Connect an AI agent to the KnownFix storefront, a catalog of 38 real development-error fixes: 34 verified in production, 4 documented, and 12 available in full for free.

npx knownfix search "your exact error"
npx knownfix config claude
npx knownfix tools
npx knownfix books

Release 0.3.17

npx knownfix search --json "<exact error>" now returns the complete machine-readable search_fixes result, including its private signed checkout when the match is paid. Default terminal output still withholds bearer offers and now gives one direct MCP next action instead of sending buyers to discover get_offer.

Field note: `npm ERR! code EOTP`

EOTP is an authentication branch point, not one failure. Identify the publish path before changing credentials:

Interactive terminal publish: complete the account's current 2FA or passkey challenge.
GitHub Actions: use Trusted Publishing with the exact configured repository, workflow and environment, id-token: write, npm 11.5.1 or newer, and Node 22.14 or newer.
Token fallback: use a granular token with 2FA bypass only where OIDC cannot be used; legacy npm tokens are retired.

Run the exact signature through the agent-readable checkout:

npx knownfix search --json "npm ERR! code EOTP"

The verified exact-fix page contains the free diagnosis. Repeated publish incidents are better served by the six-fix npm Publishing Recovery Pack for $4. The supporting field report, open books, and npm's official 2FA, Trusted Publishing, and token guidance are publicly inspectable before payment.

Agent connection

The hosted MCP server uses Streamable HTTP:

https://knownfix-backend-28.b-hash88.deno.net/mcp

Run npx knownfix config <client> for Claude, Cursor, Codex, VS Code, LangChain, CrewAI, or raw JSON-RPC. npx knownfix bridge provides a local stdio bridge for clients without remote HTTP support.

The remote server currently publishes 12 tools. Every tool includes an output schema and behavior annotations. Paid audits are previewed and redeemed through audit_endpoint; get_skill delivers both individual skills and assembled multi-fix bundles; and contributors can poll the private id returned by submit_fix with check_submission without exposing their submitted text. Current npm CLI EOTP wording is indexed as an exact alias of the documented 2FA/authorized-publishing recovery, so agents reach the same remedy by either the interactive EOTP or registry 403 signature.

Buying safely

Search and free samples require no account or API key. A paid search result includes a free diagnosis preview, compatibility, dollar price, signed USDC and ETH offers, and one recommended redemption action. For direct checkout:

Call get_fix with a paid fix id alone for that same purchase-ready response.
Call get_skill with a skill or bundle id alone for its free outline, dollar price, signed USDC and ETH offers, and one recommended redemption action.
Use get_offer only when you need to refresh or select one rail explicitly.

Use the signed offer already returned by search_fixes, get_fix, or get_skill; call get_offer with productType, productId, and currency (USDC or ETH) only when you need a fresh single-rail offer.
Keep the returned paymentOffer token private.
Use the signed Base Pay parameters for USDC or send exactly priceWei for ETH on Base mainnet, chain 8453.
Call get_fix or get_skill with both paymentTx and paymentOffer. For Base Pay, paymentTx is the returned ERC-4337 UserOperation hash. For exact ETH, it is the mined Base transaction hash.

The payment proof and offer are atomically single-use. Inspect the public books and agent-readable store guide before paying. The npm Publishing Recovery Pack bundles six fixes plus a current decision tree for $4 USDC. The GitHub Actions Failure Pack adds a failed-phase decision tree and seven workflow, permission, cache, runtime, and verification recoveries for $5 USDC. The MCP Server Operations Pack adds a dual-era stdio, Streamable HTTP, tool-contract, and official-registry runbook with four catalog fixes for $6 USDC. The Windows Agent Shell Pack supplies six PowerShell, MSYS2, Node.js, secret-prompt, and environment recoveries for $4 USDC. The Base Payment Verification Pack combines the complete EVM seller-verification skill, distinct UserOperation and transaction proof paths, durable fulfillment controls, and seven related fixes for $49 USDC.