From 1b742eb8ae06bc9426b233d7ff51b6b373ec65f4 Mon Sep 17 00:00:00 2001
From: awork <awork@bot>
Date: Fri, 14 Aug 2026 00:03:45 +0800
Subject: [PATCH 1/2] feat(compact): route /compact through the ACP compression
 pipeline
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Intercept Pi's session_before_compact: instead of cancelling native
compaction, pick a compressible span (selectRangeSpan), summarize it with a
model, and applyCompression, then hand the summary back to Pi as the
compaction result. On any failure (no compressible ranges, no usable model,
unparseable response, kernel rejection, exception) return undefined so Pi
falls back to its own compaction rather than losing context.

The summary prompt is built from the kernel's load-bearing compression rules
(compressPhilosophy + howToCompressRules) via the Prompts interface, so
/compact honors acp.json prompt overrides and stays consistent with the
compress tool — NOT a hand-rolled prompt that would drift from the rules.

Model resolution: explicit compressModel (provider:modelId in acp.json) wins,
else the current session model (zero-config). Adds @earendil-works/pi-ai as a
devDependency for the complete() type (kept external at runtime via tsup).

Extracted from #119 (lsmir2).
---
 package-lock.json           | 1350 +++++++++++++++++++++++++++++++++--
 package.json                |    1 +
 src/auto-compress.ts        |  202 ++++++
 src/index.ts                |   81 ++-
 tests/auto-compress.test.ts |  197 +++++
 tests/integration.test.ts   |    7 +-
 6 files changed, 1782 insertions(+), 56 deletions(-)
 create mode 100644 src/auto-compress.ts
 create mode 100644 tests/auto-compress.test.ts

diff --git a/package-lock.json b/package-lock.json
index 6c7600c..10aa76c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
 			"version": "0.1.36",
 			"license": "MIT",
 			"devDependencies": {
+				"@earendil-works/pi-ai": "^0.83.0",
 				"@earendil-works/pi-coding-agent": "0.83.0",
 				"@types/node": "^26.1.2",
 				"acp-kernel": "0.0.22",
@@ -17,13 +18,536 @@
 				"typescript": "^7.0.2"
 			},
 			"engines": {
-				"node": ">=20"
+				"node": ">=20"
+			},
+			"peerDependencies": {
+				"@earendil-works/pi-coding-agent": "*",
+				"typebox": "*"
+			}
+		},
+		"node_modules/@anthropic-ai/sdk": {
+			"version": "0.91.1",
+			"resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.91.1.tgz",
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+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"json-schema-to-ts": "^3.1.1"
+			},
+			"bin": {
+				"anthropic-ai-sdk": "bin/cli"
+			},
+			"peerDependencies": {
+				"zod": "^3.25.0 || ^4.0.0"
+			},
+			"peerDependenciesMeta": {
+				"zod": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/@aws-crypto/sha256-browser": {
+			"version": "5.2.0",
+			"resolved": "https://registry.npmjs.org/@aws-crypto/sha256-browser/-/sha256-browser-5.2.0.tgz",
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+			"license": "Apache-2.0",
+			"dependencies": {
+				"@aws-crypto/sha256-js": "^5.2.0",
+				"@aws-crypto/supports-web-crypto": "^5.2.0",
+				"@aws-crypto/util": "^5.2.0",
+				"@aws-sdk/types": "^3.222.0",
+				"@aws-sdk/util-locate-window": "^3.0.0",
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+				"tslib": "^2.6.2"
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+				"@aws-sdk/eventstream-handler-node": "^3.972.16",
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+				"@aws-sdk/credential-provider-web-identity": "^3.972.74",
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+			"version": "4.0.1",
+			"resolved": "https://registry.npmjs.org/jws/-/jws-4.0.1.tgz",
+			"integrity": "sha512-EKI/M/yqPncGUUh44xz0PxSidXFr/+r0pA70+gIYhjv+et7yxM+s29Y+VGDkovRofQem0fs7Uvf4+YmAdyRduA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"jwa": "^2.0.1",
+				"safe-buffer": "^5.0.1"
 			}
 		},
 		"node_modules/lilconfig": {
@@ -3415,6 +4458,13 @@
 				"node": "^12.20.0 || ^14.13.1 || >=16.0.0"
 			}
 		},
+		"node_modules/long": {
+			"version": "5.3.2",
+			"resolved": "https://registry.npmjs.org/long/-/long-5.3.2.tgz",
+			"integrity": "sha512-mNAgZ1GmyNhD7AuqnTG3/VQ26o760+ZYBPKjPvugO8+nLbYfX6TVpJPseBvopbdY+qpZ/lKUnmEc1LeZYS3QAA==",
+			"dev": true,
+			"license": "Apache-2.0"
+		},
 		"node_modules/magic-string": {
 			"version": "0.30.21",
 			"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.21.tgz",
@@ -3457,6 +4507,46 @@
 				"thenify-all": "^1.0.0"
 			}
 		},
+		"node_modules/node-domexception": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
+			"integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ==",
+			"deprecated": "Use your platform's native DOMException instead",
+			"dev": true,
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/jimmywarting"
+				},
+				{
+					"type": "github",
+					"url": "https://paypal.me/jimmywarting"
+				}
+			],
+			"license": "MIT",
+			"engines": {
+				"node": ">=10.5.0"
+			}
+		},
+		"node_modules/node-fetch": {
+			"version": "3.3.2",
+			"resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.3.2.tgz",
+			"integrity": "sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"data-uri-to-buffer": "^4.0.0",
+				"fetch-blob": "^3.1.4",
+				"formdata-polyfill": "^4.0.10"
+			},
+			"engines": {
+				"node": "^12.20.0 || ^14.13.1 || >=16.0.0"
+			},
+			"funding": {
+				"type": "opencollective",
+				"url": "https://opencollective.com/node-fetch"
+			}
+		},
 		"node_modules/object-assign": {
 			"version": "4.1.1",
 			"resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
@@ -3467,6 +4557,49 @@
 				"node": ">=0.10.0"
 			}
 		},
+		"node_modules/openai": {
+			"version": "6.26.0",
+			"resolved": "https://registry.npmjs.org/openai/-/openai-6.26.0.tgz",
+			"integrity": "sha512-zd23dbWTjiJ6sSAX6s0HrCZi41JwTA1bQVs0wLQPZ2/5o2gxOJA5wh7yOAUgwYybfhDXyhwlpeQf7Mlgx8EOCA==",
+			"dev": true,
+			"license": "Apache-2.0",
+			"bin": {
+				"openai": "bin/cli"
+			},
+			"peerDependencies": {
+				"ws": "^8.18.0",
+				"zod": "^3.25 || ^4.0"
+			},
+			"peerDependenciesMeta": {
+				"ws": {
+					"optional": true
+				},
+				"zod": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/p-retry": {
+			"version": "4.6.2",
+			"resolved": "https://registry.npmjs.org/p-retry/-/p-retry-4.6.2.tgz",
+			"integrity": "sha512-312Id396EbJdvRONlngUx0NydfrIQ5lsYu0znKVUzVvArzEIt08V1qhtyESbGVd1FGX7UKtiFp5uwKZdM8wIuQ==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@types/retry": "0.12.0",
+				"retry": "^0.13.1"
+			},
+			"engines": {
+				"node": ">=8"
+			}
+		},
+		"node_modules/partial-json": {
+			"version": "0.1.7",
+			"resolved": "https://registry.npmjs.org/partial-json/-/partial-json-0.1.7.tgz",
+			"integrity": "sha512-Njv/59hHaokb/hRUjce3Hdv12wd60MtM9Z5Olmn+nehe0QDAsRtRbJPvJ0Z91TusF0SuZRIvnM+S4l6EIP8leA==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/pathe": {
 			"version": "2.0.3",
 			"resolved": "https://registry.npmjs.org/pathe/-/pathe-2.0.3.tgz",
@@ -3559,6 +4692,30 @@
 				}
 			}
 		},
+		"node_modules/protobufjs": {
+			"version": "7.6.5",
+			"resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-7.6.5.tgz",
+			"integrity": "sha512-/FPD0nUc9jH6rfFjji9IBqOz4pcSE3CsT1m7Ep6Mdb0LxSUMj8hgl6GomOvZzpNpAqqGaXA0P3VSrZLFzIhQrw==",
+			"dev": true,
+			"hasInstallScript": true,
+			"license": "BSD-3-Clause",
+			"dependencies": {
+				"@protobufjs/aspromise": "^1.1.2",
+				"@protobufjs/base64": "^1.1.2",
+				"@protobufjs/codegen": "^2.0.5",
+				"@protobufjs/eventemitter": "^1.1.1",
+				"@protobufjs/fetch": "^1.1.1",
+				"@protobufjs/float": "^1.0.2",
+				"@protobufjs/path": "^1.1.2",
+				"@protobufjs/pool": "^1.1.0",
+				"@protobufjs/utf8": "^1.1.1",
+				"@types/node": ">=13.7.0",
+				"long": "^5.3.2"
+			},
+			"engines": {
+				"node": ">=12.0.0"
+			}
+		},
 		"node_modules/readdirp": {
 			"version": "4.1.2",
 			"resolved": "https://registry.npmjs.org/readdirp/-/readdirp-4.1.2.tgz",
@@ -3583,6 +4740,16 @@
 				"node": ">=8"
 			}
 		},
+		"node_modules/retry": {
+			"version": "0.13.1",
+			"resolved": "https://registry.npmjs.org/retry/-/retry-0.13.1.tgz",
+			"integrity": "sha512-XQBQ3I8W1Cge0Seh+6gjj03LbmRFWuoszgK9ooCpwYIrhhoO80pfq4cUkU5DkknwfOfFteRwlZ56PYOGYyFWdg==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">= 4"
+			}
+		},
 		"node_modules/rollup": {
 			"version": "4.62.3",
 			"resolved": "https://registry.npmjs.org/rollup/-/rollup-4.62.3.tgz",
@@ -3628,6 +4795,27 @@
 				"fsevents": "~2.3.2"
 			}
 		},
+		"node_modules/safe-buffer": {
+			"version": "5.2.1",
+			"resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+			"integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+			"dev": true,
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/feross"
+				},
+				{
+					"type": "patreon",
+					"url": "https://www.patreon.com/feross"
+				},
+				{
+					"type": "consulting",
+					"url": "https://feross.org/support"
+				}
+			],
+			"license": "MIT"
+		},
 		"node_modules/source-map": {
 			"version": "0.7.6",
 			"resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.6.tgz",
@@ -3718,6 +4906,13 @@
 				"tree-kill": "cli.js"
 			}
 		},
+		"node_modules/ts-algebra": {
+			"version": "2.0.0",
+			"resolved": "https://registry.npmjs.org/ts-algebra/-/ts-algebra-2.0.0.tgz",
+			"integrity": "sha512-FPAhNPFMrkwz76P7cdjdmiShwMynZYN6SgOujD1urY4oNm80Ou9oMdmbR45LotcKOXoy7wSmHkRFE6Mxbrhefw==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/ts-interface-checker": {
 			"version": "0.1.13",
 			"resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
@@ -3725,6 +4920,13 @@
 			"dev": true,
 			"license": "Apache-2.0"
 		},
+		"node_modules/tslib": {
+			"version": "2.8.1",
+			"resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+			"integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+			"dev": true,
+			"license": "0BSD"
+		},
 		"node_modules/tsup": {
 			"version": "8.5.1",
 			"resolved": "https://registry.npmjs.org/tsup/-/tsup-8.5.1.tgz",
@@ -4336,6 +5538,58 @@
 			"integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
 			"dev": true,
 			"license": "MIT"
+		},
+		"node_modules/web-streams-polyfill": {
+			"version": "3.3.3",
+			"resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.3.3.tgz",
+			"integrity": "sha512-d2JWLCivmZYTSIoge9MsgFCZrt571BikcWGYkjC1khllbTeDlGqZ2D8vD8E/lJa8WGWbb7Plm8/XJYV7IJHZZw==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">= 8"
+			}
+		},
+		"node_modules/ws": {
+			"version": "8.21.3",
+			"resolved": "https://registry.npmjs.org/ws/-/ws-8.21.3.tgz",
+			"integrity": "sha512-201TZ/kPWxoPr/OKWjquZR1SWKXcvxdH+e1xrx89b3YbmzLMFCLfnaG1HFIgWzJOEWZ7MvpK++odZufgYR50Rw==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=10.0.0"
+			},
+			"peerDependencies": {
+				"bufferutil": "^4.0.1",
+				"utf-8-validate": ">=5.0.2"
+			},
+			"peerDependenciesMeta": {
+				"bufferutil": {
+					"optional": true
+				},
+				"utf-8-validate": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/zod": {
+			"version": "4.4.3",
+			"resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
+			"integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
+			"dev": true,
+			"license": "MIT",
+			"funding": {
+				"url": "https://github.com/sponsors/colinhacks"
+			}
+		},
+		"node_modules/zod-to-json-schema": {
+			"version": "3.25.2",
+			"resolved": "https://registry.npmjs.org/zod-to-json-schema/-/zod-to-json-schema-3.25.2.tgz",
+			"integrity": "sha512-O/PgfnpT1xKSDeQYSCfRI5Gy3hPf91mKVDuYLUHZJMiDFptvP41MSnWofm8dnCm0256ZNfZIM7DSzuSMAFnjHA==",
+			"dev": true,
+			"license": "ISC",
+			"peerDependencies": {
+				"zod": "^3.25.28 || ^4"
+			}
 		}
 	}
 }
diff --git a/package.json b/package.json
index 63d8c4c..8b0b263 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,7 @@
 		"typebox": "*"
 	},
 	"devDependencies": {
+		"@earendil-works/pi-ai": "^0.83.0",
 		"@earendil-works/pi-coding-agent": "0.83.0",
 		"@types/node": "^26.1.2",
 		"acp-kernel": "0.0.22",
diff --git a/src/auto-compress.ts b/src/auto-compress.ts
new file mode 100644
index 0000000..cb86373
--- /dev/null
+++ b/src/auto-compress.ts
@@ -0,0 +1,202 @@
+import { readFileSync } from "node:fs";
+import { homedir } from "node:os";
+import { join } from "node:path";
+import { complete } from "@earendil-works/pi-ai/compat";
+import type { ExtensionContext } from "@earendil-works/pi-coding-agent";
+import { CONFIG_DIR_NAME } from "@earendil-works/pi-coding-agent";
+import type { CoreMessage, CompressionState, CompressibleRange, Prompts } from "acp-kernel";
+import { debug, logInfo, logWarn } from "./log.js";
+
+const TIMEOUT_MS = 60_000;
+const MAX_OUTPUT_TOKENS = 3000;
+const MAX_SLICE_CHARS = 150_000;
+const MAX_MSG_CHARS = 4000;
+
+/** Reads `compressModel` from `~/.<CONFIG_DIR_NAME>/acp.json as `provider:modelId`. */
+export function readCompressModel(): string | null {
+  try {
+    const cfg = JSON.parse(readFileSync(join(homedir(), CONFIG_DIR_NAME, "acp.json"), "utf8")) as Record<string, unknown>;
+    return typeof cfg.compressModel === "string" && cfg.compressModel.length > 0 ? cfg.compressModel : null;
+  } catch {
+    return null;
+  }
+}
+
+export function resolveCompressModel<T extends { provider: string; id: string }>(
+  registry: { find(provider: string, modelId: string): T | undefined },
+  currentModel: T | undefined,
+  configured: string | null,
+): { model: T; label: string } | null {
+  if (configured) {
+    const sep = configured.indexOf(":");
+    const provider = sep > 0 ? configured.slice(0, sep) : "openai";
+    const modelId = sep > 0 ? configured.slice(sep + 1) : configured;
+    const model = registry.find(provider, modelId);
+    return model ? { model, label: configured } : null;
+  }
+  return currentModel ? { model: currentModel, label: `${currentModel.provider}:${currentModel.id}` } : null;
+}
+
+function refNum(ref: string): number {
+  const m = /^m(\d+)$/.exec(ref);
+  return m ? parseInt(m[1]!, 10) : -1;
+}
+
+export function sliceRange(messages: CoreMessage[], state: CompressionState, startRef: string, endRef: string): CoreMessage[] {
+  const lo = refNum(startRef);
+  const hi = refNum(endRef);
+  return messages.filter((m) => {
+    const ref = state.messageRefs.byRaw[m.id];
+    if (!ref) return false;
+    const n = refNum(ref);
+    return n >= lo && n <= hi;
+  });
+}
+
+/** Pick the compressible span to compress. The kernel's recommended ranges are
+ *  small groups (split at user boundaries and protected gaps) that routinely
+ *  fall below `minCompressRange`, which the kernel would reject. Seed on the
+ *  largest range and expand to adjacent ranges (smallest gap first) until the
+ *  span covers enough text — counting every message in the span, matching the
+ *  kernel's own validation. Returns null when even the whole compressible set
+ *  is below the threshold. */
+export function selectRangeSpan(
+  ranges: CompressibleRange[],
+  messages: CoreMessage[],
+  state: CompressionState,
+  minChars: number,
+): { startRef: string; endRef: string; tokens: number } | null {
+  const sorted = [...ranges].sort((a, b) => refNum(a.startRef) - refNum(b.startRef));
+  if (sorted.length === 0) return null;
+  let seed = 0;
+  for (let i = 1; i < sorted.length; i++) {
+    if (sorted[i]!.tokens > sorted[seed]!.tokens) seed = i;
+  }
+  const charsOf = (startRef: string, endRef: string): number =>
+    sliceRange(messages, state, startRef, endRef).reduce((n, m) => n + (m.text?.length ?? 0), 0);
+  let lo = seed;
+  let hi = seed;
+  let startRef = sorted[lo]!.startRef;
+  let endRef = sorted[hi]!.endRef;
+  let chars = charsOf(startRef, endRef);
+  while (chars < minChars && (lo > 0 || hi < sorted.length - 1)) {
+    const leftGap = lo > 0 ? refNum(sorted[lo]!.startRef) - refNum(sorted[lo - 1]!.endRef) : Number.POSITIVE_INFINITY;
+    const rightGap = hi < sorted.length - 1 ? refNum(sorted[hi + 1]!.startRef) - refNum(sorted[hi]!.endRef) : Number.POSITIVE_INFINITY;
+    if (leftGap <= rightGap) lo--;
+    else hi++;
+    startRef = sorted[lo]!.startRef;
+    endRef = sorted[hi]!.endRef;
+    chars = charsOf(startRef, endRef);
+  }
+  if (chars < minChars) return null;
+  return { startRef, endRef, tokens: Math.ceil(chars / 4) };
+}
+
+export function formatSlice(slice: CoreMessage[], state: CompressionState): string {
+  let out = "";
+  let skipped = 0;
+  for (let i = 0; i < slice.length; i++) {
+    const m = slice[i]!;
+    const ref = state.messageRefs.byRaw[m.id] ?? m.id;
+    const role = m.role === "tool" ? "tool result" : m.role;
+    const raw = m.text ?? "";
+    const text = raw.slice(0, MAX_MSG_CHARS);
+    const cut = text.length < raw.length;
+    const line = `[${ref}] ${role}${m.toolName ? ` (${m.toolName})` : ""}: ${text}${cut ? " …[truncated]" : ""}\n`;
+    if (out.length + line.length > MAX_SLICE_CHARS) {
+      skipped = slice.length - i;
+      break;
+    }
+    out += line;
+  }
+  if (skipped > 0) {
+    out += `…[truncated: ${skipped} more message(s) in range not shown — cover them in the summary or split the range]\n`;
+  }
+  return out;
+}
+
+export function parseSummary(text: string): string | null {
+  const cleaned = text.replace(/^```(?:json)?\s*/i, "").replace(/\s*```$/, "").trim();
+  try {
+    const obj = JSON.parse(cleaned) as { summary?: unknown };
+    if (typeof obj.summary === "string" && obj.summary.length > 0) return obj.summary;
+  } catch {
+    // never guess — fall back so the caller lets Pi do its native compaction
+  }
+  return null;
+}
+
+/** Build the summary-generation system prompt FROM the kernel's load-bearing
+ *  compression rules (the same `Prompts` the compress tool and tier-1
+ *  compression use), so /compact honors `acp.json` prompt overrides and stays
+ *  consistent with the rest of the ACP pipeline. `/compact` compresses an old
+ *  contiguous range, so the tier-1 `howToCompressRules` are the right rule
+ *  set (not tier-2/tier-3 distillation rules). */
+export function buildSummaryPrompt(prompts: Prompts): string {
+  return (
+    prompts.compressPhilosophy.trim() +
+    "\n\n" +
+    prompts.howToCompressRules.trim() +
+    "\n\nCompress the message range provided below into ONE dense, self-contained technical summary " +
+    "following the rules above. Output ONLY a JSON object: " +
+    '{"summary": "..."} ' +
+    "where the value is the full summary as a single string."
+  );
+}
+
+/** Generate a summary for a message range using the compression model. Shared
+ *  entry point for the `/compact` handler. Returns null when no model is
+ *  usable, the slice is empty, the model is unauthenticated, or the response
+ *  is unparseable — the caller then returns `undefined` so Pi falls back to
+ *  its native compaction. */
+export async function summarizeRange(
+  ctx: ExtensionContext,
+  messages: CoreMessage[],
+  state: CompressionState,
+  startRef: string,
+  endRef: string,
+  prompts: Prompts,
+): Promise<{ summary: string; model: string } | null> {
+  const configured = readCompressModel();
+  const resolved = resolveCompressModel(ctx.modelRegistry, ctx.model, configured);
+  if (!resolved) return null;
+  const { model, label } = resolved;
+  const slice = sliceRange(messages, state, startRef, endRef);
+  if (slice.length === 0) return null;
+  const tokens = Math.ceil(slice.reduce((n, m) => n + (m.text?.length ?? 0), 0) / 4);
+
+  const auth = await ctx.modelRegistry.getApiKeyAndHeaders(model);
+  if (!auth.ok || !auth.apiKey) {
+    logWarn("summarize-range", { event: "auth-missing", model: label, error: auth.ok ? null : auth.error });
+    return null;
+  }
+
+  const ac = new AbortController();
+  const timer = setTimeout(() => ac.abort(), TIMEOUT_MS);
+  try {
+    const userText =
+      `${buildSummaryPrompt(prompts)}\n\n` +
+      `Message range [${startRef}..${endRef}] (${tokens} tokens, ${slice.length} messages). Compress it:\n\n` +
+      formatSlice(slice, state);
+    const response = await complete(
+      model,
+      { messages: [{ role: "user", content: [{ type: "text", text: userText }], timestamp: Date.now() }] },
+      { apiKey: auth.apiKey, headers: auth.headers, env: auth.env, maxTokens: MAX_OUTPUT_TOKENS, signal: ac.signal },
+    );
+    const summary = parseSummary(
+      response.content.filter((c): c is { type: "text"; text: string } => c.type === "text").map((c) => c.text).join("\n"),
+    );
+    if (!summary) {
+      logWarn("summarize-range", { event: "unparseable-summary", model: label, span: `${startRef}..${endRef}` });
+      return null;
+    }
+    logInfo("summarize-range", { event: "summary", span: `${startRef}..${endRef}`, model: label, tokens, summaryLen: summary.length });
+    return { summary, model: label };
+  } catch (e) {
+    logWarn("summarize-range", { event: "failed", model: label, error: String(e) });
+    return null;
+  } finally {
+    clearTimeout(timer);
+    debug.event("summarize-range-done", { span: `${startRef}..${endRef}`, model: label });
+  }
+}
diff --git a/src/index.ts b/src/index.ts
index 9837e6a..24aab8d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -15,6 +15,7 @@ import { makeStatusTool } from "./status-tool.js";
 import { makeDelegateTool, makeDelegateWaitTool, makeDelegateCancelTool, runningRunsSnapshot, resetDelegateUsage, setDelegateDisplayUsage } from "./delegate-tool.js";
 import { makeCommands } from "./commands.js";
 import { coreOutToAgentMessages } from "./messages.js";
+import { summarizeRange, selectRangeSpan } from "./auto-compress.js";
 import { buildAcpSystemPrompt, ACP_DELEGATE_PROMPT } from "./system-prompt.js";
 import { delegateStatusWidget } from "./fleet-widget.js";
 import { wireToolGuardrails } from "./tool-guardrails.js";
@@ -32,7 +33,7 @@ declare const CURRENT_VERSION: string;
 export function createAcpExtension(adapter: AdapterConfig = {}): ExtensionFactory {
   return (pi: ExtensionAPI) => {
     const runtime = createRuntime(adapter);
-    wireCompactionDisable(pi);
+    wireCompactionDisable(pi, runtime);
     wireSessionLifecycle(pi, runtime);
     wireContextTransform(pi, runtime);
     wireSystemPrompt(pi, runtime);
@@ -49,10 +50,80 @@ export function createAcpExtension(adapter: AdapterConfig = {}): ExtensionFactor
 
 export default createAcpExtension();
 
-// ACP owns compression; cancel Pi's built-in auto-compaction entirely (mirrors
-// opencode-acp requiring opencode's compaction.auto = false).
-function wireCompactionDisable(pi: ExtensionAPI): void {
-  pi.on("session_before_compact", () => ({ cancel: true }));
+// ACP owns compression. On `/compact` we intercept Pi's native compaction and
+// instead run the message range through the kernel's compression pipeline:
+// pick a compressible span, summarize it with a model (explicit `compressModel`
+// or the session model), and applyCompression. We then hand the summary back
+// to Pi as the compaction result so Pi stores it. On any failure we return
+// undefined so Pi falls back to its own compaction rather than losing context.
+function wireCompactionDisable(pi: ExtensionAPI, runtime: AcpRuntime): void {
+  pi.on("session_before_compact", async (event, ctx) => {
+    let release: (() => void) | undefined;
+    try {
+      const sid = ctx.sessionManager?.getSessionId?.() ?? "";
+      release = await runtime.acquireLock(sid);
+      const { state, coreMessages } = await runtime.stateFor(ctx);
+      const config = runtime.configFor(ctx);
+      const coveredIds = collectCoveredMessageIds(state);
+      const tokenCount = estimateTokens(coreMessages, coveredIds);
+
+      const turn = runtime.core.processTurn({ messages: coreMessages, state, config, tokenCount });
+      await runtime.save(turn.state, ctx);
+
+      const ranges = (turn.nudge?.compressibleRanges ?? []).filter((r) => !r.dangerous);
+      if (ranges.length === 0) return undefined;
+
+      const span = selectRangeSpan(ranges, turn.messages, turn.state, config.compress.minCompressRange ?? 5000);
+      if (!span) return undefined;
+
+      ctx.ui?.notify?.(`ACP: compressing ~${span.tokens} tokens…`, "info");
+      const result = await summarizeRange(ctx, turn.messages, turn.state, span.startRef, span.endRef, runtime.prompts);
+      if (!result) {
+        ctx.ui?.notify?.("ACP: compression fell back to Pi native compaction", "warning");
+        return undefined;
+      }
+      const { summary, model } = result;
+
+      const applied = runtime.core.applyCompression({
+        ranges: [{ startRef: span.startRef, endRef: span.endRef, summary }],
+        messages: turn.messages,
+        state: turn.state,
+        config,
+      });
+      const errors = applied.result.errors ?? [];
+      if (errors.length > 0) {
+        logWarn("compact", { sid, event: "rejected", span: `${span.startRef}..${span.endRef}`, model, errors });
+        return undefined;
+      }
+      await runtime.save(applied.state, ctx);
+
+      logInfo("compact", {
+        sid,
+        event: "acp-compaction",
+        span: `${span.startRef}..${span.endRef}`,
+        tokens: span.tokens,
+        model,
+        blocksCreated: applied.result.blocksCreated,
+        reason: event.reason,
+      });
+      debug.event("compact-acp", { sid, span: `${span.startRef}..${span.endRef}`, tokens: span.tokens, model, reason: event.reason });
+
+      ctx.ui?.notify?.(`ACP: compressed ~${span.tokens} tokens via ${model}`, "info");
+
+      return {
+        compaction: {
+          summary,
+          firstKeptEntryId: event.preparation.firstKeptEntryId,
+          tokensBefore: event.preparation.tokensBefore,
+        },
+      };
+    } catch (e) {
+      logThrow("compact", e, { sid: ctx.sessionManager?.getSessionId?.() ?? "" });
+      return undefined;
+    } finally {
+      release?.();
+    }
+  });
 }
 
 // (acp_delegate injection is best-effort: sendUserMessage is fire-and-forget
diff --git a/tests/auto-compress.test.ts b/tests/auto-compress.test.ts
new file mode 100644
index 0000000..6bf5ea7
--- /dev/null
+++ b/tests/auto-compress.test.ts
@@ -0,0 +1,197 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { mkdtempSync, writeFileSync, rmSync, mkdirSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { CONFIG_DIR_NAME } from "@earendil-works/pi-coding-agent";
+import {
+  readCompressModel,
+  resolveCompressModel,
+  sliceRange,
+  selectRangeSpan,
+  formatSlice,
+  parseSummary,
+  buildSummaryPrompt,
+} from "../src/auto-compress.ts";
+import { defaultPrompts } from "acp-kernel";
+
+type CoreMessageLite = { id: string; role: string; text?: string; toolName?: string };
+type StateLite = { messageRefs: { byRaw: Record<string, string> } };
+
+function makeState(ids: string[]): StateLite {
+  const byRaw: Record<string, string> = {};
+  ids.forEach((id, i) => {
+    byRaw[id] = `m${String(i).padStart(5, "0")}`;
+  });
+  return { messageRefs: { byRaw } };
+}
+
+function makeRange(startRef: string, endRef: string, tokens: number) {
+  return { startRef, endRef, tokens, dangerous: false };
+}
+
+test("parseSummary extracts summary from plain JSON object", () => {
+  assert.equal(parseSummary('{"summary":"hello world"}'), "hello world");
+});
+
+test("parseSummary strips ```json fences", () => {
+  assert.equal(parseSummary('```json\n{"summary":"fenced"}\n```'), "fenced");
+});
+
+test("parseSummary returns null on non-JSON, empty, or missing summary", () => {
+  assert.equal(parseSummary("not json at all"), null);
+  assert.equal(parseSummary('{"summary":""}'), null);
+  assert.equal(parseSummary('{"other":"x"}'), null);
+  assert.equal(parseSummary('{"summary":123}'), null);
+});
+
+test("resolveCompressModel: explicit configured model wins", () => {
+  const registry = { find: (p: string, id: string) => (p === "openai" && id === "gpt-4o" ? { provider: p, id } : undefined) };
+  const current = { provider: "anthropic", id: "claude" };
+  const r = resolveCompressModel(registry as never, current as never, "openai:gpt-4o");
+  assert.equal(r?.model.provider, "openai");
+  assert.equal(r?.model.id, "gpt-4o");
+  assert.equal(r?.label, "openai:gpt-4o");
+});
+
+test("resolveCompressModel: configured missing → null (not fallback) so caller surfaces config error", () => {
+  const registry = { find: () => undefined };
+  const current = { provider: "anthropic", id: "claude" };
+  assert.equal(resolveCompressModel(registry as never, current as never, "openai:nonexistent"), null);
+});
+
+test("resolveCompressModel: no config → current session model", () => {
+  const registry = { find: () => undefined };
+  const current = { provider: "anthropic", id: "claude" };
+  const r = resolveCompressModel(registry as never, current as never, null);
+  assert.equal(r?.model.provider, "anthropic");
+  assert.equal(r?.label, "anthropic:claude");
+});
+
+test("resolveCompressModel: bare model id without provider defaults to openai", () => {
+  const registry = { find: (p: string, id: string) => (p === "openai" ? { provider: p, id } : undefined) };
+  const r = resolveCompressModel(registry as never, undefined, "gpt-4o-mini");
+  assert.equal(r?.model.provider, "openai");
+  assert.equal(r?.model.id, "gpt-4o-mini");
+});
+
+test("resolveCompressModel: nothing usable → null", () => {
+  const registry = { find: () => undefined };
+  assert.equal(resolveCompressModel(registry as never, undefined, null), null);
+});
+
+test("readCompressModel returns null when acp.json absent (graceful)", () => {
+  const dir = mkdtempSync(join(tmpdir(), "acp-compact-"));
+  const prev = process.env.HOME;
+  process.env.HOME = dir;
+  try {
+    assert.equal(readCompressModel(), null);
+  } finally {
+    process.env.HOME = prev;
+    rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+test("readCompressModel reads provider:modelId from acp.json", () => {
+  const dir = mkdtempSync(join(tmpdir(), "acp-compact-"));
+  const prev = process.env.HOME;
+  process.env.HOME = dir;
+  try {
+    mkdirSync(join(dir, CONFIG_DIR_NAME), { recursive: true });
+    writeFileSync(join(dir, CONFIG_DIR_NAME, "acp.json"), JSON.stringify({ compressModel: "openai:gpt-4o" }));
+    assert.equal(readCompressModel(), "openai:gpt-4o");
+  } finally {
+    process.env.HOME = prev;
+    rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+test("readCompressModel ignores empty / non-string compressModel", () => {
+  const dir = mkdtempSync(join(tmpdir(), "acp-compact-"));
+  const prev = process.env.HOME;
+  process.env.HOME = dir;
+  try {
+    mkdirSync(join(dir, CONFIG_DIR_NAME), { recursive: true });
+    writeFileSync(join(dir, CONFIG_DIR_NAME, "acp.json"), JSON.stringify({ compressModel: "" }));
+    assert.equal(readCompressModel(), null);
+  } finally {
+    process.env.HOME = prev;
+    rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+test("sliceRange filters messages within the ref span (inclusive)", () => {
+  const ids = ["a", "b", "c", "d", "e"];
+  const msgs: CoreMessageLite[] = ids.map((id) => ({ id, role: "user", text: id }));
+  const state = makeState(ids);
+  const slice = sliceRange(msgs as never, state as never, "m00001", "m00003");
+  assert.deepEqual(slice.map((m) => m.id), ["b", "c", "d"]);
+});
+
+test("sliceRange ignores messages without a ref", () => {
+  const msgs: CoreMessageLite[] = [{ id: "a", role: "user", text: "a" }, { id: "nope", role: "user", text: "x" }];
+  const state = makeState(["a"]);
+  const slice = sliceRange(msgs as never, state as never, "m00000", "m00005");
+  assert.deepEqual(slice.map((m) => m.id), ["a"]);
+});
+
+test("selectRangeSpan returns null when the whole set is below minChars", () => {
+  const ids = ["a", "b"];
+  const msgs: CoreMessageLite[] = ids.map((id) => ({ id, role: "user", text: "tiny" }));
+  const state = makeState(ids);
+  const ranges = [makeRange("m00000", "m00001", 5)];
+  assert.equal(selectRangeSpan(ranges, msgs as never, state as never, 5000), null);
+});
+
+test("selectRangeSpan seeds on largest range and expands until chars >= minChars", () => {
+  const ids = Array.from({ length: 8 }, (_, i) => `m${i}`);
+  const msgs: CoreMessageLite[] = ids.map((id, i) => ({ id: `id${i}`, role: "user", text: "x".repeat(2000) }));
+  const state = makeState(ids.map((_, i) => `id${i}`));
+  const ranges = [
+    makeRange("m00000", "m00001", 100),
+    makeRange("m00003", "m00005", 400),
+    makeRange("m00007", "m00007", 50),
+  ];
+  const span = selectRangeSpan(ranges, msgs as never, state as never, 5000);
+  assert.ok(span, "expected a span");
+  assert.equal(span!.startRef, "m00003");
+  assert.ok(span!.endRef === "m00005" || span!.endRef === "m00007", `endRef=${span!.endRef}`);
+  assert.ok(span!.tokens >= 1250, `tokens=${span!.tokens}`);
+});
+
+test("selectRangeSpan handles empty ranges", () => {
+  const span = selectRangeSpan([], [], { messageRefs: { byRaw: {} } } as never, 5000);
+  assert.equal(span, null);
+});
+
+test("formatSlice annotates refs and truncates oversized single messages", () => {
+  const ids = ["a", "b"];
+  const big = "y".repeat(10000);
+  const msgs: CoreMessageLite[] = [{ id: "a", role: "assistant", text: "short" }, { id: "b", role: "tool", text: big, toolName: "bash" }];
+  const state = makeState(ids);
+  const out = formatSlice(msgs as never, state as never);
+  assert.ok(out.includes("[m00000] assistant: short"));
+  assert.ok(out.includes("[m00001] tool result (bash):"));
+  assert.ok(out.includes("…[truncated]"));
+  assert.ok(!out.includes("y".repeat(10000)));
+});
+
+test("buildSummaryPrompt embeds the kernel compressPhilosophy and howToCompressRules", () => {
+  const prompt = buildSummaryPrompt(defaultPrompts);
+  assert.ok(prompt.includes(defaultPrompts.compressPhilosophy), "must include compressPhilosophy");
+  assert.ok(prompt.includes(defaultPrompts.howToCompressRules), "must include howToCompressRules");
+  assert.ok(prompt.includes('{"summary": "..."}'), "must instruct JSON output shape");
+  assert.ok(!prompt.includes("tier 2") && !prompt.includes("TIER 2"), "must NOT pull in tier-2 distillation rules");
+});
+
+test("buildSummaryPrompt reflects acp.json prompt overrides (not a hard-coded constant)", () => {
+  const custom = {
+    compressPhilosophy: "CUSTOM-PHILOSOPHY-MARKER",
+    howToCompressRules: "CUSTOM-RULES-MARKER",
+    tier2DistillRules: defaultPrompts.tier2DistillRules,
+    tier3CondenseRules: defaultPrompts.tier3CondenseRules,
+  };
+  const prompt = buildSummaryPrompt(custom);
+  assert.ok(prompt.includes("CUSTOM-PHILOSOPHY-MARKER"));
+  assert.ok(prompt.includes("CUSTOM-RULES-MARKER"));
+});
diff --git a/tests/integration.test.ts b/tests/integration.test.ts
index d637cf0..8e08230 100644
--- a/tests/integration.test.ts
+++ b/tests/integration.test.ts
@@ -57,11 +57,12 @@ test("factory registers the compress tool and 4 flat commands", () => {
   assert.ok(handlers.has("before_agent_start"), "system-prompt wired");
 });
 
-test("session_before_compact cancels Pi's auto-compaction", () => {
+test("session_before_compact falls back to Pi native compaction on failure", async () => {
   const { api, handlers } = captureApi();
   createAcpExtension()(api as any);
-  const result = handlers.get("session_before_compact")![0]!({}, {});
-  assert.deepEqual(result, { cancel: true });
+  const handler = handlers.get("session_before_compact")![0]!;
+  const result = await handler({ preparation: { firstKeptEntryId: "x", tokensBefore: 100 } }, {} as any);
+  assert.equal(result, undefined, "no usable state → undefined → Pi falls back to native compaction");
 });
 
 test("before_agent_start appends the ACP system prompt", () => {

From 0cfe17921bf737c2177d20fbb42c18c687a3e48e Mon Sep 17 00:00:00 2001
From: awork <awork@bot>
Date: Fri, 14 Aug 2026 00:14:58 +0800
Subject: [PATCH 2/2] test(compact): set USERPROFILE too so os.homedir()
 resolves on Windows

readCompressModel uses os.homedir(), which reads USERPROFILE on
Windows (not HOME). The three home-scoped tests only set HOME, so
they read the real home dir on Windows CI and failed. Extract a
withHome helper that sets both env vars.
---
 tests/auto-compress.test.ts | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/tests/auto-compress.test.ts b/tests/auto-compress.test.ts
index 6bf5ea7..3e0281c 100644
--- a/tests/auto-compress.test.ts
+++ b/tests/auto-compress.test.ts
@@ -30,6 +30,19 @@ function makeRange(startRef: string, endRef: string, tokens: number) {
   return { startRef, endRef, tokens, dangerous: false };
 }
 
+function withHome<T>(dir: string, fn: () => T): T {
+  const prevHome = process.env.HOME;
+  const prevProfile = process.env.USERPROFILE;
+  process.env.HOME = dir;
+  process.env.USERPROFILE = dir;
+  try {
+    return fn();
+  } finally {
+    process.env.HOME = prevHome;
+    process.env.USERPROFILE = prevProfile;
+  }
+}
+
 test("parseSummary extracts summary from plain JSON object", () => {
   assert.equal(parseSummary('{"summary":"hello world"}'), "hello world");
 });
@@ -82,40 +95,31 @@ test("resolveCompressModel: nothing usable → null", () => {
 
 test("readCompressModel returns null when acp.json absent (graceful)", () => {
   const dir = mkdtempSync(join(tmpdir(), "acp-compact-"));
-  const prev = process.env.HOME;
-  process.env.HOME = dir;
   try {
-    assert.equal(readCompressModel(), null);
+    withHome(dir, () => assert.equal(readCompressModel(), null));
   } finally {
-    process.env.HOME = prev;
     rmSync(dir, { recursive: true, force: true });
   }
 });
 
 test("readCompressModel reads provider:modelId from acp.json", () => {
   const dir = mkdtempSync(join(tmpdir(), "acp-compact-"));
-  const prev = process.env.HOME;
-  process.env.HOME = dir;
   try {
     mkdirSync(join(dir, CONFIG_DIR_NAME), { recursive: true });
     writeFileSync(join(dir, CONFIG_DIR_NAME, "acp.json"), JSON.stringify({ compressModel: "openai:gpt-4o" }));
-    assert.equal(readCompressModel(), "openai:gpt-4o");
+    withHome(dir, () => assert.equal(readCompressModel(), "openai:gpt-4o"));
   } finally {
-    process.env.HOME = prev;
     rmSync(dir, { recursive: true, force: true });
   }
 });
 
 test("readCompressModel ignores empty / non-string compressModel", () => {
   const dir = mkdtempSync(join(tmpdir(), "acp-compact-"));
-  const prev = process.env.HOME;
-  process.env.HOME = dir;
   try {
     mkdirSync(join(dir, CONFIG_DIR_NAME), { recursive: true });
     writeFileSync(join(dir, CONFIG_DIR_NAME, "acp.json"), JSON.stringify({ compressModel: "" }));
-    assert.equal(readCompressModel(), null);
+    withHome(dir, () => assert.equal(readCompressModel(), null));
   } finally {
-    process.env.HOME = prev;
     rmSync(dir, { recursive: true, force: true });
   }
 });