 and the guardrails allow parent/child claims when the hierarchy came from tracing-detail, not only from a supplied tree. A new guardrail says not to pass span_traceId to tracing.
• Step 3: tracing rounds start down to the hour (nodesource/nsolid-console-ng#5519). Agents check metadata.start, and for a sub-hour window pass an explicit ISO start and filter rows by span_start.

Testing: pnpm lint and pnpm typecheck pass. The commit skipped the pre-commit hook, with the maintainer's OK. Its test suite can't run on the Windows machine this was made on: tests from fcaa1fc create file symlinks, which Windows refuses without Developer Mode, so they fail with EPERM on main too. This PR changes only Markdown; CI runs the full suite.

Fixes #72

🤖 Generated with Claude Code

[ns-control-tower]

Walkthrough

Re-review of the synchronized head 6b782e55 (previous reviewed head 1f2c83c, approved). Still a Markdown-only change to skills/ns-analyze-tracing/SKILL.md (+14/-8, one file). This commit folds in @Cesar-M-Diaz's one open note from his approval on 1f2c83c:

• Step 1 now reads a trace with one tracing-detail call at showLimit: 150 — dropping both showLimit: 1000 and the follow-up fetch up to totalSpans. Spans come back whole, so a larger page can overflow the MCP client's output limit, and the big traces are exactly the N+1 cases this skill targets.
• Step 1 / Step 6 / Guardrails now agree on the partial case: when the trace exceeds the page, don't fetch more — report the waterfall as covering returnedSpans of totalSpans, unordered. That still shows repeated span names (an N+1), never the critical path or totals.

Assessment

Verified the new claims against nsolid-console-ng master (74adf6a):

• ✔ returnedSpans / totalSpans exist in the tracing-detail metadata (lib/http-api/v4/GET-tracing-detail.js:64-78; includeMetadata is forced true over MCP in lib/mcp-server.js:753-755), so the reporting wording is grounded.
• ✔ tracing-detail responses are unsummarized — no entry in SUMMARIZE_CONFIG (lib/mcp-server.js:17-35) — so the output-limit rationale holds; showLimit: 150 is accepted (normalizePositiveInteger via normalizePagination, lib/util.js:51-63, no cap).
• ✔ @Cesar-M-Diaz's showLimit: 1000 note (discussion r4316330863) — implemented as suggested and verified in the head file.
• ✔ All eight earlier inline notes remain fixed in the head text (Step 3 whole-hour window language, Step 1 fallbacks, page paging removal, Step 6 sort/gating, description wording, guardrails).
• ✔ CI: the test workflow run for this head (run 39299144214) completed successfully — all three heads of this PR pass it.

The two other non-blocking notes from the human review on 1f2c83c (Step 10 pre/post-deploy comparison; Step 3 "current hour" phrasing) remain open by choice — neither blocks.

No new correctness, security, or performance findings — the change is Markdown-only and the console behavior it cites matches the code.

Verdict: APPROVE — the synchronized head resolves the last open note, matches the console code, and introduces no new issues.

[Cesar-M-Diaz]

Reviewed against nsolid-console-ng master (a4af2501a).

Confirmed correct in this PR:

• tracing does ignore span_traceId: it is listed in the schema (schemas/http-v4.toml, [GET.tracing]) but GETTracing in lib/db/elastic/reader.js never adds it as a filter. The new guardrail is right.
• tracing-detail is MCP-exposed (since 7ddf52ee19, first in v6.5.2) and MCP forces includeMetadata=true (lib/mcp-server.js), so hasMore is always present.
• metadata.start reflects the rounded start (GET-tracing.js), so checking it is useful.

Main concern: the sub-hour window guidance in Step 3 can't work as written (see inline comments). Two related points that fall outside the diff hunks:

1. Step 5 (lines 33–36) trusts metadata.total / empty results. metadata.total is the cardinality of span_traceId over the hour-rounded window (trace_id_count agg in reader.js). For a 10:40–11:00 window, an app whose only matching traces are at 10:10 still gets metadata.total > 0, so Step 5 would report it "has matching traces". Step 3 and Step 5 should agree on what window the evidence actually covers.
2. Default window when no start is passed is ~23–24h, not "recent": GET-tracing.js uses now - 23h, rounded down to the hour. Worth stating next to the rounding note so the agent doesn't present a day of data as current.

Suggested rewrite for the Step 3 bullet: drop "pass an explicit ISO start and keep only rows…"; instead say the effective minimum granularity is the full hour, that the summary aggregates and metadata.total cover that whole hour, and that the report must state the actual window from metadata.start/metadata.end.

[Cesar-M-Diaz]

An explicit ISO start is also rounded down to the hour. GET-tracing.js does qData.start = dayjs(qData.start).minute(0).second(0) regardless of input format, and reader.js repeats the same rounding in both GETTracing (legacy) and _GETTracingOTel. Passing start=2026-10-14T10:40:00 still returns everything from 10:00, while the agent believes the ISO value fixed the window.

[brycebaril]

Right, confirmed in GET-tracing.js and both reader paths. Fixed in 1f2c83c. Step 3 now says tracing works in whole hours: it rounds start down even for an exact ISO time, and the report states the window from metadata.start and metadata.end. The "pass an explicit ISO start" advice is gone.

[Cesar-M-Diaz]

There are no rows to filter by span_start. SUMMARIZE_CONFIG.tracing in lib/mcp-server.js has no optIn, so every MCP tracing response is always summarized into per-app aggregates (min/max/median/latest, uniqueValues). Only the min/max/latest context snapshots carry span_start (formatRecordContext in summarize-data.js); the median, counts, uniqueValues of span_traceId and metadata.total all include the out-of-window traces and can't be trimmed. The agent can't do "keep only rows whose span_start falls inside the window" and may report earlier latency as current.

[brycebaril]

Confirmed: tracing has no optIn in SUMMARIZE_CONFIG, so shouldSummarize is always true for it. Fixed in 1f2c83c with your suggested rewrite. Step 3 says the MCP response is always summarized per app, so it can't be narrowed to a shorter window afterwards, and that metadata.total counts the whole rounded window. The "keep only rows whose span_start" instruction is gone.

[Cesar-M-Diaz]

No fallback for consoles < v6.5.2 on the trace-ID-only path. tracing-detail was first MCP-exposed in v6.5.2. On older consoles this step requires a tool that doesn't exist, and the new guardrail (line 73) forbids the previous tracing + span_traceId path. The Step 6 fallback (line 42) doesn't cover Step 1, so the agent has no allowed route. Suggest adding the same "if tracing-detail is not available, say so and stop / ask for more data" fallback here.

[brycebaril]

Fixed in 1f2c83c. Step 1's trace-ID path now has its own fallback: if tracing-detail isn't available (consoles before 6.5.2), errors, or returns no spans, the agent says the trace couldn't be read and asks for the trace data or another ID. The guardrail against tracing with span_traceId stays, so there's no silent wrong route.

[Cesar-M-Diaz]

Paging without a sort can duplicate or skip spans. GETTracingBySpanTraceId and _GETTracingBySpanTraceIdOTel paginate with from/size and no sort, so pages aren't stable (especially while a live trace is still being ingested). Default showLimit is 25, so a 200-span trace takes 8 sequential calls. normalizePositiveInteger has no upper cap, so a cheaper/safer approach is one call with a large showLimit (or re-request once with showLimit >= totalSpans from the first page's metadata), bounded by ES's 10k window. Minor.

[brycebaril]

Agreed, and confirmed: neither GETTracingBySpanTraceId nor the OTel variant sorts, and normalizePositiveInteger has no cap. Fixed in 1f2c83c. The skill asks for the whole trace in one call (showLimit: 1000). If totalSpans is larger, it calls once more with showLimit at least totalSpans, at most 10000 for ES's result window. It says not to page with page, since unsorted pages can repeat or skip spans.

[Cesar-M-Diaz]

tracing-detail returns spans in no defined order. Neither GETTracingBySpanTraceId nor its OTel variant adds a sort to the ES query, so hits come back in score/doc order. To reason about "which run one after another when they could run in parallel", the skill should tell the agent to order spans by span_start/span_end first; otherwise it may read response order as execution order and misclassify Promise.all children.

[brycebaril]

Fixed in 1f2c83c. Step 6 has the agent sort the spans by span_start before building the waterfall, and says response order is not execution order. "One after another" is now defined as one span starting after the previous ends. A guardrail repeats it: read tracing-detail spans in span_start order.

[Cesar-M-Diaz]

This can override a user-supplied trace tree. This bullet calls tracing-detail unconditionally for "the slow or failing trace", and the Step 1 "do not fall through to live enrichment" list only names information-dashboard and tracing. If the user supplied an exported tree that includes its trace ID, the agent may fetch live (possibly paged/partial) spans and analyze those instead of the authoritative export. Suggest gating this bullet on "no trace tree was supplied" and adding tracing-detail to the Step 1 exclusion list.

[brycebaril]

Fixed in 1f2c83c. Step 6's tracing-detail call is gated on "no trace tree was supplied", and Step 1's exclusion list now names tracing-detail too. It applies "even when the export includes its trace ID".

[Cesar-M-Diaz]

Fallback only covers the tool being absent, not failing or empty. When Elastic isn't configured, GET-tracing-detail.js returns elasticReader is not available (surfaced as an MCP error), and an aged-out or wrong trace ID returns totalSpans: 0. In both cases the tool is listed, so this fallback doesn't trigger and there's no guidance. Suggest: "If tracing-detail is unavailable, errors, or returns no spans, stay with the collapsed trace-list evidence and say the waterfall was not available."

[brycebaril]

Fixed in 1f2c83c. The fallback now covers all three cases: not among the tools (before 6.5.2), an error (such as elasticReader is not available), or no spans (totalSpans: 0). In triage it stays with the collapsed trace-list evidence and says the waterfall wasn't available. On the trace-ID-only path it asks the user for the data instead.

[Cesar-M-Diaz]

Nit: the description now says the skill always builds the waterfall with tracing-detail, which isn't true on consoles < v6.5.2 (and the body still supports that case). Maybe "Builds the span waterfall with tracing-detail when available".

[brycebaril]

Done in 1f2c83c: "Builds the span waterfall with tracing-detail when the console offers it."

[brycebaril]

Thanks for checking this against master. Every point held up when I read the code, and 1f2c83c addresses all of them, including the two outside the diff hunks:

1. Step 5 and metadata.total: it now says metadata.total covers the whole rounded window from Step 3, so it shows the app had matching traces in that window, not in a shorter one the user asked about. Steps 3 and 5 now describe the same window.
2. The default window: Step 3 says that without start, tracing covers the last 23–24 hours (from 23 hours ago, rounded down). For recent behavior the agent passes start at the current hour, and the report must not present a day of data as current.

The rest are answered inline.

[Cesar-M-Diaz]

Re-reviewed at 1f2c83c against nsolid-console-ng master (74adf6a32). All eight inline notes and both out-of-diff points (Step 5's metadata.total, the 23–24 h default window) are addressed, and the new claims check out: totalSpans and span_start are in the tracing-detail response, elasticReader is not available is the literal error, normalizePagination has no cap, and tracing-detail isn't summarized over MCP. Approving.

Not blocking. The inline note on showLimit: 1000 matters most; two more outside the diff:

• Step 10 (Validate) mixes pre- and post-deploy traces. It's a direct consequence of the hour rounding this PR documents. Deploy at 10:40, re-run tracing, and start rounds to 10:00: the summary's min/max/median blend traces from before and after the fix, so "p95 dropped from X to Y" is contaminated. Measuring from the first full hour after the deploy, and saying so, keeps the comparison clean.
• Nit, Step 3: "pass start at the current hour" gives 5 minutes of data at 10:05. It could suggest the previous full hour, or mention that end isn't rounded (GET-tracing.js:28-32), so it can bound the window's end.

[Cesar-M-Diaz]

showLimit: 1000 can blow past the client's MCP output limit. This follows my earlier suggestion of one large call, which fixes the unstable paging but doesn't account for size. tracing-detail isn't in SUMMARIZE_CONFIG and GETTracingBySpanTraceId returns each hit's full _source, so every span reaches the agent raw. The span in web/test/acceptance/fixtures/tracing/tracing-1h is ~514 bytes with only 17 fields; real ones with HTTP/DB attributes (or OTel resource attributes) are larger. By rough estimate, somewhere around 100–150 spans already exceeds Claude Code's default MCP output cap (MAX_MCP_OUTPUT_TOKENS, 25k tokens), and a 1000-span trace is well over 150k tokens. The large traces are exactly the N+1 cases this skill is for.

Suggestion: ask for showLimit: 150 first. If totalSpans fits, that's the whole trace. If not, don't pull up to 10000: say the waterfall covers an unordered subset of returnedSpans out of totalSpans. That is still enough to show repetition by span_name (N+1), but not to claim the critical path or totals.

Longer term, a sort on span_start (with span_id as a tiebreak) in GETTracingBySpanTraceId and its OTel variant would make page stable again. That's a console-ng change, not for this PR.

[brycebaril]

Good catch. Fixed in 6b782e5, with your suggestion:

• Step 1 asks tracing-detail for showLimit: 150, and says why: every span comes back whole. A trace whose totalSpans is at most 150 is whole.
• For a bigger trace it does not ask for more. It says the waterfall covers returnedSpans of totalSpans spans, in no particular order: enough to show repeated span names (an N+1), not the critical path or totals. Step 6 points back to it, and a guardrail repeats it.
• No more 10000. The sort in the console's GETTracingBySpanTraceId would be its own change, as you say.