Forkcaster

xyz.forkcaster由 forkcaster.xyz 发布官方发布者v1.0.0更新于 Oct 29, 2026

Resolve Farcaster casts to deep-link URLs for any supported Farcaster client app. No auth.

已验证Streamable HTTP可网页运行网页搜索与抓取沟通与协作

概览

AI 生成的概览

Forkcaster 的公开 MCP 端点，把 Farcaster 帖子引用解析成可在受支持 Farcaster 客户端中打开的深链 URL。

可以做什么
  • 用用户名或 fid 加短哈希，或用完整 40 位十六进制哈希解析帖子
  • 返回在指定目标客户端中打开该帖子的 URL，或返回所有受支持客户端的链接
  • 报告作者是否已接受签名社交合约，未签名作者的链接仍会返回
  • 对仅支持含外链帖子的客户端做资格判断，不满足时返回不符合条件
适用场景
当助手需要给用户一个可直接打开的 Farcaster 帖子链接，或需要比较哪些客户端能打开该帖子，而用户没有安装 Farcaster 应用时适用。
运行要求
远程 Streamable HTTP 端点 forkcaster.xyz/mcp；未声明任何认证、API 密钥或环境变量。需要能访问该端点的网络。
安装前请注意
该端点公开且无认证，任何人都可调用。每次请求都会从第三方 Farcaster 数据源解析，结果取决于这些数据源是否可用；数据源故障时可能只返回链接或返回错误。签名状态会被报告，但无论是否签名都会返回链接，且部分客户端会隐藏未签名作者。

安装

在 SourceWeft 中

  1. 打开 控制台中的 Forkcaster，将其添加到工作区。
  2. 为需要使用其工具的对话启用该服务。

Web executable，通过 Streamable HTTP。 远程服务在工作区中配置后即可从网页运行时运行。

交给智能体安装

把这段提示词粘贴到 Claude Code、Codex、Cursor 等智能体，或 SourceWeft 对话中。智能体会读取该服务器的安装指南，先向你展示发布者、端点和登录方式，经你同意后再把它添加到你的客户端。密钥不会写进任何命令。

阅读 https://sourceweft.com/mcp/xyz.forkcaster%2Fmcp/install.md，并按其中说明把这个 MCP 服务器接入我的客户端。修改任何配置之前，先告诉我它的发布者、端点和登录方式，等我确认。不要把 API 密钥写进命令或我会提交的文件；问我密钥应从哪里获取。

查看智能体所依据的安装指南

其他 MCP 客户端

把它添加到你客户端的 mcpServers 配置中。

{
  "mcpServers": {
    "forkcaster": {
      "type": "http",
      "url": "https://forkcaster.xyz/mcp"
    }
  }
}

README

forkcaster — agent brief

Audience: coding agents. Prefer facts over prose. Update this file when architecture or commands change.

Intent

Micro-site that mirrors Farcaster cast URLs for sharing without the Farcaster app.

  • Pattern: /{username}/{castHash} where castHash matches 0x[0-9a-fA-F]+ — short or full form
  • Examples: /zoo/0x895ecc74 and /decent-artlu/0xbb54368f → SSR cast card + links
  • Data: raced across a fleet of sources (worker/cast-source.ts + worker/shim.ts on the shared worker/race.ts kernel) — see "Cast source race" below. shim (https://shim.artlu.xyz/wc/{username}/{hash}, owner-run Snapchain reader with a keep-warm cron) anchors completeness and hosts the ban-signal read (/signed/{fid} — fleet-raced like every shim read); farcaster.tv is fast but quote-blind; raw nodes haatz/snap.farcaster.xyz:3381 are embed-complete but text-blind (the gateway strips the mention placeholder characters from text — shim owns the @username substitution — so mention-bearing raw wins are held until canonical text settles or is proven unavailable) and get the fid by racing the shim fleet's /f/{username} against their own /v1/userNameProofByName (first numeric answer wins, loser aborted; the shim-side winner is labeled with its fleet member id), plus a full hash requirement (castById 400s on short hashes). All upstream calls are capped at 5s.
  • Missing cast: a consensus miss — every miss-authoritative source consulted and missed — ⇒ 404 page; every source errored ⇒ link-only page (200). No single source's miss is a verdict. All upstream calls are capped at 5s (AbortSignal.timeout) — shim's cold sharded lookups can otherwise hang 15s+; timeout ⇒ unreachable. Strict statuses are the JSON variant's job (see below)
  • Banned accounts: embeds render for everyone — but some clients hide unsigned authors. Since Oct 15, 2026 (Network School takeover), accounts must accept the "social smart contract" (Network Code); acceptance is an on-chain access NFT. Shim exposes it: GET https://shim.artlu.xyz/signed/{fid} → {"signed":true|false}. Unsigned authors: registry clients flagged requiresSigned (e.g. farcaster) are suppressed from the action row; the check fails open — unknown state suppresses nothing
  • farcaster.tv as a cast data source is quote-blind (it drops {castId} embeds) and unofficial — it races as the partial tier only (700ms HTML box, client-side quote fill-in). react-farcaster-embed's own default endpoint is farcaster.tv — always pass castData so it never fetches. The live stats row (replies/recasts/likes) is still fetched client-side from farcaster.tv — it sends access-control-allow-origin: * and answers for unsigned authors too; any failure just leaves the row absent

Architecture

The system is a waypoint layer over Farcaster: every public URL shape maps to exactly one canonical surface, and every page answers one question — which app opens this? There is no database, no KV, and no edge cache on this side — data is raced across a fleet of sources on every request. The product is the routing verdict, not stored content.

Cloudflare Worker (Hono; dual-domain; registration-order routing)├─ routes: cast · profile · casts-page · aliases · mcp · /transparency · /api · /t├─ RESOLUTION KERNEL — worker/race.ts│    staggerDelays · collectTerminals · collectiveRace│    ├─ raceShimProbe — every shim-shaped read (profiles, quotes, signed,│    │                  aliases, MCP): cloud + the potato fleet│    └─ raceCast — provider roster (shim ∥ potatos ∥ haatz ∥ snap ∥│                  farcaster.tv) + completeness box + race telemetry├─ SOURCES: shim (cloud) · potato fleet (replicas) · haatz/snap (raw│   nodes) · farcaster.tv (partial, quote-blind)├─ RENDERERS: resolve once, render twice — SSR HTML + strict JSON twin├─ STATEFUL LAYER: fc_client cookie → last-used badge, auto-open, pill│   order (client-side writes; the server only reads)└─ TELEMETRY: one anonymous Analytics Engine datapoint per resolve →     offline snapshots → /transparency

Verdicts are collective — no single host is the source of truth. Fleet legs start staggered (tiny random steps behind the leader; a fast winner cancels the stragglers before they fire). The first affirmative answer wins; a consulted miss (asked, no data) is a vote — not-found settles only when every miss-authoritative leg has consulted and missed; errors surface only when every leg errored. Any one host — including cloud shim — can die without changing a single verdict. The price is deliberate: a true miss resolves as fast as the slowest leg, not the fastest.

Consumer-matched strictness. HTML fails open — a human always gets a page (found → card, partial → self-healing card, unreachable → link-only). JSON is the strict record (404 / 503 + Retry-After, availability-gated fields, quotes never dropped). Chat link-preview bots get HTML + OG meta unconditionally: negotiation is ?format=json / Accept, never UA sniffing, and SSR output is byte-identical for every device.

Design laws (enforced everywhere; detail in the sections below):

  • Waypoint law — one surface per account; aliases redirect, never render.
  • Identity law — the fname is the PRIMARY handle everywhere; ENS names are attestations.
  • Echo-the-valid-input — first-party links carry the gate-validated route input; display, OG, and client targets carry the primary.
  • Privacy: no identifiable tracking, only analytics. One anonymous click datapoint per client selection; the negative list (no cast IDs, no usernames, no IPs, no UA strings, no identifiers) is verbatim-checkable in worker/track.ts and declared on /transparency. Pages make no third-party requests — logos are self-hosted because a hotlinked logo would leak every visitor's IP to that client's servers. The one cookie carries a client slug, nothing else.
  • Personalization is client-side on cast pages. The page shell (the client sheet's pills included, gates applied) is cookie-blind server-side; SHELL_SCRIPT reads the local fc_client cookie and applies the last-used badge, the resolution-first primary ("Open in X" — a direct anchor with the pill's exact wiring — beside a muted "More apps" sheet trigger), and the auto-open state machine after parse (the sheet's auto-open toggle syncs from the same cookie). That is what makes the full page — cookie-holders included — servable from the 12h edge shell; profiles cache 10 minutes (they are mutable) under the same client-side model. Bump SHELL_SALT in worker/edge-cache.ts to invalidate every shell (there is no global purge; v3 dropped the pre-sheet UI — bare pill row + on-page auto-open chip; v4 reached cached shells with the Safari-safe sheet CSS; v5 reached them with the kind-aware chooser copy and single-offer bare-row shape).
  • Registry as the one roster — clients and their verification provenance are enumerated exactly once, in worker/client-registry.ts.

Stack

LayerChoiceNotes
Runtime / package mgrBunlockfile: bun.lock; scripts use bun run
UI (landing)Preact 11SPA assets; entry src/main.tsx
Cast pagesHono on Cloudflare WorkerSSR in worker/
Cast dataProvider race (cast-source.ts)shim ∥ farcaster.tv ∥ haatz ∥ snap ∥ shim-potato fleet — first validated win; completeness box for HTML, complete-leg fleet roster for JSON; see "Cast source race" below
URL embed cardsunfurl.artlu.workers.devcalled via the UNFURL service binding (workers.dev→workers.dev fetch is blocked, CF error 1042); GET /?u={url} → OG title/description/image (cached, fails open to hostname-only)
Cast embedreact-farcaster-embedrendering only — castData always supplied, never fetches
Live statsclient-side script → farcaster.tvLIVE_STATS_SCRIPT in cast-scripts.ts; fills the SSR-stripped stats slot from the browser; fails silent (row absent); the SSR data path is fleet-raced server-side
SSRpreact-render-to-stringafter await FarcasterEmbed({ castData })
BundlerVite 8@preact/preset-vite + @cloudflare/vite-plugin
LintBiomebun run lint
Typecheckbun checktsc-compatible, built into Bun; no typescript pkg
Testsbun:testbun test (cast route + client registry)

Commands

sh
bun installbun run dev          # wrangler dev (local worker + assets)bun run build        # vite build → dist/bun run typecheck    # bun check (tsc-compatible; reads tsconfig*.json)bun run deploy       # build + wrangler deploybun run lint         # biome lint .bun test             # worker tests (cast route + client registry)bun run cf-typegen   # wrangler types → worker-configuration.d.ts

Layout

/├── index.html                 # SPA shell → /src/main.tsx├── vite.config.ts             # preact + cloudflare + react→preact aliases├── wrangler.jsonc             # main=worker/index.ts; not_found_handling=none├── public/farcaster-embed.css # linked from SSR HTML├── public/logos/              # per-client marks for the action row├── quilcast-router-shortcut.md # the iOS/macOS share-sheet router: mapping, build/sign, distribution├── shortcuts/                 # generated .shortcut artifact (unsigned; `bun run shortcut:quilcast`)├── worker/│   ├── index.ts               # Hono app; export { app }; default { fetch }│   ├── client-registry.ts     # client registry (verified templates; zero-dep, vendored-able)│   ├── clients.ts             # fc_client cookie binding (last-used + auto-open prefs)│   ├── shim.ts                # shim identity client (routes, ShimCast/ShimUser, /wc /h /f /u /user /casts-and-replies /signed, /refresh as the index warmer; fleetBases parses the fleet var)│   ├── race.ts                # fleet-race kernel: RaceLeg, staggerDelays, collectTerminals, collectiveRace — shared by cast-source + shim│   ├── cast-source.ts         # provider race: shim ∥ potato fleet ∥ haatz ∥ snap ∥ farcaster.tv (+ the /~/{hash} hash-only rescue); fleet stagger + collective miss parity│   ├── cast-page.tsx          # resolve (race) → render orchestration: SSR / 404 / link fallback│   ├── cast-data.ts           # pure Shim → embed-data mapping + embed helpers│   ├── cast-actions.tsx       # client sheet — chooser shapes (single-offer bare row / trigger + dialog), pills byte-identical inside│   ├── cast-scripts.ts        # inline client scripts (TRACK/CLIENT/DEEPLINK/AUTO/LIVE_STATS/QUOTE_FILL)│   ├── profile-page.tsx       # profile landings: resolve-once/render-twice, waypoint law│   ├── warpcast.ts            # Warpcast channel API client (zod contract; /v1/channel — keyless, first-party)│   ├── channel-page.tsx       # channel landings: resolve-once/render-twice, waypoint law│   ├── shell.tsx              # shared page frame (head/meta/CSS/footer) — cast pages + profiles + /transparency│   ├── cast-ref.ts            # MCP cast-ref: zod contract + shim-direct resolution│   ├── mcp.ts                 # MCP SDK v2 server factory (get_cast_link) — only SDK import site│   ├── cast-route.test.ts     # bun:test; mock.module + exact-URL fetch mock│   ├── clients.test.ts        # registry unit tests: templates, gating, signed rule, deeplinks│   ├── cast-source.test.ts    # race unit tests: eligibility, box, miss/error, abort, adapter mapping│   ├── race-stats-store.ts    # lmdis snapshot read-through TTL cache (10min TTL / stale 24h / 2s cap)│   ├── fid-race-store.ts      # mirror of the above for the "Author id races" snapshot (key fid-race)│   ├── vendor/lmdis-sdk.ts    # vendored lmdis SDK (Upstash-shaped seam; get/set only)│   └── shims/server-only.ts   # empty stub for Next.js marker package├── scripts/│   ├── race-stats.ts          # offline stats job: AE SQL → snapshot → lmdis (dotenvx env; --dry)│   ├── race-stats-lib.ts      # pure query builders (fixture-tested)│   ├── fid-race.ts            # offline fid-race job: FID_RACE AE SQL → snapshot → lmdis (mirror of race-stats.ts)│   ├── fid-race-lib.ts        # pure fid-race query builders (fixture-tested)│   ├── client-rank.ts         # offline rank job: CLICK_STATS AE SQL → weighted snapshot → lmdis│   ├── client-rank-lib.ts     # pure query builders + weighting (fixture-tested)│   ├── stats-alert.ts         # ntfy threshold alerter over the live lmdis snapshots (`stats:check`; --dry)│   ├── quilcast-shortcut.ts   # generates the quilcast → share-sheet shortcut (mapping in quilcast-router-shortcut.md)│   └── probe/                 # live-service probes (lmdis, AE SQL, shim timing)└── src/                       # landing only (App.tsx)

Routes

PathHandlerResponse
/static asset index.htmllanding SPA
/api/Honoagent-facing index: the JSON surfaces this worker serves (cast, profile, channel, raceStats, transparency)
/prefsHonoPOST JSON { auto?: "on" | "off", delay?: 0–5 } (at least one field) → 204 + Set-Cookie (fc_client); delay omitted from the cookie at the default 5s. Auto-open preference write (server cookie — Safari ITP exemption)
/tHonoPOST beacon (one per client selection): { c: slug, k: pill|auto|go-now, t?: web|native, d?: coarse|fine, f?: first|switch|repeat } → 204 always (invalid = dropped, indistinguishable). Allow-listed against the active registry; one anonymous CLICK_STATS datapoint — no cast IDs, no IPs, no identifiers
/transparencyHonoHTML facts page (what/data/tracking/domains — Domains carries registration expiry + RDAP confirm links — plus race-stats and client-rank tables filled server-side from lmdis snapshots, "stats as of" lines, and the registry-driven Client coverage matrix — clients × route kinds, straight from targetFor) or JSON twin via ?format=json/Accept (racingStats.status/clientRank.status: live | coming-soon; clients lists per-kind coverage); reserved exact path — cast URLs for a username named transparency still work
/race-stats.jsonHonoraw stats snapshot (same cached read as /transparency); 404 when absent; cache-control: public, max-age=21600
/mcpHono → MCP SDK v2MCP Streamable HTTP endpoint (POST JSON-RPC; public, no auth). One tool, get_cast_link: cast reference (longhash ∥ fid+shorthash ∥ username+shorthash) + target client → client URLs + author signed status; farcaster.xyz is the canonical surface.
/:username/:hash (0x…)Hono SSRHTML: 200 cast card + OG/Twitter meta (title = DisplayName (@primary) — identity law: the fname is the author handle everywhere on the page (og, canonical/og:url path, embed links, stats slot; ENS names are attestations, profile-only), legacy casts without fname degrade to the newest-proof username, description = whitespace-collapsed cast text, 280 chars, image = first image embed else avatar; summary_large_image card only when the image is a cast embed image; og:site_name = forkcaster) + registry-driven client action row (see "Client registry" below); unsigned author (/signed/{fid} false): requiresSigned clients (e.g. farcaster) suppressed, the embed's Show-on-Farcaster icon hidden (the library's hideFarcasterLogo — the farcaster.xyz page is dead for them, a local twin would self-link) and its stats slot flagged so client-built links go to the local waypoint; 404 when the fleet consensus is no-such-cast; 200 link-only when every source is unreachable
/:username/:hash?format=json (or Accept: application/json)Hono JSONStrict-status agent variant — see "Agent JSON variant" below
/:usernameHono SSRProfile landing (waypoint law, strict dial: the identity card IS the page): the hydrated shim /user/{fid} entity (displayName/pfp/bio/fid — bio collapses with explicit http(s) URLs linkified (new tab, noopener; mentions/#channels stay inert), primaryAddress as truncated <code> that is itself the Basescan link (new window) + copy button) + a "Casts and replies" pill; no cast list — the list lives on /:username/casts-and-replies; the way out is the STATEFUL menu: registry-driven pills (rank-ordered, data-client, badge on the flat resolution — own p: cookie slug else the cast slug), auto-open banner/overlay from the same resolution (last-used cookie; ?noredirect=1 supported), telemetry beacons on clicks; unsigned accounts (/signed/{fid} false, null fails open) get farcaster suppressed (requiresSigned on the kind target) + the read-only notice — Quilcast (/u/ route) + Quorum (source-verified profile deep link) remain via the registry; JSON twin stays cookie-free; OG meta (og:type profile, twitter:card summary, image = pfp); single segment registered LAST — reserved exact routes and the two-segment cast route win by registration order; trailing-slash forms (/{username}/, /{username}/casts-and-replies/) 301 to the canonical non-slash URLs (query preserved); charset gate + bot-path denylist 404 without upstream calls; 404 on a fleet-wide /f miss (or sparse /user shape), 503 + Retry-After when every source is unreachable; the HTML path skips the timeline call entirely; echo-the-valid-input: first-party links (the pill) carry the gate-validated route input — shim resolves any resolvable alias (fname/ENS/basename) to the same fid, and /user/{fid} answers the NEWEST username proof, which can differ from what was typed — while display, OG/canonical, and external client targets carry the PRIMARY handle (identity law: the fname — the account's first name — is primary; ENS names are attestations, rendered bold-primary + muted parens on the card @arfonzo (arfonzo.eth, …), capped at 3, and listed uncapped in the JSON; legacy entities without fname degrade to the newest-proof username)
/:username?format=json (or Accept: application/json)Hono JSONStrict-status profile twin: { username, fid, attestations?, displayName?, bio?, pfp?, primaryAddress?, casts?: [{ hash, text?, timestamp, url }], note? } — username is the PRIMARY handle (the fname; identity law), attestations lists every verified ENS name uncapped when known — 404 / 503 + Retry-After like the cast JSON; listed in /api/
/:username/casts-and-repliesHono SSRThe ONE list surface (farcaster.xyz URL-shape mirror): every cast rendered in full — exactly the individual cast page's pipeline (react-farcaster-embed SSR, unfurl-enriched URL embeds ≤3/cast, shim-hydrated quotes ≤3/cast via the same fetchQuote (/h with the /u→/wc fallback), hardened blank targets, per-card live-stats slot; LIVE_STATS_SCRIPT fills every slot on the page). Author attached from the hydrated entity (shim timeline rows are author-implied); minimal @handle head linking the profile (the link echoes the validated input, the visible handle carries the primary — identity law), plus the stateful FEED menu + auto-open (farcaster + quorum are the seeded feed targets — quorum's pill is coarse-only and scheme-only, its list shows top-level casts; suppressed to an empty row + read-only notice when unsigned; every card's farcaster.xyz cast anchors (Show-on-Farcaster icon + client-built stats links) retarget to the local waypoint via the shared renderEmbedCard — signed or not, the waypoint always resolves (profile anchors and author-typed farcaster.xyz links stay)); OG preview identical to the profile's (same card visual, deeper page — canonical/og:url stay on this URL); no JSON twin (alternate link omitted). Fleet /f verdict ⇒ 404; every source unreachable ⇒ 503 + Retry-After; timeline failure fails soft, ok-empty ⇒ "No casts yet."
/~/conversations/:hash (0x…)Hono redirectWarpcast legacy thread-shape alias — the purest waypoint, no surface: resolve via shim /h/{hash} (fid fallback via /u when the cast is username-less) and 302 (not 301 — mapping stays cache-free) to the canonical /{username}/{fullHash} cast waypoint — the PRIMARY handle (fname first; shim /u answers it too), relative Location (dual-serve hosts stay self-contained); a bare shim miss is no verdict — the index is partial (kept-warm fids only) — so it falls to the farcaster.tv hash-only rescue (/~/0x…, resolves the live chain; raw nodes can't — castById demands fid + full hash), which also fires a fire-and-forget shim /refresh warm so the next visitor hits /h; 404 only on an authoritative rescue miss / unresolvable username, 503 + Retry-After when the surviving source is unreachable; short hashes miss at shim (measured) and 404 honestly
/~/profiles/:idHono redirectfarcaster.xyz's fid-profile URL shape (it renders the profile in place; the {username} shape answers there too) — forkcaster keeps ONE canonical surface per account, so it's a waypoint, not a second page: all-digits ids resolve via shim /u/{fid} (profile-family discipline — 8s window, one retry; non-2xx/throw ⇒ 503 + Retry-After, HTTP-200 miss ⇒ 404) then 302 (never 301 — mapping stays cache-free) with a relative Location to /{username} (the PRIMARY handle — shim /u is fname-first); the username shape canonicalizes with zero fetches (charset gate, lowercased); ids past Number.MAX_SAFE_INTEGER and charset garbage 404 with zero fetches; trailing-slash form 301s to the non-slash alias (query preserved)
/~/channel/:idHono SSRChannel landing (waypoint law, identity-only): the identity card from the official Farcaster channel API (api.farcaster.xyz/v1/channel — the host formerly at api.warpcast.com, byte-identical; keyless, ~150ms, zod-wrapped in worker/warpcast.ts) — header banner/icon, name + /{id} handle, description (escaped plain text, no mention resolution), created date + lead-fid facts; engagement counts (follower/member) are withheld from HTML and live in the JSON twin; way out = a hand-verified pill trio (per-target provenance in the client registry) — Farcaster (farcaster://~/channel/{id} native attempt, source-verified against the open-source app; the ~/ is load-bearing), Firefly (firefly.social/channel/farcaster/{id}, web-only, owner-confirmed route) and a coarse-pointer-only Quorum pill (quorummobile://feed?channelKey={id}, source-verified; its web build has no channel page, so desktop never sees it) + the channel's own external link only when http(s); the row rides the cast page's stateless DEEPLINK_SCRIPT for click-time native attempts — no fc_client memory, no click telemetry (owner call: don't remember or track); SSR is byte-identical for every device (CSS pointer-class picks, no UA sniffing). OG og:type website, twitter:card summary, image = channel icon. The /~/channel/{id} form — farcaster.xyz's own channel URL shape, which canonical + og:url carry — is the only shape served: the bare /channel/{id} shape 404s with zero fetches (a plain id would shadow a user literally named channel, while /channel/0x… hashes fall through to the cast route — the tradeoff /transparency still carries). Registered BEFORE the two-segment cast route so hash-shaped ids route here; charset gate lowercases and 404s garbage with zero upstream fetches. 404 on the API's HTTP 400 miss; 503 + Retry-After on anything else (no fail-open source). One stateless script (the trio's DEEPLINK_SCRIPT), zero cookies, zero telemetry. The recent-casts skeleton is deferred: shim's channel feed measured 8–15s+ per call
/~/channel/:id?format=json (or Accept: application/json)Hono JSONStrict-status channel twin: { id, name?, description?, image?, headerImage?, createdAt?, parentUrl?, leadFid?, moderatorFids?, followerCount?, memberCount?, publicCasting?, pinnedCastHash?, externalLink?, farcaster } — 404 / 503 + Retry-After like the profile JSON; carries the engagement counts and routing data (parent key, pinned cast) the HTML withholds; listed in /api/
other missing pathsworker 404 / no SPA fallbacknot_found_handling: none

Multi-domain (dual-serve): the same worker serves forkcaster.xyz and warpcats.com (custom-domain routes in wrangler.jsonc). All code is host-agnostic (per-request origin, same-origin fill script, host-only cookie), and every page canonicalizes to the primary: cast pages emit <link rel="canonical"> + og:url from the PRIMARY_ORIGIN var (absent when unset — bare workers.dev keeps the pre-dual-serve output), the landing's canonical is baked into index.html. Race telemetry carries the request host as a blob for per-domain breakdown. Cookies/badges are per-domain by design.

Agent JSON variant (?format=json)

Shipped. Resolve once (fleet-raced cast lookup + unfurl + quote hydration + signed check → resolveCast()), render twice — renderCastHtml() / renderCastJson() in worker/cast-page.tsx. The return type morphs on the asker.

Negotiation — explicit first, no UA sniffing:

SignalResponse
?format=json query paramJSON (documented contract; wins over Accept)
Accept: application/jsonJSON
anything else (browsers, */*, chat link-preview bots)HTML

Decisions:

  • JSON only — no kv/plain-text form (kv is lossy; JSON's token overhead is negligible).
  • Strict statuses on JSON, lenient on HTML (deliberate divergence): JSON → 404 when the fleet consensus is "no such cast", 503 + Retry-After: 60 when every source is unreachable. HTML keeps its 404 page / 200 link-only page. Agents handle status codes better than rendered fallbacks.
  • Availability-gated payload — a field appears only when its data exists: author, ISO 8601 timestamp, text, image embed URLs, URL embeds (unfurl title appended when unfurl succeeded, bare URL otherwise), quote embeds, canonical farcaster.xyz + Firefly links. The author username, the farcaster link, and hydrated-quote pointers carry the PRIMARY handle (identity law: fname first; ENS names are attestations).
  • Quotes are pointers, never dropped: hydrated quote → forkcaster URL (requires the username from the hydrated cast — the quoted author's PRIMARY handle under the identity law); hydration failure → Firefly full-hash URL (quote embeds carry {fid, hash}, no username). HTML's rendering constraints (unguarded author.pfp.url) don't apply to JSON — failed hydration degrades to a URL the agent can fetch.
  • Ban signal: signed: false emits a short note field; unknown/failed check fails open silently (same fail-open semantics as the HTML action row).
  • Discoverability: HTML pages emit <link rel="alternate" type="application/json" href="?format=json">.
  • Deferred: UA-allowlist morphing (GPTBot, ClaudeBot, …) as a later progressive enhancement. Must stay an allowlist — Telegram/Discord/iMessage preview bots must keep receiving HTML + OG meta.
  • Cast HTML shells edge-cache 12h (worker/edge-cache.ts — found-complete only, cookie-free requests only, salted keys); every JSON variant bypasses the cache entirely and must stay that way.

MCP

https://forkcaster.xyz/mcp (also warpcats.com/mcp) — MCP Streamable HTTP endpoint, public, no auth, stateless. One tool: get_cast_link — resolve a Farcaster cast (full 40-hex hash, or fid/username + short hash) into deep-link URLs for any supported client, with the author's signed-contract status. Links-only clients (requiresExternalLinks) are gated: they answer client_ineligible and drop from all when the resolved cast carries no external URL embed. Wiring: worker/mcp.ts (SDK) + worker/cast-ref.ts (zod contract, shim-direct resolution).

Registry listing: server.json (repo root, official registry schema 2025-12-11, name xyz.forkcaster/mcp). To publish, install the official publisher CLI — a GitHub-release binary. ⚠️ do NOT bunx/npx the npm package mcp-publisher — it's an unrelated browser-automation project that collides with the name:

sh
curl -L "https://github.com/modelcontextprotocol/registry/releases/latest/download/mcp-publisher_linux_amd64.tar.gz" | tar xz mcp-publisher && sudo mv mcp-publisher /usr/local/bin/

One-time domain verification: generate an ed25519 keypair (openssl genpkey -algorithm Ed25519 -out key.pem), add the apex TXT record it prints (v=MCPv1; k=ed25519; p=<public key>), then:

sh
mcp-publisher login dns forkcaster.xyz --private-key <hex>   # signs the challenge → xyz.forkcaster namespacemcp-publisher publish                                        # submits server.json to registry.modelcontextprotocol.io

key.pem is the publishing credential — keep it safe, never commit it.

Cast source race

Cast lookups race the provider fleet (worker/cast-source.ts, rpc-racer pattern: per-provider abort + 5s cap armed at actual leg start, first validated win, losers aborted; a win must resolve the requested hash, else it's downgraded to an error). The roster: the shim-potato fleet (the SHIM_POTATO_BASE var carries the FULL shim fleet, comma-separated, cloud's own base included — var order is the stagger/primary order, first entry leads at 0ms; a fast winner cancels the stragglers before they fire), the haatz/snap raw nodes, and quote-blind farcaster.tv (partial). No var = the legacy cloud-led roster. The strict JSON twin rides the complete-leg subset via jsonRoster (fleet members only, no box, no partial legs).

Miss semantics are collective — no single host is the source of truth (SPOF softened Oct 2026; cloud retires into the fleet): the first affirmative answer wins outright; a consulted miss (HTTP 200, index asked, no data) is a vote, and not-found settles only when every miss-authoritative leg has consulted and missed — a pending leg can always rescue a landed miss; errors surface only when every leg errored (503 + Retry-After). The price: a true miss 404s as fast as the slowest leg instead of the fastest. farcaster.tv (partial) never votes.

The fleet races every shim read (worker/shim.ts, raceShimProbe): the profile family (/f, /user, /signed, timeline), the quote hydrator's /h→/u→/wc chain, both aliases, the signed check on cast pages, and the MCP tool each race cloud against every configured potato. Same collective contract. Without the var every wrapper is a pass-through (exactly one fetch, byte-identical behavior). The /refresh index warm covers every host in the fleet.

Sufficiency matrix (measured Oct 2026) against the internal ShimCast contract (text, hash, unix-seconds ts, raw {url}/{castId} embeds, inline user data):

ProviderResolves (username, hash)?Quotes ({castId})Verdict
shim✅ short + full✅complete — canonical, wins anytime
haatz (haatz.quilibrium.com/v1)⚠️ full hash only + fid via shim /f/{username}✅embed-complete, text-blind — full-hash requests
snap (snap.farcaster.xyz:3381, official gateway; 443 hangs)⚠️ same as haatz✅embed-complete, text-blind — full-hash requests
farcaster.tv✅ short (prefix-match)❌ silently droppedpartial — quote-blind (text canonical)

HTML path (700ms completeness box): complete providers win anytime; a quote-blind farcaster.tv win is held until the box expires, then served as a partial page — the SWR tradeoff the OG meta is immune to: title/description/image never depend on quotes, so chat-bots' cached embed cards are always complete. The partiality only reaches live browsers, which self-heal: partial pages ship QUOTE_FILL_SCRIPT, which fetches ?embeds=quotes (fleet-raced shim resolution + quote-hydrated SSR fragment, no-store) and injects it — same silent-degradation contract as the live-stats script. Text-blind wins (mention-bearing raw-node casts — the gateway strips the mention placeholder characters shim substitutes) are held harder: they never ship while a canonical-text leg (shim + the fleet) is pending, box or not, and fail open only once those legs settled miss/error — marked partial + textCanonical:false, never edge-cached (a body can't self-heal) and QUOTE_FILL withheld (their quotes are already inline). Mention-free raw casts are byte-identical to canonical text and win outright. Shell caching: every HTML request on cast pages may be served a cached found, text-canonical shell (worker/edge-cache.ts, 12h s-maxage, salted query-free keys — SHELL_SALT v2 bumped to purge shells cached from mention-stripped raw wins, hits rewritten no-store) — personalization is client-side (SHELL_SCRIPT), so cookie-holders get the same bytes; link-only pages, 404s, 503s, text-blind founds and JSON variants never cache (quote-blind partials do — OG complete, QUOTE_FILL heals per view).

JSON path: the complete-leg fleet roster (jsonRoster — shim + potatos, boxMs: null) — always complete, strict statuses (404 / 503 + Retry-After), the never-drop-quotes invariant holds unconditionally.

Miss semantics: misses are votes — not-found settles only when every miss-authoritative complete leg has consulted and missed (a pending leg can always rescue a landed miss); farcaster.tv 404 alone never produces a 404 (cast might exist). Every-leg-errored ⇒ link-only page (HTML) / 503 (JSON), fail-open as usual.

Ban signal: not part of the cast provider race — it's orthogonal to cast content — but /signed/{fid} is a fleet-raced shim read like every other (first answer wins, unknown fails open), time-boxed to the HTML box.

Telemetry: every resolve writes one Analytics Engine datapoint (RACE_STATS binding, non-blocking via waitUntil): index = winning provider (or outcome kind), doubles = total ms / box / partial flag, blob = per-provider id:kind:ms rows measured from each leg's actual (staggered) start — race-abort losers record abort, not error, and legs whose stagger never fired record nothing. Raw-node legs that settle their identity race also write one FID_RACE datapoint each (index = winning source shim/node, blob = leg + host, double = ms). Query via the AE SQL API when tuning the box (scripts/probe/, scripts/race-stats.ts); tests and callers without an executionCtx skip it.

Follow-up: quote hydration could race haatz/snap (/h/{fullHash} vs castById) for extra completeness — the shim-internal /u/{fid} → /wc fallback (Oct 2026) already rescues casts the hash-only /h index misses.

Observed full Hypersnap nodes (documentation only — not wired into the race roster)

Two additional public Hypersnap nodes were observed live via their self-reported /v1/info endpoint (the same public info endpoint haatz exposes). They are full Hypersnap nodes (Rust Farcaster node, HTTP on :3381) operated by independent parties — not part of cast-source.ts's race roster (shim / farcaster.tv / haatz / snap), and no code references them. Listed here for operator visibility only.

NodeVersionMessagesFIDsApprox sizeShardsPeer ID
https://hypersnap.rainonmeproductions.com0.15.0914,368,0203,356,878~812.9 GB3 (0,1,2)12D3KooWMzgU6PgzsJ4…
https://hypersnap.castrater.xyz0.16.0914,368,0253,356,878~797.0 GB3 (0,1,2)12D3KooWRjMdSgmsuh1n…

For comparison, the wired nodes report: haatz 0.16.0 / 914,368,020 msgs / ~797.6 GB / peer 12D3KooWMYfkXiNcn9L…; snap 0.16.0 / 914,368,024 msgs / ~551.3 GB / peer 12D3KooWH527dqZTziqz…. Message and FID counts match across all nodes (same network); approxSize differs per-node (local RocksDB storage). Both answer GET /v1/info with dbStats (numMessages, numFidRegistrations, approxSize), numShards, shardInfos (shardId, maxHeight, numMessages, blockDelay), version, and peer_id. No race integration, no cache, no telemetry wiring — purely informational.

Race stats (/transparency)

The racing-stats table is filled offline — the render path stays cache-free and stats-free. bun run stats (env per .env.example) queries Analytics Engine through the SQL API — sample-weighted (sum(_sample_interval), quantileExactWeighted; never raw count()) — assembles a versioned snapshot (v: 1; wins/requests/p50/p95/errorRate per provider + outcome counts) and publishes it as one lmdis key (race-stats on lmdis.artlu.xyz, the owner-run Redis-shaped KV) through the vendored Upstash-shaped SDK. Overwrite-only-on-success; --dry previews.

The transparency route reads the snapshot through a per-isolate TTL cache (worker/race-stats-store.ts: 10 min TTL, 60s failure backoff, last-good served ≤24h, 2s read cap) and fills the table, the "stats as of" line, and the JSON twin's racingStats — absent/unreachable snapshot ⇒ "coming soon" dashes, silently. /race-stats.json serves the raw snapshot (404 when absent). Both responses are edge-cached (Cache API: the transparency page s-maxage=60, the raw snapshot s-maxage=300) — the reads and the render run at most once per colo per TTL window; cached hits trigger zero lmdis reads, and the three store reads fire as one parallel fan-out (concurrent GETs don't queue server-side). bun run stats:check reads the live snapshots directly and pushes to ntfy.sh when thresholds breach (provider p95/errorRate, snapshot staleness as the pipeline's dead-man's-switch, lmdis unreachable; --dry previews; env in .env.example). Alerting layout: Uptime Kuma (owner-hosted, ntfy) owns uptime probes + a stats-pipeline push monitor; stats:check owns data-quality thresholds; the self-hosted VPS runs a box-local potato-watch cron (disk/load/memory → ntfy). Synthetic monitors never target cast URLs — each probe would trigger a full provider race and pollute the published stats. SQL dialect + store behavior are live-verified by scripts/probe/ (the AE dialect has no CONCAT and only toUInt32/toUInt8 conversions; SQL errors come back as plain-text 422s; the SQL API rejects Account Owned Tokens — use a User token with Account Analytics:Read).

Fid races (/transparency, parallel to race stats)

The raw-node legs race the shim fleet's /f/{username} against the node's own /v1/userNameProofByName for the author fid (see "Cast source race"). Each settled race writes one FID_RACE Analytics Engine datapoint (index = the WINNING source id — the leg's own id haatz/snap, or the shim-side member that named the fid: shim for the cloud reader, shim-potato/shim-potato-2/… for fleet members by var position; blob = leg id + host, double = the winner's ms), and bun run stats:fid (same env discipline as stats) aggregates it into a second lmdis key (fid-race, overwrite-only-on-success, --dry previews). The snapshot is v:2 with an OPEN source vocabulary — rows are grouped by the dataset's own ids at aggregation time, so fleet members join the table as they appear (a v:1 snapshot is ignored; re-run the job to publish v:2). Every host is tracked independently — a member's win is attributed to that member, never merged into a bucket. /transparency reads it through worker/fid-race-store.ts — a line-for-line mirror of the race store (same TTL/backoff/stale contract) — and renders the Author id races item (wins/p50/p95 per observed source, raw ids as row labels + raced-lookups line) plus the JSON twin's fidRace block (status: live | coming-soon). Declared as a third entry in tracking.counters (fidRace); no cast IDs, no identifiers.

Abort telemetry: race-cut losers are recorded as provider:abort:<ms> (not error) so public errorRate stays honest — the 700ms box cuts slow completes by design; the 5s hard-timeout still counts as an error. raceCast drains pending settles after abort (bounded 25ms) so timing rows never escape incomplete.

Client rank (click-through stats, /transparency)

Which client people actually open casts with — measured, weighted, published, and used to order the pill row. Pipeline mirrors race stats exactly:

  • Capture (POST /t, allow-listed in worker/track.ts): one anonymous datapoint per client selection — slug, kind (pill explicit click / auto timer-fired redirect / go-now explicit open), transport (native when the click-time path attempted the app), coarse device class (client-side matchMedia, keeping the no-UA-sniffing invariant), host. The first/switch/repeat flag is computed client-side from the visitor's own cookie before the click rewrites it — the server never sees it. Invalid bodies are indistinguishable from valid ones (204 always). Never captured: which cast, usernames, IPs, UA strings, identifiers — the negative list is the privacy design and /transparency declares it. Beacons ride TRACK_SCRIPT (window.__fk, sendBeacon → keepalive-fetch fallback) called from CLIENT_SCRIPT (pills) and AUTO_SCRIPT (auto / go-now, incl. the countdown link, which also cancels the pending timer so a manual native attempt isn't re-redirected).
  • Weighting (defuses the auto-open feedback loop — auto events echo an earlier choice): first ×1.0, switch ×1.0, go-now ×0.8, repeat ×0.3, auto ×0.1. Score over a trailing 7d window (bun run stats:rank → lmdis key client-rank, overwrite-only-on-success, same env as stats). total < 100 ⇒ warmingUp — counts shown, shares withheld.
  • Consumption: worker/client-rank-store.ts (same TTL/backoff/stale contract as the race store). /transparency reads full-cap and renders the Client choices table + JSON twin clientRank (weights are part of the published contract). The cast render path reads through getRankSnapshotSoon(env, 400) — a cold lmdis refresh never stalls a page; timeout ⇒ registry order. Pills are reordered, never hidden (every offered client renders; registry order is the tiebreak; the registry kill switch outranks popularity).
  • Disclosure: the /transparency Tracking section declares both counters (tracking.counters is { pageLoad, clientChoice } — the declared agent-facing shape), and the auto-open flow is covered by the click event.

Client registry (action row, last-used badge)

The cast page's "Open in …" pills are rendered from a data registry, worker/client-registry.ts — adding a verified client is a data change only. Adding one is a guided workflow: the add-client skill at .claude/skills/add-client/SKILL.md (verify the per-cast URL against open-source code/docs plus a live check, write the entry with its provenance comment, add the self-hosted logo, update the roster-guard tests, run the checks, PR per CONTRIBUTING.md).

  • Schema (ClientDefinition): id (stable slug, cookie value), title, logoUrl (served from public/logos/), web (per-cast https template), deeplink (optional native mobile target — activates the click-time scheme attempt described below; absent ⇒ web-only), requiresSigned (suppressed only on a known signed:false; unknown fails open), requiresExternalLinks (cast-eligibility gate for links-only clients: offered only when the cast carries at least one external URL embed — fail-closed, unknown hides; the shared blockedByLinkGate predicate gates the MCP tool identically, answering client_ineligible and omitting the client from all).
  • Templates interpolate {username}, {hash} (route-form, short or full), {fullHash} (Shim-resolved) and {fullHashRaw} (bare lowercase hex, no 0x — derived from {fullHash} for apps that key internally on raw hex). The engine also supports an optional {fid} placeholder with a missingVars gate (a client needing it is skipped when the value is absent). Values are percent-encoded at resolution and HTML-escaped at render.
  • Mobile deeplinks vs web targets: one pill per client; the href is always the web URL. Universal links already open installed apps on mobile — which clients have verified claims (AASA paths, assetlinks.json package ids), and how each was confirmed, is recorded per entry in the registry comments. A structured deeplink: { scheme, androidPackage? } adds a native attempt for mobile only: the pill gains data-scheme + data-intent (the intent:// form carries S.browser_fallback_url = the web URL), and a conditional script intercepts clicks on coarse-pointer devices — Android uses the intent (Chrome-native fallback), everything else attempts the scheme and falls back to the web href if the app didn't open (~1.8s, visibility-aware). The auto-open redirect mirrors the attempt: the banner carries server-resolved data-auto-scheme/data-auto-intent, phones attempt the app with a 2.5s visibility fallback (no user gesture anchors a timer-driven navigation, and Quorum cold-starts past 1.8s), the countdown's client-rendered anchor carries data-scheme so manual taps go through the click-time script, and desktop or web-only clients keep the plain redirect. The script ships only when a rendered client actually has a deeplink. Which clients ship a scheme — and how each scheme was verified — lives in the per-entry registry comments.
  • Roster — deliberately not enumerated in docs: CLIENTS in worker/client-registry.ts is the source of truth and the one place the roster is listed; each entry's comment records its verification evidence (URL-format provenance, scheme/manifest checks, live verification, per-client limitations). Every roster entry carries a verified per-cast target: a per-cast web template, or — when the client has no web cast route — a homepage-stub web href whose native scheme is the only per-cast target (a scheme-only entry). Entries arrive verified or not at all: an unverified format is never added, not even as a stub.
  • Last-used cookie: any click on a data-client pill writes fc_client=<id> (1 year, SameSite=Lax) via CLIENT_SCRIPT. On cast pages the badge is applied CLIENT-side (SHELL_SCRIPT reads the local cookie and badges the matching pill — the server is cookie-blind, which is what makes the page edge-cacheable); unknown cookie ids resolve to nothing (registry-derived pill set). On profile pages the worker still reads the cookie and SSRs the badge. No JS ⇒ links still work; the badge just doesn't appear. Cookie-conditional profile HTML: never edge-cached.
  • Logos: self-hosted in public/logos/, one small static file per client (SVG, or PNG downscaled to ≤64px). Self-hosting is deliberate — no hotlinking: a client-CDN logo would leak every visitor's IP to that client's servers on every page view (a tracking surface the /transparency declarations would have to carry), and hotlinks break anyway (referrer checks, 403s) — so there is no remote-fallback path either. The pill's <img> renders logoUrl uniformly; no per-client code paths.

Shim → CastData mapping

Providers return different shapes; cast-source.ts normalizes everything onto ShimCast (shim's raw Snapchain shape). toCastData() in worker/cast-data.ts then adapts it for react-farcaster-embed:

  • timestamp is unix seconds → multiplied by 1000 (the embed does new Date(ts))
  • embeds are untyped {url} / {castId} items → bucketed into images / urls / casts; image heuristic = imagedelivery.net host or image extension. Quotes are hydrated through Shim GET /h/{fullHash} — with a /u/{fid} → username → /wc/{username}/{hash} fallback when the hash-only /h index misses a live cast (measured Oct 2026) — at depth 1 and mapped like any cast; hydration failure (e.g. pruned casts) drops the quote. URL embeds render as link cards via openGraph (see unfurl above)
  • message-level data has no engagement counts → replies/reactions/recasts stubbed to { count: 0 } and tags: [] — the embed bundle reads e.recasts.count and e.tags.length unguarded and crashes without them (it also reads quote.author.pfp.url unguarded — never emit quotes without hydrated authors). The stubs would render as hardcoded zero counters, so the stats row is stripped from the SSR output (STATS_ROW); the Farcaster logo in the same container stays
  • author mapped from user (pfpUrl → pfp.url, bio → profile.bio.text)

Conventions for agents

  • Preact, not React for first-party code. Vite aliases map react* → preact for the embed lib.
  • Cast routing is server-side (Hono), not client-side routing.
  • Tests: mock.module("server-only"|react*) before importing ./index.ts; mock globalThis.fetch by exact Shim URL — unexpected URLs throw, which is how fallback paths get tested.
  • TS worker: jsxImportSource: preact; relative imports need .tsx extensions (nodenext); tests excluded from tsconfig.worker.json.
  • Secrets: .env* / .dev.vars* gitignored.

Key files

TaskTouch
Shim mapping / resolve / SSR renderersworker/cast-page.tsx (+ cast-data.ts, cast-actions.tsx, cast-scripts.ts, shell.tsx)
Provider race / cast data sourcesworker/cast-source.ts
Client roster / action row dataworker/client-registry.ts
Routesworker/index.ts
Aliasesvite.config.ts, tsconfig.worker.json paths
Landingsrc/App.tsx
Deploy / CFwrangler.jsonc

Status

Fleet-raced SSR data path under collective miss parity (worker/race.ts): shim + the shim-potato fleet + haatz/snap + farcaster.tv; staggered hedged starts; HTML serves quote-blind wins after a 700ms box and self-heals quotes client-side, and holds text-blind (mention-stripped) raw wins until canonical text settles or is proven unavailable; JSON rides the complete-leg fleet roster with strict statuses. Agent JSON variant (?format=json) shipped. Registry-driven action row shipped: last-used badge, Farcaster native deeplink (farcaster://, verified), a verified per-cast target for every roster client. MCP endpoint live (/mcp).

来源：README.md，提交 9aa6c0c

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  1. v1.0.0最新Oct 22, 2026

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