## REMOVED Requirements

### Requirement: Collection abstraction in MCP server

The MCP server SHALL NOT maintain any collection abstraction. The following SHALL be removed:

- Constants: `COLLECTION_TAG_PREFIX`, `DEFAULT_COLLECTION`
- Functions: `_collection_tag`, `_strip_collection_tags`, `_process_document`, `_process_search_results`, `_ensure_exclusive_collection`
- Tool: `kb_set_collection` (entire tool)
- Parameters: `collection` from `kb_search`, `kb_addnote`, `kb_upload_start`

Documents SHALL be returned as-is from the engine with all tags visible. No tag stripping or collection field injection SHALL occur.

#### Scenario: Search results show all tags

- **WHEN** `kb_search` is called and a result has tags `["agent:mybot", "collection:documents", "draft"]`
- **THEN** all three tags SHALL be returned as-is — no stripping of `collection:*` tags

#### Scenario: kb_set_collection no longer exists

- **WHEN** an MCP client attempts to call `kb_set_collection`
- **THEN** the tool SHALL not be found (removed)

## MODIFIED Requirements

### Requirement: kb_search without collection parameter

The `kb_search` MCP tool SHALL accept `tags` (optional list of str) for filtering but SHALL NOT accept a `collection` parameter. Callers that previously used `collection="memory"` SHALL instead use `tags=["collection:memory"]` or whatever tag convention they prefer.

#### Scenario: Filter by tag instead of collection

- **WHEN** `kb_search(query="test", tags=["agent:mybot"])` is called
- **THEN** results SHALL be filtered to documents tagged "agent:mybot"
- **AND** no collection field SHALL be present in the response

### Requirement: kb_addnote without collection parameter

The `kb_addnote` MCP tool SHALL accept `tags` (optional list of str) but SHALL NOT accept a `collection` parameter. The tool SHALL NOT automatically apply any default collection tag — only explicitly provided tags are applied.

#### Scenario: Add note with explicit tags

- **WHEN** `kb_addnote(text="hello", tags=["agent:mybot", "memory"])` is called
- **THEN** the note SHALL be created with exactly those two tags — no `collection:documents` tag added

### Requirement: kb_upload_start without collection parameter

The `kb_upload_start` MCP tool SHALL accept `tags` (optional list of str) but SHALL NOT accept a `collection` parameter. The tool SHALL NOT automatically apply any default collection tag.

### Requirement: kb_update_note without collection processing

The `kb_update_note` MCP tool SHALL return the document as-is from the engine without passing it through `_process_document`. All tags SHALL be visible in the response.

### Requirement: kb_get without collection processing

The `kb_get` MCP tool SHALL return documents as-is from the engine without passing through `_process_document`. All tags SHALL be visible in the response. No `collection` field SHALL be injected.