Harness spec 1.2.0: the library's tools fit both projects; the CLI implements it

The CLI's facts in memory, notes_search, note_manage, skills_list,
skill_view and skill_manage are `variables` now, filled with the CLI's own
values (src/tool/spec-vars.ts): every description and parameter list the CLI
sends is word for word what 1.1.0 said, except note and document ids, which
are strings on both sides (a number is still taken). Descriptions are
filled by the prompt texts' rules, parameter descriptions too. `narrow`
says what a project offers of a shared tool's parameters. Memory's changes
are one pure function (applyOps). Conformance: fill, narrow, memory.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/harness.test.ts

@@ -5,7 +5,7 @@ import { expect, test } from "bun:test"
 import { readdirSync, readFileSync } from "node:fs"
 import { join, relative } from "node:path"
 import { z } from "zod"
-import { HARNESS_VERSION, PURPOSE_DEF, TOOL_SPECS } from "../src/harness.ts"
+import { fillDescription, HARNESS_VERSION, narrowParameters, PURPOSE_DEF, TOOL_SPECS } from "../src/harness.ts"
 import { createApp, stricterMode } from "../src/app.ts"
 import { paths } from "../src/config/paths.ts"
 import { mkdirSync, mkdtempSync, writeFileSync } from "node:fs"
@@ -15,7 +15,7 @@ import { promptText } from "../src/prompt/assemble.ts"
 import { normalise, type Plan } from "../src/plan/plan.ts"
 import { canonicalToolNames, resolveCall } from "../src/tool/names.ts"
 import { BUILTIN_TOOLS } from "../src/tool/registry.ts"
-import { purposeKey, type Tool, type ToolContext } from "../src/tool/tool.ts"
+import { purposeKey, toSpec, type Tool, type ToolContext } from "../src/tool/tool.ts"
 
 const HARNESS = join(import.meta.dir, "..", "harness")
 const ours: Tool[] = [...BUILTIN_TOOLS]
@@ -74,7 +74,7 @@ test("every tool the spec gives the CLI is built in, and every built-in tool is
 for (const t of ours) {
   test(`${t.name}: the spec's parameters, description, flags and risk are this tool's`, () => {
     const s = TOOL_SPECS[t.name]!
-    expect(t.description).toBe(s.description)
+    expect(t.description).toBe(t.vars ? fillDescription(s.description, t.vars) : s.description)
     expect(zodShape(t)).toEqual(shape(s.parameters))
     expect(t.exclusive === true).toBe(s.exclusive)
     expect(purposeKey(t) ?? false).toBe(s.purpose)
@@ -147,6 +147,16 @@ test("the personality presets are shared prompt texts, one paragraph each", () =
   }
 })
 
+test("every narrow in the spec is a subset its project can offer, of a shared tool", () => {
+  for (const s of Object.values(TOOL_SPECS)) {
+    for (const [project, n] of Object.entries(s.narrow ?? {})) {
+      expect(s.scope).toBe("shared")
+      expect(["cli", "llembas"]).toContain(project)
+      expect(() => narrowParameters(s.parameters, n)).not.toThrow()
+    }
+  }
+})
+
 test("modes.json is the modes the CLI has, loosest first, with the same former names", () => {
   const modes = JSON.parse(readFileSync(join(HARNESS, "permission", "modes.json"), "utf8")) as { order: string[]; aliases: Record<string, string>; modes: Record<string, unknown> }
   expect([...MODES].sort() as string[]).toEqual(Object.keys(modes.modes).sort())
@@ -156,14 +166,19 @@ test("modes.json is the modes the CLI has, loosest first, with the same former n
 
 test("every {{variable}} in a description is declared, and none reaches a model", () => {
   for (const s of Object.values(TOOL_SPECS)) {
-    const used = [...s.description.matchAll(/\{\{(\w+)\}\}/g)].map((m) => m[1]!)
+    // In the description, and in any description inside the parameters.
+    const text = s.description + JSON.stringify(s.parameters)
+    const used = [...new Set([...text.matchAll(/\{\{(\w+)\}\}/g)].map((m) => m[1]!))]
     expect(used.sort()).toEqual(Object.keys(s.variables ?? {}).sort())
   }
   mkdirSync(paths.config, { recursive: true })
   writeFileSync(join(paths.config, "connections.yaml"), "connections:\n  f:\n    dialect: openai-chat\n    base_url: http://127.0.0.1:9/v1\n    models: { m: {} }\n", { mode: 0o600 })
   writeFileSync(join(paths.config, "config.yaml"), "model: f/m\nlimits: { bash_timeout: 90 }\n")
   const app = createApp({ cwd: mkdtempSync(join(tmpdir(), "ph-vars-")), store: false, snapshots: false, asker: { ask: async () => ({ kind: "once" }) } })
-  for (const t of app.engine.o.tools) expect(t.description).not.toContain("{{")
+  for (const t of app.engine.o.tools) {
+    expect(t.description).not.toContain("{{")
+    expect(JSON.stringify(toSpec(t).parameters)).not.toContain("{{")
+  }
   const bash = app.engine.o.tools.find((t) => t.name === "bash")!
   expect(bash.description).toContain("default 90 seconds, `timeout` up to 10 minutes). For a server")
   expect(PURPOSE_DEF.schema).toEqual({ type: "string", description: expect.stringContaining("what this call is for") })