{"slug": "io-github-chrischall-viator-mcp-io-github-chrischall-viator-mcp-1-1-0", "title": "io.github.chrischall/viator-mcp (io.github.chrischall/viator-mcp@1.1.0)", "summary": "Io.github.chrischall/viator-mcp version 1.1.0, published to the official MCP registry on 2026-09-02 and distributed as @chrischall/viator-mcp on npm, enables search of Viator tours and activities including products, availability, attractions, and destinations. The mcpindex.ai index reports that a semantic screen found no manipulation pattern in the tool's description, though the deterministic conformance probe has not yet been run.", "body_md": "[← Index](/leaderboard)\n\n# io.github.chrischall/viator-mcp\n\nSearch Viator tours and activities — products, availability, attractions, destinations.\n\nThe current version, v1.1.0, was published to the official MCP registry on 2026-09-02. It is distributed as @chrischall/viator-mcp on npm, filed under Search by this index, and declares 4 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; [the index's current counts](/stats) put this record in context.\n\n## Using io.github.chrischall/viator-mcp in Claude, Cursor, Gemini CLI, Cline, or Zed?\n\nMCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and **HOLDs the call** when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use **Install this server** for that).\n\nRewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less\n\n```\nuv tool install mcpindex-gate && mcpindex-config-wire\n```\n\n[method](/methodology)\n\nSemantic screen found no manipulation pattern in the description. Conformance probe not yet run.\n\n`mcpindex.integrity.description`\n\npassINFOevidence“No malicious instructions found”via static_description\n\n- - Semantic screen only - the deterministic conformance probe has not run on this server\n- - Confidence is reported but not yet calibrated (v1)\n- - Screen reads the tool description, not the live behavior\n- - advisory\n- - registry description only no input schema\n- - screen model 8b\n- - Still current: the description we screened is unchanged, re-checked against the registry\n- - The registry listing (version, packages, links) changed after this screen ran - the description we assessed did not\n\nSemantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.\n\nOwn this server? [Screen its description →](/screen)\n\n## That verdict was true at screening time (snapshot 2026-09-02).\n\nContracts can change after screening, with no version bump. The gate pins io.github.chrischall/viator-mcp’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.\n\n[See your first HOLD in 2 minutes →](/guides/install-the-gate-first-hold)\n\nRelated: [how to trust an MCP server](/guides/how-to-trust-an-mcp-server) · [screen before install](/guides/screen-mcp-server-before-install) · [silent contract drift](/guides/mcp-silent-contract-drift)\n\nPeople vet a server before wiring it in. One line on your project site or docs answers that with an independent record: screening verdict, registry provenance, contract drift history. It stays current as new screens and drift events land.\n\n```\n[Independent trust record for io.github.chrischall/viator-mcp](https://mcpindex.ai/server/io-github-chrischall-viator-mcp) - screening verdict, registry provenance, and contract drift monitoring.\nIndependent trust record for io.github.chrischall/viator-mcp - screening verdict, registry provenance, and contract drift monitoring.\n```\n\nA live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.\n\n```\n[](https://mcpindex.ai/server/io-github-chrischall-viator-mcp)\n![\"mcpindex](\"https://mcpindex.ai/api/v1/badge/io-github-chrischall-viator-mcp\")
\n```\n\n`VIATOR_API_KEY`\n\nViator Partner API key (exp-api-key) — free Basic Access affiliate signup at partnerresources.viator.com\n\n`VIATOR_LANGUAGE`\n\nAccept-Language for response text, e.g. en-US, es, fr, de, ja (default en-US)\n\n`VIATOR_CACHE_TTL`\n\nSeconds to cache identical read responses (default 60; 0 disables)\n\n`VIATOR_STATIC_CACHE_TTL`\n\nSeconds to cache reference data — destinations, tags, locations, rates (default 3600; 0 disables)\n\n[methodology](/methodology)\n\n[YTDL RMCPai.dinglebear/rytdl](/server/ai-dinglebear-rytdl)\n\nyt-dlp search, download, metadata, delivery, and Plex workflows over MCP and CLI.\n\n[Fodda Topic & Trend Researchai.fodda/topic-research](/server/ai-fodda-topic-research)\n\nTrend, stats & insight search across PSFK expert graphs with citable sources.\n\n[io.github.chrischall/zillow-mcpio.github.chrischall/zillow-mcp](/server/io-github-chrischall-zillow-mcp)\n\nZillow real-estate for Claude — search, property details, Zestimates, saved searches & homes", "url": "https://wpnews.pro/news/io-github-chrischall-viator-mcp-io-github-chrischall-viator-mcp-1-1-0", "canonical_source": "https://mcpindex.ai/server/io-github-chrischall-viator-mcp", "published_at": "2026-09-02 00:16:51+00:00", "updated_at": "2026-09-02 00:22:32.213505+00:00", "lang": "en", "topics": ["ai-tools"], "entities": ["io.github.chrischall/viator-mcp", "@chrischall/viator-mcp", "mcpindex.ai", "Viator"], "alternates": {"html": "https://wpnews.pro/news/io-github-chrischall-viator-mcp-io-github-chrischall-viator-mcp-1-1-0", "markdown": "https://wpnews.pro/news/io-github-chrischall-viator-mcp-io-github-chrischall-viator-mcp-1-1-0.md", "text": "https://wpnews.pro/news/io-github-chrischall-viator-mcp-io-github-chrischall-viator-mcp-1-1-0.txt", "jsonld": "https://wpnews.pro/news/io-github-chrischall-viator-mcp-io-github-chrischall-viator-mcp-1-1-0.jsonld"}}