feat(coding-agent): add GLM 5.2 prompt preset

packages/coding-agent/CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ### Added
 
+- Added the GLM 5.2 prompt preset with automatic model detection.
+
 ### Fixed
 
 - Fixed inherited Anthropic same-model replay to preserve provider-native server tool blocks around signed thinking, avoiding `thinking` / `redacted_thinking` modification errors on follow-up tool-result requests.

packages/coding-agent/src/core/extensions/builtin/prompt-preset/glm-5-2.ts

@@ -0,0 +1,15 @@
+import { type BuildDynamicSystemPromptOptions, buildDynamicSystemPrompt } from "../../../dynamic-prompt/build.ts";
+
+function buildGlm52Tuning(): string {
+	return `You are running on GLM 5.2: Opus 4.6-class agent behavior tuned toward Fable 5 decisiveness and GPT 5.5 outcome-first coding. Apply literal scopes literally - "every", "all", and "for each" mean the full set. Prefer sufficient context over exhaustive context, pick minor decisions and note them, and use matching tools or skills immediately instead of under-reaching.
+
+Calibrate deliberation. Use extended reasoning only for genuine multi-step uncertainty; routine classification, file edits, and lookups should be decided directly. A cheap tool call beats long internal debate: act, inspect evidence, and verify.
+
+Code toward the destination: define the outcome, constraints, and stopping condition, then work without mechanical step-by-step recitation. In ultrawork mode, maintain absolute certainty discipline: preserve the goal, prove completion with evidence, and do not deliver partial work.
+
+The intent gate routing line is non-optional every turn. For non-trivial tasks, call todowrite with atomic items before starting, keep exactly one item in progress, and complete each item immediately when done.`;
+}
+
+export function buildGlm52Prompt(options: BuildDynamicSystemPromptOptions): string {
+	return buildDynamicSystemPrompt({ ...options, tuningSection: buildGlm52Tuning() });
+}

packages/coding-agent/src/core/extensions/builtin/prompt-preset/presets.ts

@@ -3,6 +3,7 @@ import type { BuildDynamicSystemPromptOptions } from "../../../dynamic-prompt/bu
 import { buildClaudeOpus45Prompt } from "./claude-opus-4-5.ts";
 import { buildClaudeOpus46Prompt } from "./claude-opus-4-6.ts";
 import { buildClaudeOpus47Prompt } from "./claude-opus-4-7.ts";
+import { buildGlm52Prompt } from "./glm-5-2.ts";
 import { buildGpt52Prompt } from "./gpt-5.2.ts";
 import { buildGpt53CodexPrompt } from "./gpt-5.3-codex.ts";
 import { buildGpt54Prompt } from "./gpt-5.4.ts";
@@ -64,6 +65,14 @@ function isKimiK27Model(model: ModelWithPromptPresetMetadata): boolean {
 	return hasKimiK27Signal(model.id) || (model.name !== undefined && hasKimiK27Signal(model.name));
 }
 
+function hasGlm52Signal(value: string): boolean {
+	return /(?:^|[/@._-])glm(?:[._-]|p)5(?:[._-]|p)2(?:$|[/@._:-])/.test(normalizeModelId(value));
+}
+
+function isGlm52Model(model: ModelWithPromptPresetMetadata): boolean {
+	return hasGlm52Signal(model.id) || (model.name !== undefined && hasGlm52Signal(model.name));
+}
+
 type ClaudeOpusVersion = "claude-opus-4-7" | "claude-opus-4-6" | "claude-opus-4-5";
 
 function extractClaudeOpusVersion(modelId: string): ClaudeOpusVersion | undefined {
@@ -107,6 +116,9 @@ export function resolvePresetName(
 	if (claudeVersion) {
 		return claudeVersion;
 	}
+	if (isGlm52Model(model)) {
+		return "glm-5.2";
+	}
 	return undefined;
 }
 
@@ -122,6 +134,8 @@ function buildPreset(name: ResolvedPresetName, options: BuildDynamicSystemPrompt
 			return { name, prompt: buildGpt52Prompt(options) };
 		case "gpt-5":
 			return { name, prompt: buildGpt5Prompt(options) };
+		case "glm-5.2":
+			return { name, prompt: buildGlm52Prompt(options) };
 		case "kimi-k2-7":
 			return { name, prompt: buildKimiK27Prompt(options) };
 		case "kimi-k2-6":

packages/coding-agent/src/core/extensions/builtin/prompt-preset/settings.ts

@@ -5,6 +5,7 @@ export type PromptPresetName =
 	| "claude-opus-4-7"
 	| "claude-opus-4-6"
 	| "claude-opus-4-5"
+	| "glm-5.2"
 	| "kimi-k2-7"
 	| "kimi-k2-6"
 	| "gpt-5"
@@ -24,6 +25,7 @@ const VALID_PRESETS: ReadonlySet<string> = new Set<PromptPresetName>([
 	"claude-opus-4-7",
 	"claude-opus-4-6",
 	"claude-opus-4-5",
+	"glm-5.2",
 	"kimi-k2-7",
 	"kimi-k2-6",
 	"gpt-5",

packages/coding-agent/test/suite/prompt-presets-glm-5-2.test.ts

@@ -0,0 +1,107 @@
+import { type Api, getModels, getProviders, type Model } from "@earendil-works/pi-ai";
+import { describe, expect, it } from "vitest";
+import {
+	type PromptPresetSettings,
+	resolvePreset,
+	resolvePresetName,
+} from "../../src/core/extensions/builtin/prompt-preset/presets.ts";
+
+function createModel(id: string, provider: string, api: Api = "openai-responses"): Model<Api> {
+	return {
+		id,
+		name: id,
+		api,
+		provider,
+		baseUrl: "https://example.com/v1",
+		reasoning: false,
+		input: ["text"],
+		cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+		contextWindow: 128_000,
+		maxTokens: 16_384,
+	};
+}
+
+function hasGlm52CatalogSignal(model: Model<Api>): boolean {
+	const searchable = `${model.id} ${model.name}`.toLowerCase().replace(/\s+/g, "-");
+	return /(?:^|[/@._-])glm(?:[._-]|p)5(?:[._-]|p)2(?:$|[/@._:-])/.test(searchable);
+}
+
+function getGlm52CatalogModels(): Model<Api>[] {
+	return getProviders().flatMap((provider) => (getModels(provider) as Model<Api>[]).filter(hasGlm52CatalogSignal));
+}
+
+describe("GLM 5.2 prompt preset", () => {
+	it.each([
+		"zai-org/glm-5.2",
+		"glm-5.2",
+		"GLM 5.2",
+		"zai-org/glm-5p2",
+		"zai-org/glm_5_2:thinking",
+	])("resolves %s to the glm-5.2 preset", (modelId) => {
+		// given
+		const settings: PromptPresetSettings = { promptPreset: "auto" };
+		const model = createModel(modelId, "openrouter", "openai-responses");
+
+		// when
+		const preset = resolvePreset(model, settings);
+
+		// then
+		expect(preset?.name).toBe("glm-5.2");
+		expect(preset?.prompt).toContain("running on GLM 5.2");
+		expect(preset?.prompt).toContain("absolute certainty");
+		expect(preset?.prompt).toContain("todowrite");
+		expect(preset?.prompt).not.toContain("apply_patch");
+	});
+
+	it.each([
+		"glm-4.6",
+		"zai-org/glm-4.5",
+		"some-glm-compatible-router",
+	])("does not route %s to the glm-5.2 preset", (modelId) => {
+		// given
+		const settings: PromptPresetSettings = { promptPreset: "auto" };
+		const model = createModel(modelId, "openrouter", "openai-responses");
+
+		// when
+		const preset = resolvePreset(model, settings);
+
+		// then
+		expect(preset).toBeUndefined();
+	});
+
+	it("allows settings.json to force glm-5.2 regardless of model id", () => {
+		// given
+		const settings: PromptPresetSettings = { promptPreset: "glm-5.2" };
+		const model = createModel("some-random-model", "custom", "openai-responses");
+
+		// when
+		const preset = resolvePreset(model, settings);
+
+		// then
+		expect(preset?.name).toBe("glm-5.2");
+		expect(preset?.prompt).toContain("running on GLM 5.2");
+	});
+
+	it("returns glm-5.2 preset for every GLM 5.2 built-in catalog model", () => {
+		// given
+		const settings: PromptPresetSettings = { promptPreset: "auto" };
+		const catalogModels = getGlm52CatalogModels();
+		const catalogModelIds = catalogModels.map((model) => `${model.provider}/${model.id}`);
+
+		// when
+		const misses = catalogModels
+			.filter((model) => resolvePresetName(model, settings) !== "glm-5.2")
+			.map((model) => `${model.provider}/${model.id}`);
+
+		// then
+		expect(catalogModelIds).toEqual(
+			expect.arrayContaining([
+				"cloudflare-workers-ai/@cf/zai-org/glm-5.2",
+				"fireworks/accounts/fireworks/models/glm-5p2",
+				"openrouter/z-ai/glm-5.2",
+				"zai/glm-5.2",
+			]),
+		);
+		expect(misses).toEqual([]);
+	});
+});