fix: strip model-emitted bili internal artifacts from prose streams

src/codex-compact.ts

@@ -67,6 +67,11 @@ export function extractBiliSummary(item: unknown): string | undefined {
     return text.length > 0 ? text : undefined;
 }
 
+/** User-role handoff prefix for a client-echoed compaction item (#1106/#1113).
+ *  Exported so the output-side echo guard derives its line head from this same
+ *  constant — guard and carrier share one identifier (#1635). */
+export const COMPACT_ECHO_PREFIX = "[bili] context summary after compaction:";
+
 // An echoed fc_bili_ compaction item is REPLACED (in place) by a plain user
 // message carrying the extracted summary — a history-borne handoff the kernel
 // can fold again and codex's retention keeps. Rare bounded duplication (a
@@ -91,7 +96,7 @@ export function replaceBiliCompactionItems<T>(input: T[]): { items: T[]; replace
         items.push({
             type: "message",
             role: "user",
-            content: [{ type: "input_text", text: `[bili] context summary after compaction:\n${summary}` }],
+            content: [{ type: "input_text", text: `${COMPACT_ECHO_PREFIX}\n${summary}` }],
         } as T);
         replaced++;
     }
@@ -150,7 +155,9 @@ export function buildTriggerForgeBody(
 // The kernel renders block summaries as system messages with this header
 // (acp-kernel SUMMARY_HEADER). Reuse the exact format so the model reads a
 // captured handoff summary the same way it reads a live kernel-rendered one.
-const FORGED_SUMMARY_HEADER = "[Compressed conversation section]";
+// Exported: the output-side echo guard derives its line head from this same
+// constant so guard and carrier share one identifier (#1635).
+export const FORGED_SUMMARY_HEADER = "[Compressed conversation section]";
 
 export function renderForgedSummary(block: Pick<CompressionBlock, "summary" | "topic">): string {
     const body = block.summary.trim();

src/loop/adapter-anthropic.ts

@@ -2,7 +2,7 @@ import type { CoreMessage } from "acp-kernel";
 import { coreToAnthropic, extractSystem, buildSystem, type AnthropicRequestBody } from "acp-kernel/wire";
 import { stampAnthropicSystemCacheControl } from "./cache-control.js";
 import { buildVisibilityMarker } from "./core.js";
-import { composeStreamFilters, createMarkerLineFilter, createTagEchoFilter } from "./tag-echo-filter.js";
+import { composeStreamFilters, createBiliChainTagFilter, createInternalArtifactLineFilter, createMarkerLineFilter, createTagEchoFilter } from "./tag-echo-filter.js";
 import { degenerateTurnWarning } from "../degenerate-turn.js";
 import { log as loggerLog } from "../logger.js";
 import type {
@@ -270,6 +270,12 @@ export function createAnthropicAdapter(requestBody: Record<string, unknown>, ori
                 createMarkerLineFilter((snippet) => {
                     loggerLog("warn", `[marker-echo] stripped model-emitted ACP confirmation marker: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
                 }),
+                createBiliChainTagFilter((snippet) => {
+                    loggerLog("warn", `[bili-chain-echo] stripped model-emitted chain checkpoint tag: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
+                }),
+                createInternalArtifactLineFilter((snippet) => {
+                    loggerLog("warn", `[artifact-echo] stripped model-emitted internal summary artifact line: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
+                }),
             );
             let lastTextIndex: number | null = null;
             let sawThinking = false;

src/loop/adapter-google.ts

@@ -2,7 +2,7 @@ import type { CoreMessage } from "acp-kernel";
 import { coreToGoogle } from "acp-kernel/wire";
 import type { GooglePart } from "acp-kernel/wire";
 import { buildVisibilityMarker } from "./core.js";
-import { composeStreamFilters, createMarkerLineFilter, createTagEchoFilter } from "./tag-echo-filter.js";
+import { composeStreamFilters, createBiliChainTagFilter, createInternalArtifactLineFilter, createMarkerLineFilter, createTagEchoFilter } from "./tag-echo-filter.js";
 import { degenerateTurnWarning } from "../degenerate-turn.js";
 import { log as loggerLog } from "../logger.js";
 
@@ -294,6 +294,12 @@ export function createGoogleAdapter(
                 createMarkerLineFilter((snippet) => {
                     loggerLog("warn", `[marker-echo] stripped model-emitted ACP confirmation marker: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
                 }),
+                createBiliChainTagFilter((snippet) => {
+                    loggerLog("warn", `[bili-chain-echo] stripped model-emitted chain checkpoint tag: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
+                }),
+                createInternalArtifactLineFilter((snippet) => {
+                    loggerLog("warn", `[artifact-echo] stripped model-emitted internal summary artifact line: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
+                }),
             );
             const flushFilter = function* (): Generator<ParsedStreamEvent> {
                 const tail = tagFilter.flush();

src/loop/adapter-openai.ts

@@ -1,7 +1,7 @@
 import type { CoreMessage } from "acp-kernel";
 import { coreToOpenai, injectOpenaiSystem } from "acp-kernel/wire";
 import { buildVisibilityMarker } from "./core.js";
-import { composeStreamFilters, createMarkerLineFilter, createTagEchoFilter } from "./tag-echo-filter.js";
+import { composeStreamFilters, createBiliChainTagFilter, createInternalArtifactLineFilter, createMarkerLineFilter, createTagEchoFilter } from "./tag-echo-filter.js";
 import { degenerateTurnWarning } from "../degenerate-turn.js";
 import { log as loggerLog } from "../logger.js";
 import { hardenOpenaiAssistantContent, systemToUser } from "../util.js";
@@ -224,6 +224,12 @@ export function createOpenaiAdapter(requestBody: Record<string, unknown>, client
                 createMarkerLineFilter((snippet) => {
                     loggerLog("warn", `[marker-echo] stripped model-emitted ACP confirmation marker: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
                 }),
+                createBiliChainTagFilter((snippet) => {
+                    loggerLog("warn", `[bili-chain-echo] stripped model-emitted chain checkpoint tag: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
+                }),
+                createInternalArtifactLineFilter((snippet) => {
+                    loggerLog("warn", `[artifact-echo] stripped model-emitted internal summary artifact line: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
+                }),
             );
             const flushFilter = function* (): Generator<ParsedStreamEvent> {
                 const tail = tagFilter.flush();

src/loop/adapter-responses.ts

@@ -4,7 +4,7 @@ import { coreToResponsesWithToolImages as coreToResponses, patchResponsesInputWi
 import { buildVisibilityMarker } from "./core.js";
 import { hoistTrappedToolItems } from "../tool-pair-order.js";
 import { hashId } from "../util.js";
-import { composeStreamFilters, createMarkerLineFilter, createTagEchoFilter, stripResponsesText, containsMarkerLineText, containsRenderTagText, ACP_NAME_ALT } from "./tag-echo-filter.js";
+import { composeStreamFilters, createBiliChainTagFilter, createInternalArtifactLineFilter, createMarkerLineFilter, createTagEchoFilter, stripResponsesText, containsMarkerLineText, containsRenderTagText, ACP_NAME_ALT } from "./tag-echo-filter.js";
 import { degenerateTurnWarning } from "../degenerate-turn.js";
 import { log as loggerLog } from "../logger.js";
 import { extractResponsesTextTriggers, PROXY_TOOL_NAMES } from "../compress-tool.js";
@@ -340,6 +340,12 @@ export function createResponsesAdapter(textProtocol?: boolean, projection?: Resp
                 createMarkerLineFilter((snippet) => {
                     loggerLog("warn", `[marker-echo] stripped model-emitted ACP confirmation marker: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
                 }),
+                createBiliChainTagFilter((snippet) => {
+                    loggerLog("warn", `[bili-chain-echo] stripped model-emitted chain checkpoint tag: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
+                }),
+                createInternalArtifactLineFilter((snippet) => {
+                    loggerLog("warn", `[artifact-echo] stripped model-emitted internal summary artifact line: ${snippet.slice(0, 80).replace(/\n/g, " ")}`);
+                }),
             );
             let lastTextRef: { itemId: string; outputIndex: number } | null = null;
             const flushFilter = function* (): Generator<ParsedStreamEvent> {