fix: declare inputSchema properties for search and timeline MCP tools (#1384 #1413)

Both tools had properties:{} which prevents MCP clients from exposing
params to the LLM, causing every call to send {} and get a 500 error
("Either query or filters required for search").

- search: declare query, limit, project, type, obs_type, dateStart, dateEnd, offset, orderBy
- timeline: declare anchor, query, depth_before, depth_after, project
- Add 3 schema regression tests (static source validation)

Closes #1384
Closes #1413

Co-Authored-By: Claude <noreply@anthropic.com>

src/servers/mcp-server.ts

@@ -188,7 +188,17 @@ NEVER fetch full details without filtering first. 10x token savings.`,
     description: 'Step 1: Search memory. Returns index with IDs. Params: query, limit, project, type, obs_type, dateStart, dateEnd, offset, orderBy',
     inputSchema: {
       type: 'object',
-      properties: {},
+      properties: {
+        query: { type: 'string', description: 'Search query' },
+        limit: { type: 'number', description: 'Max results (default 20)' },
+        project: { type: 'string', description: 'Filter by project name' },
+        type: { type: 'string', description: 'Filter by observation type' },
+        obs_type: { type: 'string', description: 'Filter by obs_type field' },
+        dateStart: { type: 'string', description: 'Start date filter (ISO)' },
+        dateEnd: { type: 'string', description: 'End date filter (ISO)' },
+        offset: { type: 'number', description: 'Pagination offset' },
+        orderBy: { type: 'string', description: 'Sort order: date_desc or date_asc' }
+      },
       additionalProperties: true
     },
     handler: async (args: any) => {
@@ -201,7 +211,13 @@ NEVER fetch full details without filtering first. 10x token savings.`,
     description: 'Step 2: Get context around results. Params: anchor (observation ID) OR query (finds anchor automatically), depth_before, depth_after, project',
     inputSchema: {
       type: 'object',
-      properties: {},
+      properties: {
+        anchor: { type: 'number', description: 'Observation ID to center the timeline around' },
+        query: { type: 'string', description: 'Query to find anchor automatically' },
+        depth_before: { type: 'number', description: 'Items before anchor (default 3)' },
+        depth_after: { type: 'number', description: 'Items after anchor (default 3)' },
+        project: { type: 'string', description: 'Filter by project name' }
+      },
       additionalProperties: true
     },
     handler: async (args: any) => {

tests/servers/mcp-tool-schemas.test.ts

@@ -0,0 +1,56 @@
+/**
+ * Tests for MCP tool inputSchema declarations (fix for #1384 / #1413)
+ *
+ * Validates that search and timeline tools declare their parameters explicitly
+ * so MCP clients (Claude Code) can expose them to the LLM.
+ */
+import { describe, it, expect } from 'bun:test';
+
+// Import the tools array directly — static schema validation, no server needed
+import '../../src/servers/mcp-server.js';
+
+// Re-import via dynamic require to access the tools array
+const mcpServerPath = new URL('../../src/servers/mcp-server.ts', import.meta.url).pathname;
+
+describe('MCP tool inputSchema declarations', () => {
+  let tools: any[];
+
+  // Load tools by reading the source and extracting the exported structure
+  // We test the schema shape directly from the source constants
+  it('search tool declares query parameter', async () => {
+    const src = await Bun.file(mcpServerPath).text();
+
+    // Verify search properties are declared (not empty)
+    expect(src).toContain("name: 'search'");
+    // Check query is declared in properties after the search tool definition
+    const searchSection = src.slice(src.indexOf("name: 'search'"), src.indexOf("name: 'timeline'"));
+    expect(searchSection).toContain("query:");
+    expect(searchSection).toContain("limit:");
+    expect(searchSection).toContain("project:");
+    expect(searchSection).toContain("orderBy:");
+    expect(searchSection).not.toContain("properties: {}");
+  });
+
+  it('timeline tool declares anchor and query parameters', async () => {
+    const src = await Bun.file(mcpServerPath).text();
+
+    const timelineSection = src.slice(
+      src.indexOf("name: 'timeline'"),
+      src.indexOf("name: 'get_observations'")
+    );
+    expect(timelineSection).toContain("anchor:");
+    expect(timelineSection).toContain("query:");
+    expect(timelineSection).toContain("depth_before:");
+    expect(timelineSection).toContain("depth_after:");
+    expect(timelineSection).toContain("project:");
+    expect(timelineSection).not.toContain("properties: {}");
+  });
+
+  it('get_observations still declares ids (regression check)', async () => {
+    const src = await Bun.file(mcpServerPath).text();
+
+    const getObsSection = src.slice(src.indexOf("name: 'get_observations'"));
+    expect(getObsSection).toContain("ids:");
+    expect(getObsSection).toContain("required:");
+  });
+});