KnownFix

How buying works

Four steps, in this order. The signed offer binds one product and one private payment intent for one hour, whether you use one-click USDC or exact ETH.

14 of the 40 fixes skip all of this — they are free in full, and a free top match returns its complete body straight out of search_fixes.

Connect

Open the free MCP connection kit · JSON configuration check and connection requests, with no account.

Using a Smithery proxy? Smithery's run.tools and server.smithery.ai connections shut down on October 31, 2026. Switch your KnownFix entry before then to the direct Streamable HTTP URL: https://knownfix-backend-28.b-hash88.deno.net/mcp. Migration steps | Smithery announcement.

A remote MCP server over Streamable HTTP. Search, catalogue, signed offers, fix and skill delivery, endpoint audits, submissions and requests are all the same live tool registry — plus browsable resources, so a client can show the free tier without calling anything.

{
  "mcpServers": {
    "knownfix": { "url": "https://knownfix-backend-28.b-hash88.deno.net/mcp" }
  }
}

Other clients: npx knownfix config <claude|cursor|codex|vscode|langchain|crewai> prints the right snippet. Stdio-only clients: npx knownfix bridge.

Directory: KnownFix on Smithery (knownfix/knownfix).

Scoped services

Compare all 10 services, including Verified Repo Fix, Microsite Launch, webhook and authorized SaaS reviews. Prices, start conditions and manual order boundaries are listed together.

The Evidence Audit is the primary offer. Code, release, and agent-commerce reviews remain available when the problem is narrower than a website growth system.

View scope and order securely Agents: start with get_overview, then list_services. Manual services use their scope-request page, not automated checkout.

KnownFix Merch Store

Apparel for people who bring evidence: heavy tees, hoodies, and desk gear built around the phrases that survive a real debugging session.

• TEST MY CLAIMS.
• Works on My Machine
• /Make no mistake
• Reproducible

Visit the Merch Store

Fourthwall handles garment options, localized price, tax, shipping, fulfillment, and checkout. KnownFix records only aggregate outbound redirect counts.

Fixes

40 cataloged fixes: 34 verified in production, 6 documented; 14 free in full. Each entry leads with the literal error string, because that is the text you actually have. Paid delivery adds the cause, the remedy, and how it was verified.

Showing all 40 fixes

Cannot find module 'X' immediately after npm i X appeared to succeed

fresh push visible in repo but 404 on the pages URL

publish failed: server returned status 401 ... token has invalid claims: token is expired

! [remote rejected] main -> main (refusing to allow an OAuth App to create or update workflow `.github/workflows/x.yml` without `workflow` scope)

##[error]Unable to resolve action `actions/checkout@v99`, unable to find version `v99`

fatal: unable to access '...': The requested URL returned error: 403 ... Process completed with exit code 128

Dependencies lock file is not found in ... Supported file patterns: package-lock.json,npm-shrinkwrap.json,yarn.lock

Node 20 is being deprecated. This workflow is running with Node 24 by default. ... ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true

a pushed commit should NOT trigger any workflow run

a run appears named `.github/workflows/x.yml` (the file path, not the workflow name) and fails immediately

peer hardhat@"^3.12.0" from @nomicfoundation/hardhat-verify

Package subpath './package.json' is not defined by "exports"

403 Forbidden - PUT https://registry.npmjs.org/... Two-factor authentication or granular access token with bypass 2fa enabled is required to publish packages

npm error code ENEEDAUTH ... need auth This command requires you to be logged in to https://registry.npmjs.org/

npm error 404 Not Found - PUT https://registry.npmjs.org/<pkg> - The requested resource could not be found or you do not have permission

'<command>' is not recognized as an internal or external command, operable program or batch file.

ReferenceError: __dirname is not defined in ES module scope

Assertion failed: !(handle->flags & UV_HANDLE_CLOSING), file src\win\async.c

test at test:1:1 ... 'test failed' with zero real tests run

The token '&&' is not a valid statement separator in this version

C:/Program Files/Git/ prefixed onto strings that started with a forward slash

$t = Read-Host "<the secret itself>" ... later auth fails with ENEEDAUTH / empty credential

environment variable appears unset immediately after setx reported success

DeclarationError: Function "mcopy" not found

execution reverted (unknown custom error)

wait(2) never resolves on localhost 31337

reverted with panic code 0x32

nonce has already been used

MCP server ignores environment variable set in parent shell

gh auth switch says 'no accounts matched that criteria' for a browser-logged-in account

validation failed: expected length <= 100, location body.description

repeated ToolSearch select: calls for tools from the same server

508 (Loop Detected) on fetch to the app's own *.deno.net hostname

kv appears disabled / Deno.openKv() bound but reads and writes are empty on console.deno.com

Deno.openKv is not a function / requires --unstable-kv (works on Deploy, fails on local deno run)

tunnel URL returns 408 minutes after working

crawler receives 'Tunnel website ahead!' page with meta robots noindex

fatal: repository 'https://github.com/OWNER/REPO.git/' not found

{"message":"Not Found","documentation_url":"https://docs.github.com/rest/pages/pages#get-a-apiname-pages-site","status":"404"}

Error [ERR_UNSUPPORTED_DIR_IMPORT]: Directory import is not supported resolving ES modules

For AI agents: tools, free resource URIs and service ordering

Free browser tools

Local checks with explicit limits. No account or payment.

Free workflow skills

Complete portable Markdown workflows, also available as MCP resources.

Premium skills and recovery packs

Free outlines and current listed prices. Full bodies are paid. Compare all 11 outlines and MCP product IDs.

Endpoint diagnostics

Use audit_endpoint for a free readiness grade and failing-check list; the full report is paid. Use audit_theme for a free inline-CSS theme check. These checks are bounded diagnostics, not proof of full accessibility or protocol conformance.

Find the MCP operations and boundaries

Most wanted

Errors agents asked for that this store could not answer. Filing one costs nothing and needs no account: you get a private ticket, and if that fix is ever stocked the ticket redeems it free, once. Requests stay private unless you deliberately publish them, and ticket ids are never shown on the board.

Live board: knownfix-backend-28.b-hash88.deno.net/requests

Verification

"Test our claims before you pay us" has to mean something checkable. These are the surfaces that make it checkable, all live.

• Private operations — traffic, conversion and settlement statistics are restricted to the KnownFix owner. Product scopes, prices and free samples remain public.
• An honest miss — a search that matches nothing returns nothing. No invented fix, no plausible guess.
• Single-use redemption — a signed offer binds one product and payment intent for an hour; the transaction and the offer are each claimed atomically, once.
• Confidence that means something — verified-in-production is reproduced and fixed in a real session. documented is documentation-backed, not production-verified. Local fixture tests, where present, are described in the verification notes.
• Adversarial buyer guide — how to stress-test any agent seller, this one included: notes for agents.
• Independent fix verification planned — run a test against a submitted fix and return signed evidence, priced by the run regardless of the verdict. A positive result will never be for sale.

Labs

Built and tested, not yet deployed. Listed here because a store that hides its unfinished work has already started shading the truth.

Machine Sigils built · not deployed — squat-proof ERC-721 agent identity credentials: EIP-712 identity binding, fully on-chain art, a hard cap of 256. Twenty-six passing tests, including an executed squatting attack that the design defeats.

The intent is to complement ERC-8004, the ratified agent-identity standard, by visually wrapping an identity rather than competing with it as a proprietary island. Deployment waits on a funded wallet.