Ratel Langsmith Analyze

/ratel-langsmith-analyze — read live runs, propose fixes

Pull aggregates and outlier runs from the LangSmith MCP server (or the langsmith SDK as a fallback), pattern-match against the catalog of known agent failure modes, and write a findings report the customer can act on this week. Two grouped outputs: Ratel-flavored opportunities (where we'd integrate or deepen Ratel) and general low-hanging fruit (anyone could fix it).

The general findings are not filler — they're how we earn trust. A consultant who only ever recommends their own product looks like a salesperson. We're not that.

LangSmith's data model is projects → traces → run trees. A trace is a root run with a tree of child runs; each run has a run_type of chain, llm, tool, retriever, parser, prompt, or embedding. Sessions/conversations are carried as a thread_id / session_id metadata key set on the runs. Keep this model in mind: a "trace" in the Langfuse sense maps to a root run here, and an "observation" maps to a child run.

What good output looks like

A finding is good if:

1. It cites at least one run id or trace id, or a saved filter URL / filter string, so the customer can verify it themselves.
2. It says what to do, not just what's wrong. Vague findings ("error rate is high") waste partner time.
3. It says why the fix matters — in one sentence the customer's PM can read.
4. It's tagged Ratel or generic. Mixing them hides the value story.
5. If it's a Ratel-flavored finding, it cites the Ratel version that solves it — pull the conceptual signal → version mapping from the shared [ratel-value-map.md](../ratel-observability-assessment/references/ratel-value-map.md) (vendor-neutral source of truth; today's baseline is the v0.1.6 line).

A finding is bad if:

• It's a restatement of a dashboard ("p50 latency is 4.2s"). The LangSmith Monitor tab already shows that.
• It uses qualifiers like "could potentially be improved" or "may be worth investigating". Either it's a finding or it isn't.
• It's invented to fill space.

Workflow

Step 1 — Verify MCP availability (or fall back to the SDK)

Confirm a LangSmith read surface is reachable. There are two MCP options and one SDK fallback:

# Preferred: confirm LangSmith MCP tools are present.
# Via the Ratel gateway: search_capabilities(query="langsmith runs traces threads datasets")
# Or inspect Claude Code's MCP config for one of:
#   - the Remote MCP (OAuth):      https://api.smith.langchain.com/mcp
#     (EU region: https://eu.api.smith.langchain.com/mcp; self-hosted: /api/mcp, LangSmith v0.15+)
#   - the standalone server:       langsmith-mcp-server (uvx / PyPI; LANGSMITH-API-KEY header)

If no LangSmith MCP server is reachable, fail fast:

> LangSmith MCP server not detected. Run /ratel-langsmith-integrate first to register the Remote MCP (https://api.smith.langchain.com/mcp, OAuth) or the standalone langsmith-mcp-server, then re-run this skill.

SDK fallback (offline / no MCP). If MCP can't be registered but LANGSMITH_API_KEY and a project name are available, you may analyze directly with the langsmith Python SDK — Client.list_runs(...), read_run(run_id, load_child_runs=True), and run-stats — driving it through Bash. The query shapes for both paths live in [references/query-patterns.md](references/query-patterns.md). When you use the SDK path, say so in the report header (the data is the same; only the access path differs).

Do not proceed without one of these. This skill is useless without live data.

Step 2 — Scope the window

Ask the user (or accept from invocation):

• Time range (default: last 24h or last 100 root runs, whichever is smaller).
• Project — LangSmith partitions runs by project; you must know which project_name to read.
• Optional filters (thread_id / session_id, run name, run_type, tags, env metadata).
• Optional Ratel feature-flag arm to focus on (e.g., a feature_flag / tool_pool metadata value or tag) — useful when running an A/B engagement.

Print the chosen scope back in chat so the customer knows what was analysed.

Step 3 — Pull aggregates

Use the queries in [references/query-patterns.md](references/query-patterns.md) to pull, in order:

1. Root-run count + p50/p99 latency + total tokens/cost + error rate, for the window (run-stats over is_root runs).
2. Top 10 root runs by latency, by token/cost, by child-run count.
3. Top 10 most-called tools (run_type = "tool"), top 10 erroring runs (error = true).
4. Feedback-score distributions for any feedback keys in use.
5. Per-feature_flag (or per-tool_pool) split if any such tag / metadata key is set.

This frames the rest of the analysis. It also surfaces the trivial-but-important findings ("thread_id is missing on 80% of root runs" — discoverable from a single aggregate).

Step 4 — Drill into outliers

Fetch full run trees for:

• The single slowest root run.
• The single most-expensive (highest-token) root run.
• A root run from the top of the "errors" list.
• The lowest-scored thread (if feedback exists).
• Two random root runs from the typical-latency bucket as a control.

Load child runs (read_run(..., load_child_runs=True) or the MCP equivalent) and read inputs and outputs. Don't just look at the run tree's shape — what did the agent actually do? The most valuable findings come from reading transcripts.

Step 5 — Pattern-match against the shared finding catalog

Open the shared [finding-catalog.md](../ratel-observability-assessment/references/finding-catalog.md) (vendor-neutral; owned by ratel-observability-assessment). For each pattern: check whether the data the customer has emitted matches the detection heuristic, translating the catalog's generic vocabulary onto LangSmith primitives (unit-of-work → root run, step → child run, tool call → tool run, model call → llm run, session → thread_id). If it matches, emit a finding using the pattern's template.

Don't iterate the catalog blindly — if Ratel isn't in the system, skip the entire Ratel section. If there are no feedback scores, skip score-related patterns. The catalog is a sieve, not a checklist.

Step 6 — Generate the findings

Each finding follows this template:

### F. 

- **Severity**: high | medium | low
- **Category**: ratel | generic
- **Evidence**: run ids / trace ids / filter string / filter URL / aggregate value
- **Why this matters**: 
- **Recommended action**: 
- **Solved by Ratel?**:  (only for ratel category)

Severity rubric:

• high — affects more than 10% of traffic, or any data quality issue that breaks the Monitor tab / custom dashboards.
• medium — affects a meaningful slice but isn't load-bearing.
• low — observed but small; worth noting once.

Group findings by severity (high → low) within each category (ratel, generic). Cap at 10 findings per category to keep the report actionable. Above 10, write "(N more findings rolled into a follow-up batch)" and capture the rest in an appendix.

For the Ratel category, take the conceptual signal → Ratel version mapping from the shared [ratel-value-map.md](../ratel-observability-assessment/references/ratel-value-map.md). Don't hard-code version claims here.

Step 7 — Write the report

Output to /.ratel/langsmith-analysis-.md. Reports accumulate (one per run); don't overwrite previous ones. The directory should be the same one /ratel-langsmith-integrate writes to.

Structure:

# LangSmith analysis — 

## Scope
- Project: 
- Window: 
- Access path: 
- Filters: 
- Root runs analysed: 
- Findings: , , 

## Aggregates at a glance

## Findings — Ratel-flavored

## Findings — Generic

## Honest skip (if applicable)

## Appendix — raw query results

Print the top 3 findings (across both categories, highest severity) inline in chat with one-line summaries. Tell the user the file path for the rest.

Honest skip path

If the data is genuinely clean — error rate below 1%, no latency outliers, no missing-thread_id issue, no feedback regressions, no tool drift — write a short report saying so:

> No findings worth acting on this week. root runs analysed in ; aggregate health is within normal ranges. The next time this might be worth re-running is when traffic grows past or a new agent version deploys.

This is not failure — it's signal. Partners trust consultants who tell them when there's nothing to fix. Don't manufacture findings. A noisy report once trains the customer to ignore future reports forever.

Equally — if traffic is too thin to draw conclusions (fewer than ~20 root runs in the window), say so:

> Only root runs in the window. Re-run after the customer's next traffic-bearing release / next test campaign. Aggregates included for reference but no findings drawn.

Reference files

• [references/query-patterns.md](references/query-patterns.md) — vetted LangSmith MCP tool query shapes + langsmith SDK list_runs filter patterns (aggregate, drill-down, sample)
• [finding-catalog.md](../ratel-observability-assessment/references/finding-catalog.md) — the shared, vendor-neutral catalog of detection patterns + recommended fixes + Ratel mapping (owned by ratel-observability-assessment)
• [ratel-value-map.md](../ratel-observability-assessment/references/ratel-value-map.md) — the shared, vendor-neutral source of truth for "what Ratel ships when" (conceptual signal → version), read when tagging Ratel-flavored findings

Where this sits in the arc

This skill is the follow-up that /ratel-langsmith-integrate routes to once tracing is live. Upstream: /ratel-assessment → /ratel-observability-assessment (vendor detection + neutral proposal) → /ratel-langsmith-integrate (concrete wiring + dashboards) → this skill (read the live data, propose fixes).

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: ratel-ai
• Source: ratel-ai/skills
• License: MIT

Install and usage instructions live in the source repository linked above.