{ "@context": "https://schema.org", "@id": "https://aggr.aymericbeaumet.com/items/hnrss-org/2026-10-29-claude-code-regularly-sends-each-background-agent-s/#webpage", "@type": [ "WebPage", "ArchiveComponent" ], "articleBody": "```js\n// no-agent-summary.js v2: Bun --preload hook that switches off Claude Code's `agent_summary`\n// side-query. Unofficial, not affiliated with Anthropic. Tested on Linux, Claude Code 2.1.301.\n// Install, env vars, verification and fail-open caveats: README.md.\n//\n// SPDX-License-Identifier: MIT\n// Copyright (c) 2026 Flamerix AI (https://flamerix.ai). Provided \"as is\", without warranty;\n// full license text: README.md.\n//\n// Anchors: the summarizer's debug-log line and its query-source id, both inside the timer\n// callback on 2.1.301.\nconst IN_COMPILED_BUN =\n typeof Bun !== \"undefined\" && typeof Bun.main === \"string\" && Bun.main.startsWith(\"/$bunfs/\");\n\nfunction install() {\n const fs = require(\"fs\");\n const ANCHORS = [\"[AgentSummary] Timer fired\", \"agent_summary\"];\n const RAW_MODE = process.env.CC_AGENT_SUMMARY_MODE || \"off\";\n const MODE = RAW_MODE === \"pass\" ? \"pass\" : \"off\";\n if (RAW_MODE !== MODE) process.stderr.write(`[no-agent-summary] unknown mode ${RAW_MODE}, forcing off\\n`);\n const LOG = process.env.CC_AGENT_SUMMARY_LOG;\n const log = (s) => { if (LOG) { try { fs.appendFileSync(LOG, `${new Date().toISOString()} pid=${process.pid} ${s}\\n`); } catch {} } };\n\n const verdict = new WeakMap(); // fn -> bool (is the summary timer callback)\n function isSummaryTimer(fn) {\n if (typeof fn !== \"function\") return false;\n let v = verdict.get(fn);\n if (v === undefined) {\n try {\n const src = Function.prototype.toString.call(fn);\n v = ANCHORS.some((a) => src.includes(a));\n } catch { v = false; }\n verdict.set(fn, v);\n }\n return v;\n }\n\n let matched = 0;\n let suppressed = 0;\n const PROMISIFY = Symbol.for(\"nodejs.util.promisify.custom\");\n const wrappers = new Map(); // original timer fn -> its wrapper: one wrapper per original\n const hookedFns = new WeakSet();\n function wrap(orig, name) {\n if (typeof orig !== \"function\") return orig;\n if (wrappers.has(orig)) return wrappers.get(orig);\n const hooked = function (fn, delay, ...args) {\n if (isSummaryTimer(fn)) {\n matched++;\n if (MODE === \"off\") {\n suppressed++;\n if (matched <= 20) log(`summary timer #${matched} suppressed (${name}, delay=${delay})`);\n const t = orig(() => {}, 2 ** 31 - 1); // clear*-compatible handle of the same kind, never fires\n if (t && typeof t.unref === \"function\") t.unref();\n return t;\n }\n if (matched <= 20) log(`summary timer #${matched} passed (control, ${name}, delay=${delay})`);\n }\n return orig(fn, delay, ...args);\n };\n Object.defineProperty(hooked, \"name\", { value: name });\n // util.promisify(setTimeout) reads these; without the custom one it calls the wrapper\n // callback-last and node throws ERR_INVALID_ARG_TYPE.\n if (orig.__promisify__) hooked.__promisify__ = orig.__promisify__;\n if (orig[PROMISIFY]) hooked[PROMISIFY] = orig[PROMISIFY];\n wrappers.set(orig, hooked);\n hookedFns.add(hooked);\n return hooked;\n }\n\n // require(\"timers/promises\").setTimeout(delay, value) takes no callback, so there is no source\n // to match an anchor in; it stays unwrapped.\n const timers = (() => { try { return require(\"timers\"); } catch { return null; } })();\n const hookedApis = [];\n for (const name of [\"setTimeout\", \"setInterval\"]) {\n globalThis[name] = wrap(globalThis[name], name);\n if (hookedFns.has(globalThis[name])) hookedApis.push(`global.${name}`);\n if (timers) {\n try { timers[name] = wrap(timers[name], name); } catch {}\n if (hookedFns.has(timers[name])) hookedApis.push(`timers.${name}`);\n }\n }\n\n const active = `preload active mode=${MODE} bun=${Bun.version} hooked=${hookedApis.join(\",\")}`;\n log(active);\n if (LOG) process.on(\"exit\", () => log(`exit: ${suppressed} summary timer(s) suppressed, ${matched} matched`));\n const MARKER = process.env.CC_AGENT_SUMMARY_MARKER;\n if (MARKER) {\n try { fs.writeFileSync(MARKER, `${active} pid=${process.pid}\\n`); }\n catch (e) { process.stderr.write(`[no-agent-summary] cannot write marker ${MARKER}: ${e.message}\\n`); }\n }\n}\n\nif (IN_COMPILED_BUN) install();\n```\n", "authors": [ "NikZaal" ], "captured_at": "2026-10-29T08:21:53.512644349+00:00", "category": "news", "content_html": "
// no-agent-summary.js v2: Bun --preload hook that switches off Claude Code's `agent_summary`\n// side-query. Unofficial, not affiliated with Anthropic. Tested on Linux, Claude Code 2.1.301.\n// Install, env vars, verification and fail-open caveats: README.md.\n//\n// SPDX-License-Identifier: MIT\n// Copyright (c) 2026 Flamerix AI (https://flamerix.ai). Provided "as is", without warranty;\n// full license text: README.md.\n//\n// Anchors: the summarizer's debug-log line and its query-source id, both inside the timer\n// callback on 2.1.301.\nconst IN_COMPILED_BUN =\n  typeof Bun !== "undefined" && typeof Bun.main === "string" && Bun.main.startsWith("/$bunfs/");\n\nfunction install() {\n  const fs = require("fs");\n  const ANCHORS = ["[AgentSummary] Timer fired", "agent_summary"];\n  const RAW_MODE = process.env.CC_AGENT_SUMMARY_MODE || "off";\n  const MODE = RAW_MODE === "pass" ? "pass" : "off";\n  if (RAW_MODE !== MODE) process.stderr.write(`[no-agent-summary] unknown mode ${RAW_MODE}, forcing off\\n`);\n  const LOG = process.env.CC_AGENT_SUMMARY_LOG;\n  const log = (s) => { if (LOG) { try { fs.appendFileSync(LOG, `${new Date().toISOString()} pid=${process.pid} ${s}\\n`); } catch {} } };\n\n  const verdict = new WeakMap(); // fn -> bool (is the summary timer callback)\n  function isSummaryTimer(fn) {\n    if (typeof fn !== "function") return false;\n    let v = verdict.get(fn);\n    if (v === undefined) {\n      try {\n        const src = Function.prototype.toString.call(fn);\n        v = ANCHORS.some((a) => src.includes(a));\n      } catch { v = false; }\n      verdict.set(fn, v);\n    }\n    return v;\n  }\n\n  let matched = 0;\n  let suppressed = 0;\n  const PROMISIFY = Symbol.for("nodejs.util.promisify.custom");\n  const wrappers = new Map(); // original timer fn -> its wrapper: one wrapper per original\n  const hookedFns = new WeakSet();\n  function wrap(orig, name) {\n    if (typeof orig !== "function") return orig;\n    if (wrappers.has(orig)) return wrappers.get(orig);\n    const hooked = function (fn, delay, ...args) {\n      if (isSummaryTimer(fn)) {\n        matched++;\n        if (MODE === "off") {\n          suppressed++;\n          if (matched <= 20) log(`summary timer #${matched} suppressed (${name}, delay=${delay})`);\n          const t = orig(() => {}, 2 ** 31 - 1); // clear*-compatible handle of the same kind, never fires\n          if (t && typeof t.unref === "function") t.unref();\n          return t;\n        }\n        if (matched <= 20) log(`summary timer #${matched} passed (control, ${name}, delay=${delay})`);\n      }\n      return orig(fn, delay, ...args);\n    };\n    Object.defineProperty(hooked, "name", { value: name });\n    // util.promisify(setTimeout) reads these; without the custom one it calls the wrapper\n    // callback-last and node throws ERR_INVALID_ARG_TYPE.\n    if (orig.__promisify__) hooked.__promisify__ = orig.__promisify__;\n    if (orig[PROMISIFY]) hooked[PROMISIFY] = orig[PROMISIFY];\n    wrappers.set(orig, hooked);\n    hookedFns.add(hooked);\n    return hooked;\n  }\n\n  // require("timers/promises").setTimeout(delay, value) takes no callback, so there is no source\n  // to match an anchor in; it stays unwrapped.\n  const timers = (() => { try { return require("timers"); } catch { return null; } })();\n  const hookedApis = [];\n  for (const name of ["setTimeout", "setInterval"]) {\n    globalThis[name] = wrap(globalThis[name], name);\n    if (hookedFns.has(globalThis[name])) hookedApis.push(`global.${name}`);\n    if (timers) {\n      try { timers[name] = wrap(timers[name], name); } catch {}\n      if (hookedFns.has(timers[name])) hookedApis.push(`timers.${name}`);\n    }\n  }\n\n  const active = `preload active mode=${MODE} bun=${Bun.version} hooked=${hookedApis.join(",")}`;\n  log(active);\n  if (LOG) process.on("exit", () => log(`exit: ${suppressed} summary timer(s) suppressed, ${matched} matched`));\n  const MARKER = process.env.CC_AGENT_SUMMARY_MARKER;\n  if (MARKER) {\n    try { fs.writeFileSync(MARKER, `${active} pid=${process.pid}\\n`); }\n    catch (e) { process.stderr.write(`[no-agent-summary] cannot write marker ${MARKER}: ${e.message}\\n`); }\n  }\n}\n\nif (IN_COMPILED_BUN) install();\n
\n", "content_markdown": "```js\n// no-agent-summary.js v2: Bun --preload hook that switches off Claude Code's `agent_summary`\n// side-query. Unofficial, not affiliated with Anthropic. Tested on Linux, Claude Code 2.1.301.\n// Install, env vars, verification and fail-open caveats: README.md.\n//\n// SPDX-License-Identifier: MIT\n// Copyright (c) 2026 Flamerix AI (https://flamerix.ai). Provided \"as is\", without warranty;\n// full license text: README.md.\n//\n// Anchors: the summarizer's debug-log line and its query-source id, both inside the timer\n// callback on 2.1.301.\nconst IN_COMPILED_BUN =\n typeof Bun !== \"undefined\" && typeof Bun.main === \"string\" && Bun.main.startsWith(\"/$bunfs/\");\n\nfunction install() {\n const fs = require(\"fs\");\n const ANCHORS = [\"[AgentSummary] Timer fired\", \"agent_summary\"];\n const RAW_MODE = process.env.CC_AGENT_SUMMARY_MODE || \"off\";\n const MODE = RAW_MODE === \"pass\" ? \"pass\" : \"off\";\n if (RAW_MODE !== MODE) process.stderr.write(`[no-agent-summary] unknown mode ${RAW_MODE}, forcing off\\n`);\n const LOG = process.env.CC_AGENT_SUMMARY_LOG;\n const log = (s) => { if (LOG) { try { fs.appendFileSync(LOG, `${new Date().toISOString()} pid=${process.pid} ${s}\\n`); } catch {} } };\n\n const verdict = new WeakMap(); // fn -> bool (is the summary timer callback)\n function isSummaryTimer(fn) {\n if (typeof fn !== \"function\") return false;\n let v = verdict.get(fn);\n if (v === undefined) {\n try {\n const src = Function.prototype.toString.call(fn);\n v = ANCHORS.some((a) => src.includes(a));\n } catch { v = false; }\n verdict.set(fn, v);\n }\n return v;\n }\n\n let matched = 0;\n let suppressed = 0;\n const PROMISIFY = Symbol.for(\"nodejs.util.promisify.custom\");\n const wrappers = new Map(); // original timer fn -> its wrapper: one wrapper per original\n const hookedFns = new WeakSet();\n function wrap(orig, name) {\n if (typeof orig !== \"function\") return orig;\n if (wrappers.has(orig)) return wrappers.get(orig);\n const hooked = function (fn, delay, ...args) {\n if (isSummaryTimer(fn)) {\n matched++;\n if (MODE === \"off\") {\n suppressed++;\n if (matched <= 20) log(`summary timer #${matched} suppressed (${name}, delay=${delay})`);\n const t = orig(() => {}, 2 ** 31 - 1); // clear*-compatible handle of the same kind, never fires\n if (t && typeof t.unref === \"function\") t.unref();\n return t;\n }\n if (matched <= 20) log(`summary timer #${matched} passed (control, ${name}, delay=${delay})`);\n }\n return orig(fn, delay, ...args);\n };\n Object.defineProperty(hooked, \"name\", { value: name });\n // util.promisify(setTimeout) reads these; without the custom one it calls the wrapper\n // callback-last and node throws ERR_INVALID_ARG_TYPE.\n if (orig.__promisify__) hooked.__promisify__ = orig.__promisify__;\n if (orig[PROMISIFY]) hooked[PROMISIFY] = orig[PROMISIFY];\n wrappers.set(orig, hooked);\n hookedFns.add(hooked);\n return hooked;\n }\n\n // require(\"timers/promises\").setTimeout(delay, value) takes no callback, so there is no source\n // to match an anchor in; it stays unwrapped.\n const timers = (() => { try { return require(\"timers\"); } catch { return null; } })();\n const hookedApis = [];\n for (const name of [\"setTimeout\", \"setInterval\"]) {\n globalThis[name] = wrap(globalThis[name], name);\n if (hookedFns.has(globalThis[name])) hookedApis.push(`global.${name}`);\n if (timers) {\n try { timers[name] = wrap(timers[name], name); } catch {}\n if (hookedFns.has(timers[name])) hookedApis.push(`timers.${name}`);\n }\n }\n\n const active = `preload active mode=${MODE} bun=${Bun.version} hooked=${hookedApis.join(\",\")}`;\n log(active);\n if (LOG) process.on(\"exit\", () => log(`exit: ${suppressed} summary timer(s) suppressed, ${matched} matched`));\n const MARKER = process.env.CC_AGENT_SUMMARY_MARKER;\n if (MARKER) {\n try { fs.writeFileSync(MARKER, `${active} pid=${process.pid}\\n`); }\n catch (e) { process.stderr.write(`[no-agent-summary] cannot write marker ${MARKER}: ${e.message}\\n`); }\n }\n}\n\nif (IN_COMPILED_BUN) install();\n```\n", "dateCreated": "2026-10-29T08:21:53.512644349+00:00", "date_created": "2026-10-29T03:33:42+00:00", "date_modified": "2026-10-29T03:33:42+00:00", "date_published": "2026-10-29T03:33:42+00:00", "description": "// no-agent-summary.js v2: Bun --preload hook that switches off Claude Code's `agent_summary` // side-query. Unofficial, not affiliated with Anthropic. Tested on Linux, Claude Code 2.1.301. // Install, env vars, verification and fail-open…", "external_url": "https://gist.github.com/flamerix-ai/c3905705cc4205e5de3011fa2e74efce", "git": { "commit": "20068632b65d2830a2d54f25ca1d90d697bea2c0", "path": "items/hnrss-org/2026/10/2026-10-29-claude-code-regularly-sends-each-background-agent-s.md", "permalink": "https://github.com/aymericbeaumet/aggr-instance/blob/20068632b65d2830a2d54f25ca1d90d697bea2c0/items/hnrss-org/2026/10/2026-10-29-claude-code-regularly-sends-each-background-agent-s.md" }, "id": "urn:aggr:item:ef86df45bfb991f50c160fc9301be6d432f03aff", "isBasedOn": { "@id": "https://gist.github.com/flamerix-ai/c3905705cc4205e5de3011fa2e74efce" }, "mainEntity": { "@id": "https://gist.github.com/flamerix-ai/c3905705cc4205e5de3011fa2e74efce", "@type": "CreativeWork", "archivedAt": { "@id": "https://aggr.aymericbeaumet.com/items/hnrss-org/2026-10-29-claude-code-regularly-sends-each-background-agent-s/#webpage" }, "author": [ { "@type": "Person", "name": "NikZaal" } ], "dateModified": "2026-10-29T03:33:42+00:00", "datePublished": "2026-10-29T03:33:42+00:00", "headline": "Claude Code regularly sends each background agent’s transcript to its model", "image": { "@type": "ImageObject", "caption": "Claude Code burns ~15-20% of your tokens on a 3-word status line: a Bun preload that turns agent_summary off · by Flamerix AI, flamerix.ai · MIT - README.md", "height": 90, "url": "https://github.githubassets.com/assets/gist-og-image-54fd7dc0713e.png", "width": 160 }, "timeRequired": "PT3M", "url": "https://gist.github.com/flamerix-ai/c3905705cc4205e5de3011fa2e74efce", "wordCount": 455 }, "name": "Archived snapshot: Claude Code regularly sends each background agent’s transcript to its model", "preview": { "alt": "Claude Code burns ~15-20% of your tokens on a 3-word status line: a Bun preload that turns agent_summary off · by Flamerix AI, flamerix.ai · MIT - README.md", "color": null, "height": 90, "placeholder": { "data_url": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=", "hash": "" }, "url": "https://github.githubassets.com/assets/gist-og-image-54fd7dc0713e.png", "width": 160 }, "reading_minutes": 3, "replicated_at": null, "source": "hnrss-org", "source_name": "Hacker News: Front Page", "summary": null, "tags": [], "temporalCoverage": "2026-10-29T08:21:53.512644349+00:00", "title": "Claude Code regularly sends each background agent’s transcript to its model", "url": "https://aggr.aymericbeaumet.com/items/hnrss-org/2026-10-29-claude-code-regularly-sends-each-background-agent-s/", "word_count": 455 }