{ "data": { "a": { "slug": "gauge-cli", "name": "Gauge CLI", "vendor": "Gauge", "vendorUrl": "https://www.withgauge.com/agents/", "kind": "cli", "category": "agent-observability", "summary": "Gauge CLI runs real coding agents (Claude Code, Codex, Pi, OpenCode) against your skills, CLIs, SDKs, MCP servers and docs in Docker, records where they get stuck, and lets your agent test fixes before release.", "url": "https://www.anchorterminal.com/tools/gauge-cli", "markdownUrl": "https://www.anchorterminal.com/tools/gauge-cli.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/gauge-cli.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/gauge-cli.json", "dns": "gauge-cli.grade.anchorterminal.com", "repo": "https://github.com/gauge-sh/gauge-cli", "license": "MIT", "transports": [], "packages": [ { "registry": "npm", "name": "@withgauge/cli" } ], "auth": "none", "authNotes": "Local mode needs no Gauge account, only credentials for the agent under test (native Claude or Codex logins, or API keys). Hosted Gauge uses `gauge auth login`, with a device flow for remote terminals.", "pricing": "freemium", "pricingNotes": "The CLI and local mode are free and MIT-licensed; agent usage is billed by your provider or subscription. Hosted Gauge runs on workspace credits, whose prices weren't read (checked 2026-11-06).", "priceSummary": "Freemium", "where": "local", "x402": { "level": "no", "evidence": "No payment protocol in the CLI or its README; hosted runs use workspace credits (checked 2026-11-06).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-06" }, "docsUrl": "https://docs.withgauge.com/agents", "capabilities": [ "obs.evals" ], "tags": [ "open-source", "mit", "cli", "node", "docker", "telemetry", "new" ], "lastRelease": "2026-11-04", "graded": true, "anchor": { "graded": true, "score": 60.4, "grade": "C", "agentReady": false, "rank": 590, "ranked": true, "rankOf": 1354, "categoryRank": 13, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 75, "maintenance": 82, "payments": 40, "reliability": 60, "schema": 60, "security": 55, "transparency": 53 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "low", "date": "2026-11-06" }, "negative": 0, "verdict": "An open-source CLI that measures how coding agents get on with your product and checks fixes before you ship them, locally in Docker with no account. It's young and pre-1.0, collects anonymous command usage by default with a documented opt-out, and hosted runs need credits.", "bestFor": "Teams that build skills, CLIs, SDKs or MCP servers and want to see where coding agents get stuck with them, and to test fixes before release.", "strengths": [ "Runs Claude Code, Codex, Pi and OpenCode in fresh Docker sessions against working-tree or pre-release versions", "Local mode needs no Gauge account, only your existing agent credentials", "Dated changelog with six releases in about two weeks", "Instructions bundled in the CLI for coding agents, and -o json on read commands", "CI runs checks on every push and pull request" ], "weaknesses": [ "Collects anonymous command usage by default, with an opt-out", "Pre-1.0 and about two weeks old in this repository", "Docs, authenticated MCP servers and authenticated APIs need hosted Gauge and credits", "Hosted credit prices weren't found on the pages read" ], "agentNotes": [ "npm install -g @withgauge/cli, then gauge local runtime pull and gauge init --local in the project", "Run gauge install-skill so your coding agent finds the CLI's own instructions", "Set GAUGE_TELEMETRY_DISABLED=1 in CI if you don't want command usage collected", "Rebuild and pack an npm CLI or SDK before rerunning, so test sessions get the new tarball", "Keep .gauge/ private; it holds measurements and analyses" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "low", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 60.4 } ], "editorialScores": { "ergonomics": 75, "maintenance": 82, "payments": 40, "reliability": 60, "schema": 60, "security": 55, "transparency": 78 }, "provenanceScore": 27, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "npm install -g @withgauge/cli\ngauge local runtime pull\ngauge init --local\ngauge install-skill" }, "letme": { "capability": "https://letme.dev/obs.evals", "tool": "https://letme.dev/gauge-cli" }, "area": "developer", "provenance": { "legalEntity": "", "domain": "withgauge.com", "domainRegistered": "", "domainNote": "Not looked up: RDAP isn't requested under the 1 November 2026 rules.", "endpointOnVendorDomain": null, "terms": "", "privacy": "", "statusPage": "", "changelog": "https://github.com/gauge-sh/gauge-cli/blob/main/cli/CHANGELOG.md", "securityTxt": "none", "checked": "2026-11-06", "notes": [ "The npm package's author is Gauge \u003csupport@withgauge.com\u003e, its homepage agents.withgauge.com, and its repository field points at gauge-sh/gauge-cli. The licence names Gauge.", "Hosted Gauge's terms and privacy weren't read, and security.txt wasn't checked." ], "score": 27 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/gauge-cli.json" }, "answer": "LangSmith API + MCP scores 71.6 (BB) on agent readiness against Gauge CLI's 60.4 (C), and leads in 6 of 7 scored categories.", "b": { "slug": "langsmith", "name": "LangSmith API + MCP", "vendor": "LangChain", "vendorUrl": "https://www.langchain.com/langsmith", "kind": "http-api", "category": "agent-observability", "summary": "LangChain's hosted tracing, evaluation, prompt hub and dataset platform, framework-agnostic with Python and TypeScript SDKs and OpenTelemetry ingest.", "url": "https://www.anchorterminal.com/tools/langsmith", "markdownUrl": "https://www.anchorterminal.com/tools/langsmith.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/langsmith.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/langsmith.json", "dns": "langsmith.grade.anchorterminal.com", "repo": "https://github.com/langchain-ai/langsmith-python", "license": "MIT (SDK only, platform closed source)", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.smith.langchain.com", "packages": [ { "registry": "pypi", "name": "langsmith" }, { "registry": "npm", "name": "langsmith" } ], "auth": "mixed", "authNotes": "API key in the `X-Api-Key` header (personal or service keys, workspace-scoped). The remote MCP server uses OAuth 2.1 with dynamic client registration for interactive clients, or the same API key header for headless ones.", "pricing": "freemium", "pricingNotes": "Developer is free for 1 seat with 5,000 base traces a month. Plus $39 a seat a month with 10,000 base traces, unlimited seats and one free small deployment. Enterprise custom. Beyond the included traces, a base trace costs 0.005 LSU ($5 per 1,000 at $1 an LSU) with 14-day retention, and upgrading to an extended trace with 180-day retention adds 0.0025 LSU. Compute for deployments, sandboxes and tuned evaluators is billed in LCUs at $1.50 each. Self-hosting and BYOC are Enterprise only (https://www.langchain.com/pricing).", "priceSummary": "$39 / seat-mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 support in docs or pricing (checked 2026-09-30).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 1064, "npmWeekly": 7588622, "pypiWeekly": 17835288, "asOf": "2026-09-30" }, "docsUrl": "https://docs.langchain.com/langsmith/observability", "llmsTxt": "https://docs.langchain.com/llms.txt", "openapi": "https://api.smith.langchain.com/openapi.json", "capabilities": [ "obs.traces", "obs.evals", "obs.prompts", "obs.datasets", "obs.gateway" ], "tags": [ "hosted", "freemium", "closed-source", "mcp", "llms-txt", "openapi", "python", "typescript", "enterprise", "webhooks" ], "lastRelease": "2026-10-31", "graded": true, "anchor": { "graded": true, "score": 71.6, "grade": "BB", "agentReady": true, "rank": 137, "ranked": true, "rankOf": 1354, "categoryRank": 4, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 76, "maintenance": 85, "payments": 40, "reliability": 81, "schema": 86, "security": 79, "transparency": 78 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-01" }, "negative": -4, "negativeNotes": [ "2026-02-09 to 2026-06-19. Five published advisories in the LangSmith SDK. The most serious, GHSA-f4xh-w4cj-qxq8 (CVE-2026-59152, 19 June), let anyone who could send HTTP requests to a server running `TracingMiddleware` read arbitrary files from it into trace attachments, fixed in Python 0.8.18. GitHub's list rates it critical and the advisory scores it CVSS 5.0. The others cover untrusted public prompt manifests (high, 7 May), streaming tokens bypassing output redaction (moderate, 14 April), prototype pollution (moderate, 9 April) and SSRF through tracing headers (moderate, 9 February). All fixed and disclosed in public, so -4 (https://github.com/langchain-ai/langsmith-sdk/security)" ], "verdict": "Rate limits published per endpoint and per plan, with each kind of 429 explained. Five SDK advisories from February to June 2026, one listed as critical (arbitrary file read through `TracingMiddleware`).", "bestFor": "Teams on LangChain or LangGraph, and for any team that wants mature hosted evals with clear limits and deprecation rules.", "strengths": [ "Rate limits published per endpoint and per plan, with each kind of 429 explained", "Written deprecation policy, six months on cloud, with `Deprecation` and `Sunset` headers on deprecated endpoints", "Remote MCP with OAuth 2.1, read-only in practice, and `fetch_runs` paging by a 25,000-character budget", "Workspace-scoped service keys with expiry, and audit logs queryable by API on Enterprise", "SOC 2 Type II, HIPAA and GDPR, regions in the US, EU and APAC, and SDK advisories published with CVEs", "Tracing-only keys can send traces from an agent without being able to read them" ], "weaknesses": [ "Five SDK advisories from February to June 2026, one listed as critical (arbitrary file read through `TracingMiddleware`)", "`POST /feedback/eager` was removed on 10 August after about a month's notice, given before the six-month policy was published on 27 July", "Closed-source platform, self-hosting, BYOC and key roles are Enterprise only", "Four MCP tools named like writes (`create_dataset`, `run_experiment` and others) only return documentation", "No uptime SLA found below Enterprise's support SLA" ], "agentNotes": [ "Batch run reads. `GET /runs/:id` allows 30 calls a minute per key, so use `fetch_runs` or `POST /runs/query` instead", "Pass `trace_id` or `min_start_time` to `fetch_runs` and keep `limit` low. Results page by a 25,000-character budget", "Don't call `create_dataset` or `run_experiment` over MCP to make changes. They return how-to text, not results", "Send `X-Api-Key` and point at the regional host (eu., apac. or aws.api.smith.langchain.com) that matches the workspace", "Move off the v1 runs query and retrieve endpoints before their 31 January 2027 sunset", "Give a tracing agent a tracing-only key (`lsv2_tr_` prefix), not a personal or service key, so a leak can't read traces" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "BB", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 71.6 } ], "editorialScores": { "ergonomics": 76, "maintenance": 85, "payments": 40, "reliability": 81, "schema": 86, "security": 79, "transparency": 70 }, "provenanceScore": 85, "checked": { "categories": { "ergonomics": "2026-11-01", "maintenance": "2026-11-01", "payments": "2026-11-01", "reliability": "2026-11-01", "schema": "2026-11-01", "security": "2026-11-01", "transparency": "2026-11-01" }, "last": "2026-11-01", "lastMoved": "2026-11-01", "oldest": "2026-11-01", "stale": false, "staleAfterDays": 90 } }, "connect": { "http": "curl https://api.smith.langchain.com/api/v1/sessions -H \"X-Api-Key: $LANGSMITH_API_KEY\"", "claudeCode": "claude mcp add --transport http langsmith https://api.smith.langchain.com/mcp" }, "letme": { "capability": "https://letme.dev/obs.traces", "tool": "https://letme.dev/langsmith" }, "sameCompany": [ "langgraph", "langmem" ], "area": "developer", "unitPrices": [ { "item": "Plus plan", "unit": "seat-month", "usd": 39, "note": "10,000 base traces a month included" }, { "item": "Base traces", "unit": "1k-requests", "usd": 5, "note": "0.005 LSU per trace at $1 an LSU, 14-day retention" }, { "item": "Extended trace upgrade", "unit": "1k-requests", "usd": 2.5, "note": "0.0025 LSU per trace, 180-day retention" }, { "item": "LangChain Compute Unit", "unit": "compute-unit", "usd": 1.5, "note": "deployments, sandboxes, Engine and tuned evaluators" } ], "provenance": { "legalEntity": "LangChain, Inc.", "domain": "langchain.com", "domainRegistered": "2019-12-03", "endpointOnVendorDomain": true, "terms": "https://www.langchain.com/terms-of-service", "privacy": "https://www.langchain.com/privacy-policy", "statusPage": "https://status.smith.langchain.com", "changelog": "https://docs.langchain.com/langsmith/changelog", "securityTxt": "none", "checked": "2026-11-01", "score": 85 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/langsmith.json", "live": { "slug": "langsmith", "probe": { "target": "https://api.smith.langchain.com", "method": "get", "lastAt": "2026-11-06T09:47:35.085193143Z", "lastOk": true, "lastStatus": 404, "lastMs": 157, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 158, "p95ms24h": 226, "samples24h": 221, "samples30d": 7856, "days": [ { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 247 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 249 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 249 }, { "date": "2026-10-28", "probes": 251, "ok": 251 }, { "date": "2026-10-29", "probes": 248, "ok": 248 }, { "date": "2026-10-30", "probes": 249, "ok": 249 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 249 }, { "date": "2026-11-02", "probes": 250, "ok": 250 }, { "date": "2026-11-03", "probes": 248, "ok": 248 }, { "date": "2026-11-04", "probes": 246, "ok": 246 }, { "date": "2026-11-05", "probes": 185, "ok": 185 }, { "date": "2026-11-06", "probes": 102, "ok": 102 } ] }, "vendorStatus": { "page": "https://status.smith.langchain.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-11-06T05:41:55.431156716Z" }, "versions": [ { "registry": "github", "name": "langchain-ai/langsmith-python", "version": "v0.14.17", "released": "2026-11-02", "seenAt": "2026-11-05T21:42:10.004352865Z" }, { "registry": "github", "name": "langchain-ai/langsmith-sdk", "version": "v0.14.9", "released": "2026-10-15", "seenAt": "2026-11-01T17:09:58.756264955Z" }, { "registry": "npm", "name": "langsmith", "version": "0.11.8", "seenAt": "2026-11-05T21:42:09.188136442Z" }, { "registry": "pypi", "name": "langsmith", "version": "0.14.17", "released": "2026-11-02", "seenAt": "2026-11-05T21:42:08.987425811Z" } ], "githubStars": 23, "npmWeekly": 10117006, "pypiWeekly": 21914071, "securityTxt": { "url": "https://langchain.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-05T15:55:06.471938405Z" }, "llmsTxt": { "url": "https://docs.langchain.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-05T15:26:23.591882494Z" }, "domain": { "domain": "langchain.com", "registered": "2019-12-03", "source": "https://rdap.verisign.com/com/v1/domain/langchain.com", "checkedAt": "2026-11-01T14:16:16.486101867Z" }, "pages": [ { "url": "https://docs.langchain.com/langsmith/changelog", "kind": "deprecations", "status": 304, "checkedAt": "2026-11-05T12:52:49.985657761Z", "changedAt": "2026-11-05T12:30:43.404023439Z", "fingerprint": "37d1a9d5af88" }, { "url": "https://www.langchain.com/pricing", "kind": "pricing", "status": 304, "checkedAt": "2026-11-05T13:14:17.747326186Z", "changedAt": "2026-11-03T08:07:38.45717903Z", "fingerprint": "3ebbc86fdd0b" }, { "url": "https://www.langchain.com/privacy-policy", "kind": "privacy", "status": 304, "checkedAt": "2026-11-05T13:14:19.842546025Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "83d57e07b1e6" }, { "url": "https://www.langchain.com/terms-of-service", "kind": "terms", "status": 304, "checkedAt": "2026-11-05T13:14:21.846610854Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "bafbaf0129ca" } ], "github": { "repo": "langchain-ai/langsmith-python", "checkedAt": "2026-11-02T08:59:44.896915059Z", "stars": 22, "archived": false, "issuesEnabled": true, "pushedAt": "2026-11-02T00:59:00Z", "openIssues": 17, "openPRs": 34, "issuesOpened90d": 14, "issuesClosed90d": 0, "prsMerged90d": 23, "ci": { "branch": "main", "runs": 50, "success": 48, "failure": 2, "other": 0, "latest": "success", "latestAt": "2026-11-02T01:59:42Z" }, "replies": { "sampled": 17, "unanswered": 17 } }, "updatedAt": "2026-11-06T09:47:35.085193143Z" } }, "edges": [ { "by": 26, "category": "schema", "leads": "langsmith", "name": "Schema \u0026 documentation", "reasons": { "a": "CLI reading. No machine-readable contract, -o json on read commands (10 of 25). No llms.txt; instructions bundled in the CLI for agents (5). The README says what it finds and when local or hosted fits (16 of 20). Commands with help text; typed flags (9 of 15). Worked examples, no error reference (8 of 15). Dated changelog and semver tags (12 of 15). 10 + 5 + 16 + 9 + 8 + 12 = 60.", "b": "Public OpenAPI 3.1 at api.smith.langchain.com/openapi.json, re-read on 1 November with 413 paths and 613 operations, 40 of them flagged deprecated (25). llms.txt and Markdown docs (10). MCP tool docstrings are long and practical. `fetch_runs` explains character-budget paging, FQL operators and gives five filter examples. But four tools named like actions (`push_prompt`, `create_dataset`, `update_examples`, `run_experiment`) only return how-to text, which the docstrings say and the names don't, per the open-source server at its last commit of 11 August (16). Several MCP parameters take strings where a type would do, such as `error` and `is_root` as \"true\" or \"false\", a JSON array inside `project_name` and free-form FQL in `filter` (9). Examples throughout the docs and docstrings. Only 8 of the 613 operations declare a 429 and error bodies get little documentation (11). Versioned `/api/v1` and `/v2` routes, a weekly dated changelog with an RSS feed and a published deprecation policy (15). 25+10+16+9+11+15 = 86." }, "scores": { "a": 60, "b": 86 } }, { "by": 25, "category": "transparency", "leads": "langsmith", "name": "Transparency \u0026 trust", "reasons": { "a": "MIT (30). Local data stays in .gauge/ and telemetry fields are listed; hosted data handling wasn't read (18 of 30). Dated changelog, no deprecation policy (10 of 20). Telemetry on by default, disclosed with an opt-out (20). 30 + 18 + 10 + 20 = 78.", "b": "Closed platform. The SDKs and the open-source MCP server are MIT (18). Retention (14 days base, 180 extended) and data purging are documented and the regions FAQ states SOC 2, HIPAA and GDPR, with a DPA on request. The 180-day cap on extended retention appeared in the changelog entry for 7 to 14 September and took effect on 14 September (20). Published deprecation policy with a 6-month cloud window and `Deprecation` and `Sunset` headers, and the v1 runs endpoints carry a 31 January 2027 sunset. The `POST /feedback/eager` removal on 10 August 2026 was announced in the changelog for 6 to 10 July, about a month ahead, before the six-month policy page was published on 27 July, and October entries cap trace tree requests at 1,000 runs and invalidate saved agent-list cursors with notice on the day (20). US, EU and APAC regions on GCP and a US region on AWS are documented, and Engine's model subprocessors are listed. We couldn't read a full subprocessor list (12). 18+20+20+12 = 70." }, "scores": { "a": 53, "b": 78 } }, { "by": 24, "category": "security", "leads": "langsmith", "name": "Security \u0026 auth", "reasons": { "a": "Local tool. Agent credentials stay on your machine in local mode; hosted login with a device flow (20 of 30). Test agents run in fresh Docker sessions with injected inputs, and the gateway brokers credentials in hosted mode (12 of 20). Agents under test read your product's docs and outputs, with no prompt-injection guidance (5 of 15). Local transcripts and SQLite evidence per run (10 of 15). No security policy found (8 of 20). 20 + 12 + 5 + 10 + 8 = 55.", "b": "Personal access tokens inherit the user's permissions. Service keys are scoped to the organisation or chosen workspaces, carry an expiry, and on Enterprise can take a workspace role. Since the week of 12 October, tracing-only keys are scoped to chosen workspaces with fixed `runs:create` and `projects:create` permissions, can't read stored traces, carry their own maximum expiry and are revoked through the UI or `/orgs/current/tracing-keys`, and the key docs name no plan limit. The remote MCP uses OAuth 2.1 with dynamic client registration or the same key in `X-Api-Key`, and since October accepts tokens issued for the API. Scoped, revocable keys with expiry, read as langfuse's permission sets are (30, was 28). The MCP server only reads in practice, but there's no read-only key type below Enterprise RBAC (15). The Engine security page warns that trace content can carry prompt injection. The MCP page says nothing about it (6). Audit logs on Enterprise, queryable by API (10). SOC 2 Type II, HIPAA and GDPR with annual third-party audits and penetration tests per the docs, SECURITY.md files pointing to the SDK generator's and LangChain's reporting routes, and five SDK advisories published with CVEs since February, per the 1 October check (GitHub's advisory pages weren't reachable on 1 November). www.langchain.com answers \"Invalid .well-known request\" for security.txt, so none (18). 30+15+6+10+18 = 79." }, "scores": { "a": 55, "b": 79 } }, { "by": 21, "category": "reliability", "leads": "langsmith", "name": "Reliability", "reasons": { "a": "Local package. Installs from npm as @withgauge/cli with Node 22.13 or later and Docker stated (20). checks.yml runs npm run check on push and pull request across a matrix, and the repository has 76 test files; whether main passes wasn't read (20 of 25). Issues weren't read (5, unchecked). A dated changelog with Added sections per release (15). Version 0.28.0 (0). 20 + 20 + 5 + 15 + 0 = 60.", "b": "incident.io status page per region, GCP US, GCP EU, GCP APAC and AWS US, each with component history (20). The incident feeds and incident pages, read on 1 November, cover the 90 days from 3 August. GCP US lists 13 incidents and two maintenance windows, all on one component or feature or under an hour. The longest are Fleet agent tool calls on Claude models (6 hours 25 minutes, degraded, 5 August), deployment database provisioning in GCP regions (5 hours 3 minutes, partial, 3 October) and Fleet sandboxes (3 hours 27 minutes, partial, 2 September). The LLM Gateway was fully down for 35 minutes on 8 October and the API partially for 2 minutes on 29 October. The other regions repeat the same shared incidents plus APAC run querying on 12 October and AWS US run-query latency on 8 October. Minor only (20). Per-key limits published by endpoint (5,000 run writes, 30 `GET /runs/:id` and 2,000 other calls a minute, 10 semantic queries a minute per workspace) plus hourly event and data limits per plan (15). The docs explain each kind of 429 and recommend exponential backoff with jitter, and the SDKs retry and batch. Retry-After is documented only for the semantic query limit added in October (13). Enterprise has a support SLA. We found no uptime SLA (3). API and remote MCP are GA (10). 20+20+15+13+3+10 = 81." }, "scores": { "a": 60, "b": 81 } } ], "facts": [ { "a": "cli", "b": "HTTP API", "name": "Kind" }, { "a": "Gauge", "b": "LangChain", "name": "Vendor" }, { "a": "no (local only)", "b": "https://api.smith.langchain.com", "name": "Hosted endpoint" }, { "a": "", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "None", "b": "OAuth or key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "MIT", "b": "MIT (SDK only, platform closed source)", "name": "Licence" }, { "a": "no", "b": "yes", "name": "Read-only variant documented" }, { "a": "no", "b": "yes", "name": "llms.txt" }, { "a": "2026-11-04", "b": "2026-10-31", "name": "Last release" }, { "a": "no document linked", "b": "2026-06-02", "name": "Terms last updated" }, { "a": "no document linked", "b": "2024-04-28", "name": "Privacy policy last updated" }, { "a": "not read yet", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not read yet", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "not read yet", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "not read yet", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "not read yet", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "none", "b": "1.1k stars, 7.6M npm/wk, 17.8M PyPI/wk", "name": "Popularity" }, { "a": "none", "b": "3/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "LangSmith API + MCP scores 71.6 (BB) on agent readiness against Gauge CLI's 60.4 (C), and leads in 6 of 7 scored categories.", "question": "Which is better for AI agents, Gauge CLI or LangSmith API + MCP?" }, { "answer": "No hosted endpoint is listed for Gauge CLI. LangSmith API + MCP has a hosted endpoint at https://api.smith.langchain.com.", "question": "Can an agent call Gauge CLI and LangSmith API + MCP without installing anything?" }, { "answer": "Gauge CLI is open source (MIT). No open-source release is listed for LangSmith API + MCP.", "question": "Are Gauge CLI and LangSmith API + MCP open source?" } ], "goodFor": [ { "aheadOn": null, "also": [ "No key needed to call it", "Open source", "No incidents deducted, where LangSmith API + MCP loses 4 points for them" ], "goodFor": "Teams that build skills, CLIs, SDKs or MCP servers and want to see where coding agents get stuck with them, and to test fixes before release.", "slug": "gauge-cli", "watchFor": "Collects anonymous command usage by default, with an opt-out" }, { "aheadOn": [ "Reliability, 81 against 60", "Schema \u0026 documentation, 86 against 60", "Security \u0026 auth, 79 against 55", "Transparency \u0026 trust, 78 against 53" ], "also": [ "Agent-ready, a grade of BB or better", "A hosted endpoint, with nothing to install" ], "goodFor": "Teams on LangChain or LangGraph, and for any team that wants mature hosted evals with clear limits and deprecation rules.", "slug": "langsmith", "watchFor": "Five SDK advisories from February to June 2026, one listed as critical (arbitrary file read through `TracingMiddleware`)" } ], "history": { "gauge-cli": null, "langsmith": [ { "causes": [ "product" ], "date": "2026-11-01", "delta": 0.3, "from": 71.3, "fromGrade": "BB", "to": 71.6, "toGrade": "BB" }, { "causes": [ "method" ], "date": "2026-10-27", "delta": 0.2, "from": 71.1, "fromGrade": "BB", "to": 71.3, "toGrade": "BB" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.2, "from": 71.3, "fromGrade": "BB", "to": 71.1, "toGrade": "BB" } ] }, "job": { "capability": "obs.evals", "name": "Evaluations" }, "others": [ { "json": "https://www.anchorterminal.com/compare/agent-tree-vs-langsmith.json", "title": "Agent Tree vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/agent-tree-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/agents-tree-vs-langsmith.json", "title": "agents-tree vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/agents-tree-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/arize-phoenix-vs-langsmith.json", "title": "Arize Phoenix vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/arize-phoenix-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-langsmith.json", "title": "Baserun vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/baserun-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/botgauge-vs-langsmith.json", "title": "BotGauge vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/botgauge-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/braintrust-vs-langsmith.json", "title": "Braintrust API + MCP vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/braintrust-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/galileo-vs-langsmith.json", "title": "Galileo API + MCP vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/galileo-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/helicone-vs-langsmith.json", "title": "Helicone AI Gateway + MCP vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/helicone-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/honeyhive-vs-langsmith.json", "title": "HoneyHive vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/honeyhive-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/laminar-vs-langsmith.json", "title": "Laminar API + MCP vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/laminar-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/langfuse-vs-langsmith.json", "title": "Langfuse API + MCP vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/langfuse-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/langsmith-vs-langwatch.json", "title": "LangSmith API + MCP vs LangWatch", "url": "https://www.anchorterminal.com/compare/langsmith-vs-langwatch" }, { "json": "https://www.anchorterminal.com/compare/langsmith-vs-mlflow-tracing.json", "title": "LangSmith API + MCP vs MLflow Tracing", "url": "https://www.anchorterminal.com/compare/langsmith-vs-mlflow-tracing" }, { "json": "https://www.anchorterminal.com/compare/langsmith-vs-navige.json", "title": "LangSmith API + MCP vs Navige", "url": "https://www.anchorterminal.com/compare/langsmith-vs-navige" }, { "json": "https://www.anchorterminal.com/compare/langsmith-vs-opik.json", "title": "LangSmith API + MCP vs Opik API + MCP", "url": "https://www.anchorterminal.com/compare/langsmith-vs-opik" }, { "json": "https://www.anchorterminal.com/compare/langsmith-vs-overmind.json", "title": "LangSmith API + MCP vs Overmind", "url": "https://www.anchorterminal.com/compare/langsmith-vs-overmind" }, { "json": "https://www.anchorterminal.com/compare/langsmith-vs-prefactor.json", "title": "LangSmith API + MCP vs Prefactor", "url": "https://www.anchorterminal.com/compare/langsmith-vs-prefactor" }, { "json": "https://www.anchorterminal.com/compare/langsmith-vs-pydantic-logfire.json", "title": "LangSmith API + MCP vs Pydantic Logfire", "url": "https://www.anchorterminal.com/compare/langsmith-vs-pydantic-logfire" }, { "json": "https://www.anchorterminal.com/compare/langsmith-vs-respan.json", "title": "LangSmith API + MCP vs Respan API + MCP", "url": "https://www.anchorterminal.com/compare/langsmith-vs-respan" }, { "json": "https://www.anchorterminal.com/compare/langsmith-vs-wandb-weave.json", "title": "LangSmith API + MCP vs W\u0026B Weave", "url": "https://www.anchorterminal.com/compare/langsmith-vs-wandb-weave" }, { "json": "https://www.anchorterminal.com/compare/arize-phoenix-vs-gauge-cli.json", "title": "Arize Phoenix vs Gauge CLI", "url": "https://www.anchorterminal.com/compare/arize-phoenix-vs-gauge-cli" }, { "json": "https://www.anchorterminal.com/compare/baserun-vs-gauge-cli.json", "title": "Baserun vs Gauge CLI", "url": "https://www.anchorterminal.com/compare/baserun-vs-gauge-cli" }, { "json": "https://www.anchorterminal.com/compare/botgauge-vs-gauge-cli.json", "title": "BotGauge vs Gauge CLI", "url": "https://www.anchorterminal.com/compare/botgauge-vs-gauge-cli" }, { "json": "https://www.anchorterminal.com/compare/braintrust-vs-gauge-cli.json", "title": "Braintrust API + MCP vs Gauge CLI", "url": "https://www.anchorterminal.com/compare/braintrust-vs-gauge-cli" }, { "json": "https://www.anchorterminal.com/compare/deepeval-vs-gauge-cli.json", "title": "DeepEval vs Gauge CLI", "url": "https://www.anchorterminal.com/compare/deepeval-vs-gauge-cli" }, { "json": "https://www.anchorterminal.com/compare/deepeval-vs-langsmith.json", "title": "DeepEval vs LangSmith API + MCP", "url": "https://www.anchorterminal.com/compare/deepeval-vs-langsmith" }, { "json": "https://www.anchorterminal.com/compare/galileo-vs-gauge-cli.json", "title": "Galileo API + MCP vs Gauge CLI", "url": "https://www.anchorterminal.com/compare/galileo-vs-gauge-cli" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-helicone.json", "title": "Gauge CLI vs Helicone AI Gateway + MCP", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-helicone" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-honeyhive.json", "title": "Gauge CLI vs HoneyHive", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-honeyhive" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-laminar.json", "title": "Gauge CLI vs Laminar API + MCP", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-laminar" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-langfuse.json", "title": "Gauge CLI vs Langfuse API + MCP", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-langfuse" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-langwatch.json", "title": "Gauge CLI vs LangWatch", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-langwatch" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-mlflow-tracing.json", "title": "Gauge CLI vs MLflow Tracing", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-mlflow-tracing" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-opik.json", "title": "Gauge CLI vs Opik API + MCP", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-opik" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-overmind.json", "title": "Gauge CLI vs Overmind", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-overmind" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-prefactor.json", "title": "Gauge CLI vs Prefactor", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-prefactor" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-pydantic-logfire.json", "title": "Gauge CLI vs Pydantic Logfire", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-pydantic-logfire" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-respan.json", "title": "Gauge CLI vs Respan API + MCP", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-respan" }, { "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-wandb-weave.json", "title": "Gauge CLI vs W\u0026B Weave", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-wandb-weave" } ], "panel": null, "scores": [ { "by": 21, "edge": "langsmith", "gauge-cli": 60, "key": "reliability", "langsmith": 81, "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 26, "edge": "langsmith", "gauge-cli": 60, "key": "schema", "langsmith": 86, "name": "Schema \u0026 documentation", "weight": 13 }, { "by": 1, "edge": "langsmith", "gauge-cli": 75, "key": "ergonomics", "langsmith": 76, "name": "Agent ergonomics", "weight": 13 }, { "by": 24, "edge": "langsmith", "gauge-cli": 55, "key": "security", "langsmith": 79, "name": "Security \u0026 auth", "weight": 14 }, { "by": 0, "edge": "", "gauge-cli": 40, "key": "payments", "langsmith": 40, "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 3, "edge": "langsmith", "gauge-cli": 82, "key": "maintenance", "langsmith": 85, "name": "Maintenance \u0026 community", "weight": 7 }, { "by": 25, "edge": "langsmith", "gauge-cli": 53, "key": "transparency", "langsmith": 78, "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "LangSmith API + MCP scores 71.6 (BB) on agent readiness against Gauge CLI's 60.4 (C), and leads in 6 of 7 scored categories. Both do evaluations.", "tasks": null, "tutorials": [], "verdicts": { "gauge-cli": "An open-source CLI that measures how coding agents get on with your product and checks fixes before you ship them, locally in Docker with no account. It's young and pre-1.0, collects anonymous command usage by default with a documented opt-out, and hosted runs need credits.", "langsmith": "Rate limits published per endpoint and per plan, with each kind of 429 explained. Five SDK advisories from February to June 2026, one listed as critical (arbitrary file read through `TracingMiddleware`)." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/gauge-cli-vs-langsmith", "json": "https://www.anchorterminal.com/compare/gauge-cli-vs-langsmith.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/gauge-cli-vs-langsmith.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/gauge-cli-vs-langsmith.min.md" }, "markdown": "LangSmith API + MCP scores 71.6 (BB) on agent readiness against Gauge CLI's 60.4 (C), and leads in 6 of 7 scored categories. Both do evaluations.\n\n- Gauge CLI: grade C, 60.4/100, rank #590 of 1354. Markdown https://www.anchorterminal.com/tools/gauge-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/gauge-cli.json\n- LangSmith API + MCP: grade BB, 71.6/100, rank #137 of 1354. Markdown https://www.anchorterminal.com/tools/langsmith.md · JSON https://www.anchorterminal.com/api/v1/tools/langsmith.json\n- Best agent tracing, monitoring and evaluation tools: https://www.anchorterminal.com/best/agent-observability/index.md\n- All 250 evals comparisons: https://www.anchorterminal.com/compare/agent-observability/index.md\n\n## Which one, for what\n\n### Gauge CLI (C)\n\nGood for: Teams that build skills, CLIs, SDKs or MCP servers and want to see where coding agents get stuck with them, and to test fixes before release.\n\nAlso in its favour:\n- No key needed to call it\n- Open source\n- No incidents deducted, where LangSmith API + MCP loses 4 points for them\n\nWatch for: Collects anonymous command usage by default, with an opt-out\n\n### LangSmith API + MCP (BB)\n\nGood for: Teams on LangChain or LangGraph, and for any team that wants mature hosted evals with clear limits and deprecation rules.\n\nAhead on:\n- Reliability, 81 against 60\n- Schema \u0026 documentation, 86 against 60\n- Security \u0026 auth, 79 against 55\n- Transparency \u0026 trust, 78 against 53\n\nAlso in its favour:\n- Agent-ready, a grade of BB or better\n- A hosted endpoint, with nothing to install\n\nWatch for: Five SDK advisories from February to June 2026, one listed as critical (arbitrary file read through `TracingMiddleware`)\n\n\n## Why the edge\n\n### Schema \u0026 documentation: LangSmith API + MCP +26\n\n- Gauge CLI (60): CLI reading. No machine-readable contract, -o json on read commands (10 of 25). No llms.txt; instructions bundled in the CLI for agents (5). The README says what it finds and when local or hosted fits (16 of 20). Commands with help text; typed flags (9 of 15). Worked examples, no error reference (8 of 15). Dated changelog and semver tags (12 of 15). 10 + 5 + 16 + 9 + 8 + 12 = 60.\n- LangSmith API + MCP (86): Public OpenAPI 3.1 at api.smith.langchain.com/openapi.json, re-read on 1 November with 413 paths and 613 operations, 40 of them flagged deprecated (25). llms.txt and Markdown docs (10). MCP tool docstrings are long and practical. `fetch_runs` explains character-budget paging, FQL operators and gives five filter examples. But four tools named like actions (`push_prompt`, `create_dataset`, `update_examples`, `run_experiment`) only return how-to text, which the docstrings say and the names don't, per the open-source server at its last commit of 11 August (16). Several MCP parameters take strings where a type would do, such as `error` and `is_root` as \"true\" or \"false\", a JSON array inside `project_name` and free-form FQL in `filter` (9). Examples throughout the docs and docstrings. Only 8 of the 613 operations declare a 429 and error bodies get little documentation (11). Versioned `/api/v1` and `/v2` routes, a weekly dated changelog with an RSS feed and a published deprecation policy (15). 25+10+16+9+11+15 = 86.\n\n### Transparency \u0026 trust: LangSmith API + MCP +25\n\n- Gauge CLI (53): MIT (30). Local data stays in .gauge/ and telemetry fields are listed; hosted data handling wasn't read (18 of 30). Dated changelog, no deprecation policy (10 of 20). Telemetry on by default, disclosed with an opt-out (20). 30 + 18 + 10 + 20 = 78.\n- LangSmith API + MCP (78): Closed platform. The SDKs and the open-source MCP server are MIT (18). Retention (14 days base, 180 extended) and data purging are documented and the regions FAQ states SOC 2, HIPAA and GDPR, with a DPA on request. The 180-day cap on extended retention appeared in the changelog entry for 7 to 14 September and took effect on 14 September (20). Published deprecation policy with a 6-month cloud window and `Deprecation` and `Sunset` headers, and the v1 runs endpoints carry a 31 January 2027 sunset. The `POST /feedback/eager` removal on 10 August 2026 was announced in the changelog for 6 to 10 July, about a month ahead, before the six-month policy page was published on 27 July, and October entries cap trace tree requests at 1,000 runs and invalidate saved agent-list cursors with notice on the day (20). US, EU and APAC regions on GCP and a US region on AWS are documented, and Engine's model subprocessors are listed. We couldn't read a full subprocessor list (12). 18+20+20+12 = 70.\n\n### Security \u0026 auth: LangSmith API + MCP +24\n\n- Gauge CLI (55): Local tool. Agent credentials stay on your machine in local mode; hosted login with a device flow (20 of 30). Test agents run in fresh Docker sessions with injected inputs, and the gateway brokers credentials in hosted mode (12 of 20). Agents under test read your product's docs and outputs, with no prompt-injection guidance (5 of 15). Local transcripts and SQLite evidence per run (10 of 15). No security policy found (8 of 20). 20 + 12 + 5 + 10 + 8 = 55.\n- LangSmith API + MCP (79): Personal access tokens inherit the user's permissions. Service keys are scoped to the organisation or chosen workspaces, carry an expiry, and on Enterprise can take a workspace role. Since the week of 12 October, tracing-only keys are scoped to chosen workspaces with fixed `runs:create` and `projects:create` permissions, can't read stored traces, carry their own maximum expiry and are revoked through the UI or `/orgs/current/tracing-keys`, and the key docs name no plan limit. The remote MCP uses OAuth 2.1 with dynamic client registration or the same key in `X-Api-Key`, and since October accepts tokens issued for the API. Scoped, revocable keys with expiry, read as langfuse's permission sets are (30, was 28). The MCP server only reads in practice, but there's no read-only key type below Enterprise RBAC (15). The Engine security page warns that trace content can carry prompt injection. The MCP page says nothing about it (6). Audit logs on Enterprise, queryable by API (10). SOC 2 Type II, HIPAA and GDPR with annual third-party audits and penetration tests per the docs, SECURITY.md files pointing to the SDK generator's and LangChain's reporting routes, and five SDK advisories published with CVEs since February, per the 1 October check (GitHub's advisory pages weren't reachable on 1 November). www.langchain.com answers \"Invalid .well-known request\" for security.txt, so none (18). 30+15+6+10+18 = 79.\n\n### Reliability: LangSmith API + MCP +21\n\n- Gauge CLI (60): Local package. Installs from npm as @withgauge/cli with Node 22.13 or later and Docker stated (20). checks.yml runs npm run check on push and pull request across a matrix, and the repository has 76 test files; whether main passes wasn't read (20 of 25). Issues weren't read (5, unchecked). A dated changelog with Added sections per release (15). Version 0.28.0 (0). 20 + 20 + 5 + 15 + 0 = 60.\n- LangSmith API + MCP (81): incident.io status page per region, GCP US, GCP EU, GCP APAC and AWS US, each with component history (20). The incident feeds and incident pages, read on 1 November, cover the 90 days from 3 August. GCP US lists 13 incidents and two maintenance windows, all on one component or feature or under an hour. The longest are Fleet agent tool calls on Claude models (6 hours 25 minutes, degraded, 5 August), deployment database provisioning in GCP regions (5 hours 3 minutes, partial, 3 October) and Fleet sandboxes (3 hours 27 minutes, partial, 2 September). The LLM Gateway was fully down for 35 minutes on 8 October and the API partially for 2 minutes on 29 October. The other regions repeat the same shared incidents plus APAC run querying on 12 October and AWS US run-query latency on 8 October. Minor only (20). Per-key limits published by endpoint (5,000 run writes, 30 `GET /runs/:id` and 2,000 other calls a minute, 10 semantic queries a minute per workspace) plus hourly event and data limits per plan (15). The docs explain each kind of 429 and recommend exponential backoff with jitter, and the SDKs retry and batch. Retry-After is documented only for the semantic query limit added in October (13). Enterprise has a support SLA. We found no uptime SLA (3). API and remote MCP are GA (10). 20+20+15+13+3+10 = 81.\n\n## Score by category\n\n| Category | Weight | Gauge CLI | LangSmith API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 60 | 81 | LangSmith API + MCP +21 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 60 | 86 | LangSmith API + MCP +26 |\n| Agent ergonomics | 13% (16.2 this run) | 75 | 76 | LangSmith API + MCP +1 |\n| Security \u0026 auth | 14% (17.5 this run) | 55 | 79 | LangSmith API + MCP +24 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 40 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 82 | 85 | LangSmith API + MCP +3 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 53 | 78 | LangSmith API + MCP +25 |\n| Negative events | ≤15 | 0 | -4 | |\n| **Total** | | **60.4 · C** | **71.6 · BB** | |\n\n## Facts side by side\n\n| Fact | Gauge CLI | LangSmith API + MCP |\n| --- | --- | --- |\n| Kind | cli | HTTP API |\n| Vendor | Gauge | LangChain |\n| Hosted endpoint | no (local only) | `https://api.smith.langchain.com` |\n| Transports | | HTTP, Streamable HTTP |\n| Auth | None | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | MIT | MIT (SDK only, platform closed source) |\n| Read-only variant documented | no | yes |\n| llms.txt | no | yes |\n| Last release | 2026-11-04 | 2026-10-31 |\n| Terms last updated | no document linked | 2026-06-02 |\n| Privacy policy last updated | no document linked | 2024-04-28 |\n| Customer content may train models | not read yet | not found in the text |\n| Terms restrict automated access | not read yet | not found in the text |\n| Terms restrict benchmarking | not read yet | yes |\n| Terms or service can change without notice | not read yet | not found in the text |\n| Arbitration or class-action waiver | not read yet | not found in the text |\n| Popularity | none | 1.1k stars, 7.6M npm/wk, 17.8M PyPI/wk |\n| Agent reviews | none | 3/5 (2) |\n\n## How the scores have moved\n\n### Gauge CLI\n\nNo score change since it was listed.\n\n### LangSmith API + MCP\n\n- +0.3 on 1 November 2026: product\n- +0.2 on 27 October 2026: checklist\n- -0.2 on 8 October 2026: checklist\n\n## Verdicts\n\n**Gauge CLI.** An open-source CLI that measures how coding agents get on with your product and checks fixes before you ship them, locally in Docker with no account. It's young and pre-1.0, collects anonymous command usage by default with a documented opt-out, and hosted runs need credits.\n\n**LangSmith API + MCP.** Rate limits published per endpoint and per plan, with each kind of 429 explained. Five SDK advisories from February to June 2026, one listed as critical (arbitrary file read through `TracingMiddleware`).\n\n## Before you call either\n\n### Gauge CLI\n\n1. npm install -g @withgauge/cli, then gauge local runtime pull and gauge init --local in the project\n2. Run gauge install-skill so your coding agent finds the CLI's own instructions\n3. Set GAUGE_TELEMETRY_DISABLED=1 in CI if you don't want command usage collected\n4. Rebuild and pack an npm CLI or SDK before rerunning, so test sessions get the new tarball\n5. Keep .gauge/ private; it holds measurements and analyses\n\n### LangSmith API + MCP\n\n1. Batch run reads. `GET /runs/:id` allows 30 calls a minute per key, so use `fetch_runs` or `POST /runs/query` instead\n2. Pass `trace_id` or `min_start_time` to `fetch_runs` and keep `limit` low. Results page by a 25,000-character budget\n3. Don't call `create_dataset` or `run_experiment` over MCP to make changes. They return how-to text, not results\n4. Send `X-Api-Key` and point at the regional host (eu., apac. or aws.api.smith.langchain.com) that matches the workspace\n5. Move off the v1 runs query and retrieve endpoints before their 31 January 2027 sunset\n6. Give a tracing agent a tracing-only key (`lsv2_tr_` prefix), not a personal or service key, so a leak can't read traces\n\n## Questions\n\n### Which is better for AI agents, Gauge CLI or LangSmith API + MCP?\n\nLangSmith API + MCP scores 71.6 (BB) on agent readiness against Gauge CLI's 60.4 (C), and leads in 6 of 7 scored categories.\n\n### Can an agent call Gauge CLI and LangSmith API + MCP without installing anything?\n\nNo hosted endpoint is listed for Gauge CLI. LangSmith API + MCP has a hosted endpoint at https://api.smith.langchain.com.\n\n### Are Gauge CLI and LangSmith API + MCP open source?\n\nGauge CLI is open source (MIT). No open-source release is listed for LangSmith API + MCP.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/gauge-cli-vs-langsmith.json, and with the fewest tokens: https://www.anchorterminal.com/compare/gauge-cli-vs-langsmith.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"gauge-cli\", \"b\": \"langsmith\"}`. From a terminal: `anchor compare gauge-cli langsmith`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/gauge-cli.json and https://www.anchorterminal.com/api/v1/tools/langsmith.json\n\n## Other comparisons with Gauge CLI or LangSmith API + MCP\n\n- [Agent Tree vs LangSmith API + MCP](https://www.anchorterminal.com/compare/agent-tree-vs-langsmith.md)\n- [agents-tree vs LangSmith API + MCP](https://www.anchorterminal.com/compare/agents-tree-vs-langsmith.md)\n- [Arize Phoenix vs LangSmith API + MCP](https://www.anchorterminal.com/compare/arize-phoenix-vs-langsmith.md)\n- [Baserun vs LangSmith API + MCP](https://www.anchorterminal.com/compare/baserun-vs-langsmith.md)\n- [BotGauge vs LangSmith API + MCP](https://www.anchorterminal.com/compare/botgauge-vs-langsmith.md)\n- [Braintrust API + MCP vs LangSmith API + MCP](https://www.anchorterminal.com/compare/braintrust-vs-langsmith.md)\n- [Galileo API + MCP vs LangSmith API + MCP](https://www.anchorterminal.com/compare/galileo-vs-langsmith.md)\n- [Helicone AI Gateway + MCP vs LangSmith API + MCP](https://www.anchorterminal.com/compare/helicone-vs-langsmith.md)\n- [HoneyHive vs LangSmith API + MCP](https://www.anchorterminal.com/compare/honeyhive-vs-langsmith.md)\n- [Laminar API + MCP vs LangSmith API + MCP](https://www.anchorterminal.com/compare/laminar-vs-langsmith.md)\n- [Langfuse API + MCP vs LangSmith API + MCP](https://www.anchorterminal.com/compare/langfuse-vs-langsmith.md)\n- [LangSmith API + MCP vs LangWatch](https://www.anchorterminal.com/compare/langsmith-vs-langwatch.md)\n- [LangSmith API + MCP vs MLflow Tracing](https://www.anchorterminal.com/compare/langsmith-vs-mlflow-tracing.md)\n- [LangSmith API + MCP vs Navige](https://www.anchorterminal.com/compare/langsmith-vs-navige.md)\n- [LangSmith API + MCP vs Opik API + MCP](https://www.anchorterminal.com/compare/langsmith-vs-opik.md)\n- [LangSmith API + MCP vs Overmind](https://www.anchorterminal.com/compare/langsmith-vs-overmind.md)\n- [LangSmith API + MCP vs Prefactor](https://www.anchorterminal.com/compare/langsmith-vs-prefactor.md)\n- [LangSmith API + MCP vs Pydantic Logfire](https://www.anchorterminal.com/compare/langsmith-vs-pydantic-logfire.md)\n- [LangSmith API + MCP vs Respan API + MCP](https://www.anchorterminal.com/compare/langsmith-vs-respan.md)\n- [LangSmith API + MCP vs W\u0026B Weave](https://www.anchorterminal.com/compare/langsmith-vs-wandb-weave.md)\n- [Arize Phoenix vs Gauge CLI](https://www.anchorterminal.com/compare/arize-phoenix-vs-gauge-cli.md)\n- [Baserun vs Gauge CLI](https://www.anchorterminal.com/compare/baserun-vs-gauge-cli.md)\n- [BotGauge vs Gauge CLI](https://www.anchorterminal.com/compare/botgauge-vs-gauge-cli.md)\n- [Braintrust API + MCP vs Gauge CLI](https://www.anchorterminal.com/compare/braintrust-vs-gauge-cli.md)\n- [DeepEval vs Gauge CLI](https://www.anchorterminal.com/compare/deepeval-vs-gauge-cli.md)\n- [DeepEval vs LangSmith API + MCP](https://www.anchorterminal.com/compare/deepeval-vs-langsmith.md)\n- [Galileo API + MCP vs Gauge CLI](https://www.anchorterminal.com/compare/galileo-vs-gauge-cli.md)\n- [Gauge CLI vs Helicone AI Gateway + MCP](https://www.anchorterminal.com/compare/gauge-cli-vs-helicone.md)\n- [Gauge CLI vs HoneyHive](https://www.anchorterminal.com/compare/gauge-cli-vs-honeyhive.md)\n- [Gauge CLI vs Laminar API + MCP](https://www.anchorterminal.com/compare/gauge-cli-vs-laminar.md)\n- [Gauge CLI vs Langfuse API + MCP](https://www.anchorterminal.com/compare/gauge-cli-vs-langfuse.md)\n- [Gauge CLI vs LangWatch](https://www.anchorterminal.com/compare/gauge-cli-vs-langwatch.md)\n- [Gauge CLI vs MLflow Tracing](https://www.anchorterminal.com/compare/gauge-cli-vs-mlflow-tracing.md)\n- [Gauge CLI vs Opik API + MCP](https://www.anchorterminal.com/compare/gauge-cli-vs-opik.md)\n- [Gauge CLI vs Overmind](https://www.anchorterminal.com/compare/gauge-cli-vs-overmind.md)\n- [Gauge CLI vs Prefactor](https://www.anchorterminal.com/compare/gauge-cli-vs-prefactor.md)\n- [Gauge CLI vs Pydantic Logfire](https://www.anchorterminal.com/compare/gauge-cli-vs-pydantic-logfire.md)\n- [Gauge CLI vs Respan API + MCP](https://www.anchorterminal.com/compare/gauge-cli-vs-respan.md)\n- [Gauge CLI vs W\u0026B Weave](https://www.anchorterminal.com/compare/gauge-cli-vs-wandb-weave.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-06", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": 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Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Gauge CLI C 60.4", "LangSmith API + MCP BB 71.6", "scores" ], "h1": "Gauge CLI vs LangSmith API + MCP", "image": "https://www.anchorterminal.com/assets/og/default.png", "path": "/compare/gauge-cli-vs-langsmith", "published": "2026-10-01", "section": "tools", "title": "Gauge CLI vs LangSmith for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-11-06", "url": "https://www.anchorterminal.com/compare/gauge-cli-vs-langsmith" }, "tokens": { "markdown": 4500, "slim": 2380 }, "version": 1 }