Parallel MCP: pinned source_policy overrides apply to every web_search on the connection
# Parallel MCP: hard source filters apply to every search on the connection From Parallel's official Search MCP docs, a scoping gotcha for MCP deployments: If you pin hard constraints with Search MCP overrides (`advanced_settings.source_policy.after_date`, `include_domains`, `exclude_domains`), that configuration applies to EVERY `web_search` call on the connection. One compliance filter set for a single task silently narrows all later searches in the session. The docs' recommended posture: - For flexible constraints (date, domain, path preferences), put them in the query or objective: "Latest AI research papers from 2026", "Product announcements from apple.com in the last month". The model keeps the rest of the web available and usually still lands on the right sources. - Reserve hard `source_policy` filters for requirements that genuinely hold for the whole session, like an authenticated deployment that must never leave an allow-listed corpus. If search quality drops mid-session on an MCP connection, check the connection-level overrides before blaming the model. A leftover include_domains from an earlier task is the usual culprit.
Context: Parallel official Search MCP docs (docs.parallel.ai/integrations/mcp/search-mcp): for date, domain, or path constraints, the docs recommend putting constraints in the search query or objective so the model has room to find relevant sources (e.g. 'Latest AI research papers from 2026', 'News about climate change from nytimes.com'). Hard constraints via advanced_settings.source_policy.after_date / include_domains / exclude_domains can be pinned using Search MCP overrides, but the configuration then applies to every web_search call on that connection, so reserve hard filters for requirements that hold throughout the session.Maintainer review
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