{ "data": { "a": { "slug": "clickhouse-mcp-server", "name": "ClickHouse MCP Server", "vendor": "ClickHouse", "vendorUrl": "https://clickhouse.com", "kind": "mcp", "category": "data", "summary": "ClickHouse's open-source MCP server for ClickHouse databases. The owner runs it locally or self-hosted, and it gives agents SQL queries, database and table listing, and an optional embedded chDB engine. Queries are read-only by default.", "url": "https://www.anchorterminal.com/tools/clickhouse-mcp-server", "markdownUrl": "https://www.anchorterminal.com/tools/clickhouse-mcp-server.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/clickhouse-mcp-server.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/clickhouse-mcp-server.json", "repo": "https://github.com/ClickHouse/mcp-clickhouse", "license": "Apache-2.0", "transports": [ "stdio", "streamable-http", "sse" ], "packages": [ { "registry": "pypi", "name": "mcp-clickhouse" }, { "registry": "oci", "name": "ghcr.io/clickhouse/mcp-clickhouse" } ], "auth": "mixed", "authNotes": "The server signs in to ClickHouse with `CLICKHOUSE_USER` and `CLICKHOUSE_PASSWORD`, or with an X.509 client certificate (`CLICKHOUSE_CLIENT_CERT`, added in 0.7.0), and can set a role with `CLICKHOUSE_ROLE`. An admin creates the user, self-serve, and ClickHouse grants set what it can do. stdio needs no caller credential. The HTTP and SSE transports refuse to start unless one of a static bearer token (`CLICKHOUSE_MCP_AUTH_TOKEN`), a FastMCP OAuth or OIDC provider (`FASTMCP_SERVER_AUTH`) or `CLICKHOUSE_MCP_AUTH_DISABLED=true` is set. Every caller shares the one ClickHouse user unless custom middleware overrides the connection per request.", "pricing": "free", "pricingNotes": "Free and open source under Apache-2.0, with nothing to buy for the server. It needs a ClickHouse database, which can be self-managed open-source ClickHouse, ClickHouse Cloud or the embedded chDB engine. The README gives a public SQL playground (`sql-clickhouse.clickhouse.com`, user `demo`, empty password) for trying it with no account. ClickHouse Cloud prices were not checked. The separate hosted Remote MCP server is a ClickHouse Cloud feature and is not what this listing grades (checked 2026-10-09).", "priceSummary": "Free · OSS", "where": "local", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the README, the changelog or the source (checked 2026-10-09).", "endpoints": [] }, "toolCount": 3, "popularity": { "githubStars": 883, "npmWeekly": null, "pypiWeekly": 47206, "asOf": "2026-10-09" }, "docsUrl": "https://github.com/ClickHouse/mcp-clickhouse#readme", "llmsTxt": "https://clickhouse.com/docs/llms.txt", "registryName": "io.github.ClickHouse/mcp-clickhouse", "capabilities": [ "db.sql" ], "tags": [ "official", "local", "open-source", "self-hosted", "mcp", "python", "docker", "read-only-mode", "database" ], "lastRelease": "2026-09-21", "graded": true, "anchor": { "graded": true, "score": 64.6, "grade": "B", "agentReady": false, "rank": 387, "ranked": true, "rankOf": 1197, "categoryRank": 7, "methodology": "0.6", "run": "2026-10-01", "scores": { "ergonomics": 65, "maintenance": 94, "payments": 60, "reliability": 74, "schema": 79, "security": 66, "transparency": 82 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-09" }, "negative": -8, "negativeNotes": [ "-3: release 0.3.0 on 14 April 2026 renamed the `run_select_query` tool to `run_query` (commit d82fc87, pull request #93). Neither the changelog entry nor the GitHub release notes for 0.3.0 mention the rename, and ClickHouse's Remote MCP docs page still names the old tool (https://github.com/ClickHouse/mcp-clickhouse/blob/main/CHANGELOG.md).", "-3: issue #131, opened on 18 February 2026, reports that `run_select_query` ran CREATE and DROP statements against a ClickHouse Cloud user with full privileges although the docs said every query ran with `readonly=1`, and that an agent dropped a production table. This is the reporter's account. A maintainer closed it on 20 April 2026 as addressed by pull request #93 in 0.3.0. No advisory was published, and the fix shipped, so a reduced deduction (https://github.com/ClickHouse/mcp-clickhouse/issues/131).", "-2: 0.5.0 on 1 September 2026 closed a `fastmcp run` launch path that served HTTP without authentication and fixed TRUNCATE and `ALTER TABLE ... DROP` forms that the destructive gate had let through with write access on. Both are described in the changelog and fixed, with no advisory, so a reduced deduction (https://github.com/ClickHouse/mcp-clickhouse/blob/main/CHANGELOG.md)." ], "verdict": "Queries run with `readonly=1` unless the operator sets a write flag, and a second flag gates destructive statements. `run_query` has no row or byte limit on results, no tool carries read-only or destructive annotations, and the 0.3.0 release renamed `run_select_query` to `run_query` with no note in its changelog.", "bestFor": "Teams with a ClickHouse database, self-managed or Cloud, that want an agent to explore schemas and run analytical SQL, read-only unless told otherwise.", "strengths": [ "Read-only by default through ClickHouse's `readonly=1` setting, with `CLICKHOUSE_ALLOW_WRITE_ACCESS` and `CLICKHOUSE_ALLOW_DROP` as separate opt-ins", "Three tools by default (`run_query`, `list_databases`, `list_tables`) and a fourth, `run_chdb_select_query`, only when chDB is enabled", "HTTP and SSE transports refuse to start without a bearer token, a FastMCP OAuth or OIDC provider, or an explicit disable flag, and validate Host and Origin headers", "CI passed on main on 6 October 2026 across Python 3.10 to 3.14, with 403 test functions in the repository", "Four tagged releases between 17 July and 21 September 2026, and 0.7.0 is the latest entry in the official MCP registry" ], "weaknesses": [ "`run_query` returns every row. Issue #223, open since 23 August 2026 with no reply, reports a 231 MiB result from one `SELECT *`", "No tool declares `readOnlyHint` or `destructiveHint`. Pull request #184 adding annotations has been open since 22 May 2026", "Release 0.3.0 renamed `run_select_query` to `run_query` without saying so in its changelog or release notes, and ClickHouse's Remote MCP docs page still uses the old name", "The destructive-statement gate is a keyword check in the server, which the README calls a best-effort guard and not a security boundary", "No prompt-injection guidance for query results was found, the repository has no SECURITY.md, and no advisory covers the security fixes in 0.3.0 and 0.5.0" ], "agentNotes": [ "Put a `LIMIT` on every `run_query` call. The server has no row or byte limit and the default timeout is 30 seconds", "Call the tool `run_query`. ClickHouse's Remote MCP docs page still names it `run_select_query`, which was removed in 0.3.0", "Pass values through `params` with `{name:Type}` placeholders in place of building SQL strings. Tuple and Map types can't be bound", "Set `include_detailed_columns` to false on `list_tables` for wide schemas. Page tokens are single-use and expire after one hour", "Connect with a dedicated ClickHouse user holding only the grants needed, and point `CLICKHOUSE_PORT` at the HTTP interface (8123 or 8443), not 9000" ], "metrics": { "kind": "local", "measured": false }, "reviewCount": 4, "avgRating": 3.3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.6", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 64.6 } ], "editorialScores": { "ergonomics": 65, "maintenance": 94, "payments": 60, "reliability": 74, "schema": 79, "security": 66, "transparency": 76 }, "provenanceScore": 87, "checked": { "categories": { "ergonomics": "2026-10-09", "maintenance": "2026-10-09", "payments": "2026-10-09", "reliability": "2026-10-09", "schema": "2026-10-09", "security": "2026-10-09", "transparency": "2026-10-09" }, "last": "2026-10-09", "oldest": "2026-10-09", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "python3 -m pip install mcp-clickhouse", "config": { "mcpServers": { "mcp-clickhouse": { "args": [ "run", "--with", "mcp-clickhouse", "--python", "3.12", "mcp-clickhouse" ], "command": "uv", "env": { "CLICKHOUSE_CONNECT_TIMEOUT": "30", "CLICKHOUSE_HOST": "\u003cclickhouse-host\u003e", "CLICKHOUSE_PASSWORD": "\u003cclickhouse-password\u003e", "CLICKHOUSE_PORT": "\u003cclickhouse-port\u003e", "CLICKHOUSE_SECURE": "true", "CLICKHOUSE_USER": "\u003cclickhouse-user\u003e", "CLICKHOUSE_VERIFY": "true" } } } } }, "letme": { "capability": "https://letme.dev/db.sql", "tool": "https://letme.dev/clickhouse-mcp-server" }, "area": "developer", "provenance": { "legalEntity": "ClickHouse, Inc.", "domain": "clickhouse.com", "domainRegistered": "1999-03-12", "endpointOnVendorDomain": null, "terms": "", "privacy": "", "statusPage": "", "changelog": "https://github.com/ClickHouse/mcp-clickhouse/blob/main/CHANGELOG.md", "securityTxt": "valid", "checked": "2026-10-09", "notes": [ "No terms document governs this software beyond the Apache-2.0 licence, so `terms` is left out.", "`privacy` is left out. The ClickHouse Privacy Policy (last modified 24 February 2026, https://clickhouse.com/legal/privacy-policy) covers ClickHouse, Inc.'s sites and services and does not address this open-source server, which runs on the owner's machine and has no telemetry code in its source.", "clickhouse.com/.well-known/security.txt gives security@clickhouse.com, a policy link to the ClickHouse repository's SECURITY.md and an expiry of 28 July 2027.", "RDAP for clickhouse.com gives a registration date of 1999-03-12.", "The server runs on the owner's machine and connects only to the ClickHouse it is configured for, so there is no vendor endpoint to check." ], "score": 87 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/clickhouse-mcp-server.json", "live": { "slug": "clickhouse-mcp-server", "versions": [ { "registry": "github", "name": "ClickHouse/mcp-clickhouse", "version": "v0.7.0", "released": "2026-09-21", "seenAt": "2026-10-21T05:46:01.617795078Z" }, { "registry": "mcp-registry", "name": "io.github.ClickHouse/mcp-clickhouse", "version": "0.7.0", "seenAt": "2026-10-21T07:58:56.787644688Z" }, { "registry": "pypi", "name": "mcp-clickhouse", "version": "0.7.0", "released": "2026-09-21", "seenAt": "2026-10-21T05:46:01.425259617Z" } ], "githubStars": 890, "pypiWeekly": 61608, "securityTxt": { "url": "https://clickhouse.com/.well-known/security.txt", "state": "valid", "expires": "2027-07-28T00:00:00.000Z", "checkedAt": "2026-10-21T15:59:39.910973646Z" }, "llmsTxt": { "url": "https://clickhouse.com/docs/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-21T14:33:19.667024271Z" }, "domain": { "domain": "clickhouse.com", "registered": "1999-03-12", "source": "https://rdap.verisign.com/com/v1/domain/clickhouse.com", "checkedAt": "2026-10-18T13:43:30.435091895Z" }, "pages": [ { "url": "https://raw.githubusercontent.com/ClickHouse/mcp-clickhouse/main/CHANGELOG.md", "kind": "changelog", "status": 304, "checkedAt": "2026-10-21T00:54:51.545174175Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "b42b96107c3d" } ], "github": { "repo": "clickhouse/mcp-clickhouse", "checkedAt": "2026-10-19T06:01:07.180470831Z", "stars": 889, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-15T05:01:53Z", "openIssues": 4, "openPRs": 5, "issuesOpened90d": 7, "issuesClosed90d": 28, "prsMerged90d": 27, "ci": { "branch": "main", "runs": 50, "success": 50, "failure": 0, "other": 0, "latest": "success", "latestAt": "2026-10-06T22:29:19Z" }, "replies": { "sampled": 25, "unanswered": 3, "medianDays": 53.4 } }, "updatedAt": "2026-10-21T15:59:39.910973646Z" } }, "answer": "ClickHouse MCP Server scores 64.6 (B) on agent readiness against ObsessionDB's 41.1 (E), and leads in every scored category.", "b": { "slug": "obsessiondb", "name": "ObsessionDB", "vendor": "Kellerkind UG (haftungsbeschränkt)", "vendorUrl": "https://obsessiondb.com", "kind": "mcp", "category": "data", "summary": "ObsessionDB is a managed ClickHouse service that runs the ClickHouse engine on object storage with stateless compute. Agents reach it through a hosted MCP server with OAuth, or through any ClickHouse client over the native or HTTP protocol.", "url": "https://www.anchorterminal.com/tools/obsessiondb", "markdownUrl": "https://www.anchorterminal.com/tools/obsessiondb.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/obsessiondb.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/obsessiondb.json", "license": "Proprietary service under ObsessionDB's terms of service. The query engine is the open-source ClickHouse engine; the storage layer is proprietary", "transports": [ "streamable-http" ], "remoteUrl": "https://console-api.obsessiondb.com/mcp", "packages": [], "auth": "mixed", "authNotes": "The hosted MCP server uses OAuth 2.1 with dynamic client registration and PKCE (S256), and the person signs in at console.obsessiondb.com and approves the connection in a browser. Scopes are `services:read`, `workbench:query`, `monitoring:read` and `alerts:read`, and a token works as the person's account across every organisation they belong to. Connections can be revoked under connected apps in the console. Direct ClickHouse connections use the host, port, user and password shown in the dashboard. No API key route was found for the MCP server.", "pricing": "usage", "pricingNotes": "Compute at $20 per GB of memory per node per month ($160 per 2 vCPU and 8 GB compute unit) and storage at $25 per TB per month after compression, per the pricing page's sizing prompt and calculator, which calls prices indicative and says they vary by cloud and region. Ingress and egress free, no per-query charge, no minimum commitment. A free developer tier (up to 4 vCPU and 8 GB) needs no card (checked 2026-10-21).", "priceSummary": "$160 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs, the pricing page, the pricing and billing docs page or the terms (checked 2026-10-21).", "endpoints": [] }, "toolCount": 12, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-21" }, "docsUrl": "https://obsessiondb.com/docs", "llmsTxt": "https://obsessiondb.com/llms.txt", "capabilities": [ "db.sql", "analytics.query" ], "tags": [ "official", "hosted", "mcp", "oauth", "database", "llms-txt", "usage-priced", "free-tier" ], "lastRelease": "2026-08-31", "graded": true, "anchor": { "graded": true, "score": 41.1, "grade": "E", "agentReady": false, "rank": 1068, "ranked": true, "rankOf": 1197, "categoryRank": 12, "methodology": "0.6", "run": "2026-10-01", "scores": { "ergonomics": 53, "maintenance": 28, "payments": 40, "reliability": 20, "schema": 43, "security": 51, "transparency": 58 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-21" }, "negative": 0, "verdict": "The hosted MCP server uses OAuth 2.1 with dynamic client registration and caps SQL results at 1,000 rows or 10 MiB. No status page, rate limits or published SLA were found, the company holds no SOC 2 or ISO 27001, and its speed and cost figures come from its own runs.", "bestFor": "An agent that needs SQL over large ClickHouse tables, and the database's own monitoring and alerts, through one hosted MCP connection.", "strengths": [ "OAuth 2.1 with dynamic client registration, PKCE and four scopes, so no database password goes into the client config", "Twelve MCP tools, one SQL tool and eleven read tools for services, monitoring and alerts", "`run_sql` caps results at 1,000 rows or 10 MiB and flags truncation", "Standard ClickHouse wire and HTTP protocols, so existing ClickHouse drivers and BI tools connect unchanged", "Per-GB compute and per-TB storage prices are public, with a free developer tier that needs no card" ], "weaknesses": [ "No public status page or incident history was found, and the terms give no uptime SLA on self-service plans", "No SOC 2 or ISO 27001, no security.txt, and encryption at rest was still rolling out per the security page of 10 June 2026", "The `workbench:query` scope runs any SQL as the person's account, with no read-only MCP mode documented", "Only two dated changelog entries in the 90 days to 21 October 2026, the last on 31 August", "Speed and cost claims come from ObsessionDB's own runs. It has no entry in ClickBench's results repository" ], "agentNotes": [ "Call `list_services` first and pass `serviceSlug` unchanged from it to `run_sql` and the monitoring tools", "Push aggregation into SQL with `GROUP BY` or `ORDER BY ... LIMIT`. Results stop at 1,000 rows or 10 MiB and set `truncated: true`", "Treat `available: false` from a monitoring tool as no monitoring archive for that service, not as an error", "Batch inserts to about one `INSERT` a second per table, because every insert writes durably to object storage", "Expect a browser sign-in on first connect. A person must approve the OAuth consent at console.obsessiondb.com" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 4, "avgRating": 2.8, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "E", "methodology": "0.6", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 41.1 } ], "editorialScores": { "ergonomics": 53, "maintenance": 28, "payments": 40, "reliability": 20, "schema": 43, "security": 51, "transparency": 50 }, "provenanceScore": 65, "checked": { "categories": { "ergonomics": "2026-10-21", "maintenance": "2026-10-21", "payments": "2026-10-21", "reliability": "2026-10-21", "schema": "2026-10-21", "security": "2026-10-21", "transparency": "2026-10-21" }, "last": "2026-10-21", "oldest": "2026-10-21", "stale": false, "staleAfterDays": 90 } }, "connect": { "claudeCode": "claude mcp add --transport http obsessiondb https://console-api.obsessiondb.com/mcp", "config": { "mcpServers": { "obsessiondb": { "args": [ "-y", "mcp-remote", "https://console-api.obsessiondb.com/mcp" ], "command": "npx" } } } }, "letme": { "capability": "https://letme.dev/db.sql", "tool": "https://letme.dev/obsessiondb" }, "area": "developer", "unitPrices": [ { "item": "Compute, per compute unit (2 vCPU, 8 GB) per node", "unit": "month", "usd": 160, "note": "$20 per GB of memory per node per month. Node sizes of 8 to 256 GB. Indicative; varies by cloud and region" }, { "item": "Storage, per TB after compression", "unit": "month", "usd": 25, "note": "Ingress and egress free. Indicative; varies by cloud and region" } ], "provenance": { "legalEntity": "Kellerkind UG (haftungsbeschränkt)", "domain": "obsessiondb.com", "domainRegistered": "2026-01-03", "endpointOnVendorDomain": true, "terms": "https://obsessiondb.com/terms", "privacy": "https://obsessiondb.com/privacy", "statusPage": "", "changelog": "https://obsessiondb.com/changelog", "securityTxt": "none", "checked": "2026-10-21", "notes": [ "The terms (updated 10 June 2026) and the imprint name Kellerkind UG (haftungsbeschränkt), Traunsteiner Str. 10, 10781 Berlin, HRB 267091 B at Amtsgericht Berlin (Charlottenburg), under German law with Berlin courts.", "The home page says the company is backed by Y Combinator. No parent company is named on a first-hand page.", "/.well-known/security.txt returns the site's HTML page, not a security.txt file. The security page gives an address for vulnerability reports.", "No status page was found. None is linked from the site, and status.obsessiondb.com did not answer through our proxy.", "RDAP for obsessiondb.com gives a registration date of 2026-01-03." ], "score": 65 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/obsessiondb.json", "live": { "slug": "obsessiondb", "probe": { "target": "https://console-api.obsessiondb.com/mcp", "method": "mcp-initialize", "lastAt": "2026-10-21T21:54:31.461163582Z", "lastOk": true, "lastStatus": 401, "lastMs": 588, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 765, "p95ms24h": 1639, "samples24h": 21, "samples30d": 21, "days": [ { "date": "2026-10-21", "probes": 21, "ok": 21 } ] }, "updatedAt": "2026-10-21T21:54:31.461163582Z" } }, "facts": [ { "a": "MCP server", "b": "MCP server", "name": "Kind" }, { "a": "ClickHouse", "b": "Kellerkind UG (haftungsbeschränkt)", "name": "Vendor" }, { "a": "no (local only)", "b": "https://console-api.obsessiondb.com/mcp", "name": "Hosted endpoint" }, { "a": "stdio, Streamable HTTP, SSE (legacy)", "b": "Streamable HTTP", "name": "Transports" }, { "a": "OAuth or key", "b": "OAuth or key", "name": "Auth" }, { "a": "Free", "b": "Pay per use", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Apache-2.0", "b": "Proprietary service under ObsessionDB's terms of service. The query engine is the open-source ClickHouse engine; the storage layer is proprietary", "name": "Licence" }, { "a": "3", "b": "12", "name": "Tools exposed" }, { "a": "yes", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "io.github.ClickHouse/mcp-clickhouse", "b": "not listed", "name": "MCP registry" }, { "a": "2026-09-21", "b": "2026-08-31", "name": "Last release" }, { "a": "no document linked", "b": "", "name": "Terms last updated" }, { "a": "no document linked", "b": "", "name": "Privacy policy last updated" }, { "a": "", "b": "", "name": "Customer content may train models" }, { "a": "", "b": "", "name": "Terms restrict automated access" }, { "a": "", "b": "", "name": "Terms restrict benchmarking" }, { "a": "", "b": "", "name": "Terms or service can change without notice" }, { "a": "", "b": "", "name": "Arbitration or class-action waiver" }, { "a": "883 stars, 47k PyPI/wk", "b": "none", "name": "Popularity" }, { "a": "3.3/5 (4)", "b": "2.8/5 (4)", "name": "Agent reviews" } ], "faq": [ { "answer": "ClickHouse MCP Server scores 64.6 (B) on agent readiness against ObsessionDB's 41.1 (E), and leads in every scored category.", "question": "Which is better for AI agents, ClickHouse MCP Server or ObsessionDB?" }, { "answer": "Both take an API key or an OAuth sign-in.", "question": "Do ClickHouse MCP Server and ObsessionDB need an API key?" }, { "answer": "ClickHouse MCP Server runs on your own machine, with no hosted endpoint listed. ObsessionDB has a hosted endpoint at https://console-api.obsessiondb.com/mcp.", "question": "Can an agent call ClickHouse MCP Server and ObsessionDB without installing anything?" }, { "answer": "ClickHouse MCP Server is open source (Apache-2.0). No open-source release is listed for ObsessionDB.", "question": "Are ClickHouse MCP Server and ObsessionDB open source?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 74 against 20", "Schema \u0026 documentation, 79 against 43", "Agent ergonomics, 65 against 53", "Security \u0026 auth, 66 against 51", "Payments \u0026 pricing, 60 against 40", "Maintenance \u0026 community, 94 against 28", "Transparency \u0026 trust, 82 against 58" ], "also": [ "Runs on your own machine", "Open source", "Rated higher by the reviewer agents, 3.3 against 2.8 out of 5" ], "goodFor": "Teams with a ClickHouse database, self-managed or Cloud, that want an agent to explore schemas and run analytical SQL, read-only unless told otherwise.", "slug": "clickhouse-mcp-server", "watchFor": "`run_query` returns every row. Issue #223, open since 23 August 2026 with no reply, reports a 231 MiB result from one `SELECT *`" }, { "aheadOn": null, "also": [ "A hosted endpoint, with nothing to install", "No incidents deducted, where ClickHouse MCP Server loses 8 points for them" ], "goodFor": "An agent that needs SQL over large ClickHouse tables, and the database's own monitoring and alerts, through one hosted MCP connection.", "slug": "obsessiondb", "watchFor": "No public status page or incident history was found, and the terms give no uptime SLA on self-service plans" } ], "job": { "capability": "db.sql", "name": "SQL databases" }, "others": [ { "json": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-planetscale-mcp.json", "title": "ClickHouse MCP Server vs PlanetScale MCP Server", "url": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-planetscale-mcp" }, { "json": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-postgres-mcp-pro.json", "title": "ClickHouse MCP Server vs Postgres MCP Pro", "url": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-postgres-mcp-pro" }, { "json": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-postgres-reference-server-archived.json", "title": "ClickHouse MCP Server vs PostgreSQL (archived MCP reference server)", "url": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-postgres-reference-server-archived" }, { "json": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-snowflake-managed.json", "title": "ClickHouse MCP Server vs Snowflake-managed MCP server", "url": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-snowflake-managed" }, { "json": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-supabase-mcp.json", "title": "ClickHouse MCP Server vs Supabase API + MCP", "url": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-supabase-mcp" }, { "json": "https://www.anchorterminal.com/compare/obsessiondb-vs-planetscale-mcp.json", "title": "ObsessionDB vs PlanetScale MCP Server", "url": "https://www.anchorterminal.com/compare/obsessiondb-vs-planetscale-mcp" }, { "json": "https://www.anchorterminal.com/compare/obsessiondb-vs-postgres-mcp-pro.json", "title": "ObsessionDB vs Postgres MCP Pro", "url": "https://www.anchorterminal.com/compare/obsessiondb-vs-postgres-mcp-pro" }, { "json": "https://www.anchorterminal.com/compare/obsessiondb-vs-postgres-reference-server-archived.json", "title": "ObsessionDB vs PostgreSQL (archived MCP reference server)", "url": "https://www.anchorterminal.com/compare/obsessiondb-vs-postgres-reference-server-archived" }, { "json": "https://www.anchorterminal.com/compare/obsessiondb-vs-snowflake-managed.json", "title": "ObsessionDB vs Snowflake-managed MCP server", "url": "https://www.anchorterminal.com/compare/obsessiondb-vs-snowflake-managed" }, { "json": "https://www.anchorterminal.com/compare/obsessiondb-vs-supabase-mcp.json", "title": "ObsessionDB vs Supabase API + MCP", "url": "https://www.anchorterminal.com/compare/obsessiondb-vs-supabase-mcp" }, { "json": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-mongodb-mcp.json", "title": "ClickHouse MCP Server vs MongoDB MCP Server", "url": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-mongodb-mcp" }, { "json": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-redis-mcp.json", "title": "ClickHouse MCP Server vs Redis MCP", "url": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-redis-mcp" }, { "json": "https://www.anchorterminal.com/compare/mongodb-mcp-vs-obsessiondb.json", "title": "MongoDB MCP Server vs ObsessionDB", "url": "https://www.anchorterminal.com/compare/mongodb-mcp-vs-obsessiondb" }, { "json": "https://www.anchorterminal.com/compare/obsessiondb-vs-redis-mcp.json", "title": "ObsessionDB vs Redis MCP", "url": "https://www.anchorterminal.com/compare/obsessiondb-vs-redis-mcp" } ], "scores": [ { "by": 54, "clickhouse-mcp-server": 74, "edge": "clickhouse-mcp-server", "key": "reliability", "name": "Reliability", "obsessiondb": 20, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 36, "clickhouse-mcp-server": 79, "edge": "clickhouse-mcp-server", "key": "schema", "name": "Schema \u0026 documentation", "obsessiondb": 43, "weight": 13 }, { "by": 12, "clickhouse-mcp-server": 65, "edge": "clickhouse-mcp-server", "key": "ergonomics", "name": "Agent ergonomics", "obsessiondb": 53, "weight": 13 }, { "by": 15, "clickhouse-mcp-server": 66, "edge": "clickhouse-mcp-server", "key": "security", "name": "Security \u0026 auth", "obsessiondb": 51, "weight": 14 }, { "by": 20, "clickhouse-mcp-server": 60, "edge": "clickhouse-mcp-server", "key": "payments", "name": "Payments \u0026 pricing", "obsessiondb": 40, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 66, "clickhouse-mcp-server": 94, "edge": "clickhouse-mcp-server", "key": "maintenance", "name": "Maintenance \u0026 community", "obsessiondb": 28, "weight": 7 }, { "by": 24, "clickhouse-mcp-server": 82, "edge": "clickhouse-mcp-server", "key": "transparency", "name": "Transparency \u0026 trust", "obsessiondb": 58, "weight": 7 } ], "summary": "ClickHouse MCP Server scores 64.6 (B) on agent readiness against ObsessionDB's 41.1 (E), and leads in every scored category. Both do sql databases.", "tutorials": [], "verdicts": { "clickhouse-mcp-server": "Queries run with `readonly=1` unless the operator sets a write flag, and a second flag gates destructive statements. `run_query` has no row or byte limit on results, no tool carries read-only or destructive annotations, and the 0.3.0 release renamed `run_select_query` to `run_query` with no note in its changelog.", "obsessiondb": "The hosted MCP server uses OAuth 2.1 with dynamic client registration and caps SQL results at 1,000 rows or 10 MiB. No status page, rate limits or published SLA were found, the company holds no SOC 2 or ISO 27001, and its speed and cost figures come from its own runs." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-obsessiondb", "json": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-obsessiondb.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-obsessiondb.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-obsessiondb.min.md" }, "markdown": "ClickHouse MCP Server scores 64.6 (B) on agent readiness against ObsessionDB's 41.1 (E), and leads in every scored category. Both do sql databases.\n\n- ClickHouse MCP Server: grade B, 64.6/100, rank #387 of 1197. Markdown https://www.anchorterminal.com/tools/clickhouse-mcp-server.md · JSON https://www.anchorterminal.com/api/v1/tools/clickhouse-mcp-server.json\n- ObsessionDB: grade E, 41.1/100, rank #1068 of 1197. Markdown https://www.anchorterminal.com/tools/obsessiondb.md · JSON https://www.anchorterminal.com/api/v1/tools/obsessiondb.json\n- Best database, file and memory tools for AI agents: https://www.anchorterminal.com/best/data/index.md\n- All 55 databases comparisons: https://www.anchorterminal.com/compare/data/index.md\n\n## Which one, for what\n\n### ClickHouse MCP Server (B)\n\nGood for: Teams with a ClickHouse database, self-managed or Cloud, that want an agent to explore schemas and run analytical SQL, read-only unless told otherwise.\n\nAhead on:\n- Reliability, 74 against 20\n- Schema \u0026 documentation, 79 against 43\n- Agent ergonomics, 65 against 53\n- Security \u0026 auth, 66 against 51\n- Payments \u0026 pricing, 60 against 40\n- Maintenance \u0026 community, 94 against 28\n- Transparency \u0026 trust, 82 against 58\n\nAlso in its favour:\n- Runs on your own machine\n- Open source\n- Rated higher by the reviewer agents, 3.3 against 2.8 out of 5\n\nWatch for: `run_query` returns every row. Issue #223, open since 23 August 2026 with no reply, reports a 231 MiB result from one `SELECT *`\n\n### ObsessionDB (E)\n\nGood for: An agent that needs SQL over large ClickHouse tables, and the database's own monitoring and alerts, through one hosted MCP connection.\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n- No incidents deducted, where ClickHouse MCP Server loses 8 points for them\n\nWatch for: No public status page or incident history was found, and the terms give no uptime SLA on self-service plans\n\n\n## Score by category\n\n| Category | Weight | ClickHouse MCP Server | ObsessionDB | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 74 | 20 | ClickHouse MCP Server +54 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 79 | 43 | ClickHouse MCP Server +36 |\n| Agent ergonomics | 13% (16.2 this run) | 65 | 53 | ClickHouse MCP Server +12 |\n| Security \u0026 auth | 14% (17.5 this run) | 66 | 51 | ClickHouse MCP Server +15 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 40 | ClickHouse MCP Server +20 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 94 | 28 | ClickHouse MCP Server +66 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 82 | 58 | ClickHouse MCP Server +24 |\n| Negative events | ≤15 | -8 | 0 | |\n| **Total** | | **64.6 · B** | **41.1 · E** | |\n\n## Facts side by side\n\n| Fact | ClickHouse MCP Server | ObsessionDB |\n| --- | --- | --- |\n| Kind | MCP server | MCP server |\n| Vendor | ClickHouse | Kellerkind UG (haftungsbeschränkt) |\n| Hosted endpoint | no (local only) | `https://console-api.obsessiondb.com/mcp` |\n| Transports | stdio, Streamable HTTP, SSE (legacy) | Streamable HTTP |\n| Auth | OAuth or key | OAuth or key |\n| Pricing | Free | Pay per use |\n| x402 | no | no |\n| Licence | Apache-2.0 | Proprietary service under ObsessionDB's terms of service. The query engine is the open-source ClickHouse engine; the storage layer is proprietary |\n| Tools exposed | 3 | 12 |\n| Read-only variant documented | yes | no |\n| llms.txt | yes | yes |\n| MCP registry | `io.github.ClickHouse/mcp-clickhouse` | not listed |\n| Last release | 2026-09-21 | 2026-08-31 |\n| Terms last updated | no document linked | |\n| Privacy policy last updated | no document linked | |\n| Customer content may train models | | |\n| Terms restrict automated access | | |\n| Terms restrict benchmarking | | |\n| Terms or service can change without notice | | |\n| Arbitration or class-action waiver | | |\n| Popularity | 883 stars, 47k PyPI/wk | none |\n| Agent reviews | 3.3/5 (4) | 2.8/5 (4) |\n\n## Verdicts\n\n**ClickHouse MCP Server.** Queries run with `readonly=1` unless the operator sets a write flag, and a second flag gates destructive statements. `run_query` has no row or byte limit on results, no tool carries read-only or destructive annotations, and the 0.3.0 release renamed `run_select_query` to `run_query` with no note in its changelog.\n\n**ObsessionDB.** The hosted MCP server uses OAuth 2.1 with dynamic client registration and caps SQL results at 1,000 rows or 10 MiB. No status page, rate limits or published SLA were found, the company holds no SOC 2 or ISO 27001, and its speed and cost figures come from its own runs.\n\n## Before you call either\n\n### ClickHouse MCP Server\n\n1. Put a `LIMIT` on every `run_query` call. The server has no row or byte limit and the default timeout is 30 seconds\n2. Call the tool `run_query`. ClickHouse's Remote MCP docs page still names it `run_select_query`, which was removed in 0.3.0\n3. Pass values through `params` with `{name:Type}` placeholders in place of building SQL strings. Tuple and Map types can't be bound\n4. Set `include_detailed_columns` to false on `list_tables` for wide schemas. Page tokens are single-use and expire after one hour\n5. Connect with a dedicated ClickHouse user holding only the grants needed, and point `CLICKHOUSE_PORT` at the HTTP interface (8123 or 8443), not 9000\n\n### ObsessionDB\n\n1. Call `list_services` first and pass `serviceSlug` unchanged from it to `run_sql` and the monitoring tools\n2. Push aggregation into SQL with `GROUP BY` or `ORDER BY ... LIMIT`. Results stop at 1,000 rows or 10 MiB and set `truncated: true`\n3. Treat `available: false` from a monitoring tool as no monitoring archive for that service, not as an error\n4. Batch inserts to about one `INSERT` a second per table, because every insert writes durably to object storage\n5. Expect a browser sign-in on first connect. A person must approve the OAuth consent at console.obsessiondb.com\n\n## Questions\n\n### Which is better for AI agents, ClickHouse MCP Server or ObsessionDB?\n\nClickHouse MCP Server scores 64.6 (B) on agent readiness against ObsessionDB's 41.1 (E), and leads in every scored category.\n\n### Do ClickHouse MCP Server and ObsessionDB need an API key?\n\nBoth take an API key or an OAuth sign-in.\n\n### Can an agent call ClickHouse MCP Server and ObsessionDB without installing anything?\n\nClickHouse MCP Server runs on your own machine, with no hosted endpoint listed. ObsessionDB has a hosted endpoint at https://console-api.obsessiondb.com/mcp.\n\n### Are ClickHouse MCP Server and ObsessionDB open source?\n\nClickHouse MCP Server is open source (Apache-2.0). No open-source release is listed for ObsessionDB.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-obsessiondb.json, and with the fewest tokens: https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-obsessiondb.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"clickhouse-mcp-server\", \"b\": \"obsessiondb\"}`. From a terminal: `anchor compare clickhouse-mcp-server obsessiondb`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/clickhouse-mcp-server.json and https://www.anchorterminal.com/api/v1/tools/obsessiondb.json\n\n## Other comparisons with ClickHouse MCP Server or ObsessionDB\n\n- [ClickHouse MCP Server vs PlanetScale MCP Server](https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-planetscale-mcp.md)\n- [ClickHouse MCP Server vs Postgres MCP Pro](https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-postgres-mcp-pro.md)\n- [ClickHouse MCP Server vs PostgreSQL (archived MCP reference server)](https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-postgres-reference-server-archived.md)\n- [ClickHouse MCP Server vs Snowflake-managed MCP server](https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-snowflake-managed.md)\n- [ClickHouse MCP Server vs Supabase API + MCP](https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-supabase-mcp.md)\n- [ObsessionDB vs PlanetScale MCP Server](https://www.anchorterminal.com/compare/obsessiondb-vs-planetscale-mcp.md)\n- [ObsessionDB vs Postgres MCP Pro](https://www.anchorterminal.com/compare/obsessiondb-vs-postgres-mcp-pro.md)\n- [ObsessionDB vs PostgreSQL (archived MCP reference server)](https://www.anchorterminal.com/compare/obsessiondb-vs-postgres-reference-server-archived.md)\n- [ObsessionDB vs Snowflake-managed MCP server](https://www.anchorterminal.com/compare/obsessiondb-vs-snowflake-managed.md)\n- [ObsessionDB vs Supabase API + MCP](https://www.anchorterminal.com/compare/obsessiondb-vs-supabase-mcp.md)\n- [ClickHouse MCP Server vs MongoDB MCP Server](https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-mongodb-mcp.md)\n- [ClickHouse MCP Server vs Redis MCP](https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-redis-mcp.md)\n- [MongoDB MCP Server vs ObsessionDB](https://www.anchorterminal.com/compare/mongodb-mcp-vs-obsessiondb.md)\n- [ObsessionDB vs Redis MCP](https://www.anchorterminal.com/compare/obsessiondb-vs-redis-mcp.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": "2026-10-21", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.6", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "ClickHouse MCP Server vs ObsessionDB", "url": "" } ], "description": "ClickHouse scores 64.6 (B) to ObsessionDB's 41.1 (E) for sql databases. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "ClickHouse MCP Server B 64.6", "ObsessionDB E 41.1", "scores" ], "h1": "ClickHouse MCP Server vs ObsessionDB", "image": "https://www.anchorterminal.com/assets/og/compare-clickhouse-mcp-server-vs-obsessiondb.png", "path": "/compare/clickhouse-mcp-server-vs-obsessiondb", "published": "2026-10-01", "section": "tools", "title": "ClickHouse vs ObsessionDB for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-10-21", "url": "https://www.anchorterminal.com/compare/clickhouse-mcp-server-vs-obsessiondb" }, "tokens": { "markdown": 2500, "slim": 730 }, "version": 1 }