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The engine took `note_type` and `task_kind` all along. What was missing was a way to say them: the MCP tool's `content_type` knew `note`, `task` and `all`, and `/api/search` knew the same two — so an agent could not ask "has this snippet already been recorded" or "what lessons apply here" without searching everything and reading past the rest. Browse offered nine kinds from the same data. The cause is that each door kept its own map. `_FACETS` in services/knowledge is where a kind is declared, and #3161 made adding one a single edit by generating the SQL filter, the Python predicate and the door's validation from it — but the two search doors were written before that and never joined. So this adds the third dialect, `search_filters_for`, and one composition over it, `content_type_filters`, and both doors now derive instead of listing. Two names keep a meaning of their own, and the docstrings say so: `all` is no filter, and `note` is BROAD — any non-task, snippets and lessons included — where the browse facet of the same name is narrow (`note_type == 'note'`). They are left different deliberately; narrowing this one would stop returning snippets to every caller that already asks this way. An unrecognised kind is now refused rather than answered. Both doors used to fall through: the MCP tool into a filter matching no row, the route into no filter at all, so `?content_type=snippets` returned the whole corpus while looking like a narrowed search. An empty result set is a claim — "the corpus holds nothing like this" — and an agent acts on that claim by building the thing it could not find, so a typo must not be able to make it. The docstring is the agent-facing contract (#2846), and a test now holds it to the table: every kind `_FACETS` declares has to appear in it, because a filter an agent has not been told about is unreachable however well it is wired. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy