ai-persistence/build-custom-adapter SKILL.md skillA
ai-persistence/build-custom-adapter from tanstack/ai is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add tanstack/ai/ai-persistence/build-custom-adapter@git:20261027.669fd31Pins git:20261027.669fd31 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- tanstack/ai
- Path
packages/ai-persistence/skills/ai-persistence/build-custom-adapter/SKILL.md- Versions recorded
- 8
- Latest version
- git:20261027.669fd31, committed Oct 27, 2026
- First version recorded
- Jul 27, 2026
- Size
- 29,424 bytes
- Repository stars
- 3,337
- License
- MIT
Use when an app needs TanStack AI chat persistence on a database with no dedicated recipe — raw Postgres (pg/postgres.js), Kysely, node:sqlite, MongoDB, Supabase, Redis. Writes a chat-persistence.ts against the app's existing client, covering the four stores, the idempotency invariants, and the conformance gate. Route to the Drizzle, Prisma, or Cloudflare skills instead when one of those matches.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Custom Chat Persistence The deliverable is **one file in the app** — `src/lib/chat-persistence.ts` — exporting a `ChatPersistence` built from the database client the app already has. Plus whatever DDL that database needs, added through the app's existing migration flow. Do not create a package, a second client, or a migration runner. **Always write all four tables (or collections) and all four stores: thread, run, interrupt, metadata.** The docs call `interrupts` and `metadata` optional for a hand-rolled adapter; this recipe is not that case. `withPersistence` needs all four to type-check as `ChatPersistence`, and the conformance suite fails without them. Do not stop at a thread table and a run table. **Route first.** If the app already runs one of these, stop and use that skill — it has the driver-specific code: | App runs | Use | | ------------------------- | --------------------------------------- | | Drizzle ORM (any dialect) | ai-persistence/build-drizzle-adapter | | Prisma | ai-persistence/build-prisma-adapter | | Cloudflare Workers + D1 | ai-persistence/build-cloudflare-adapter | …
Read the whole file at its exact version.
How to install
mdr add tanstack/ai/ai-persistence/build-custom-adapter@sha256:9156ca712ab077c7The line at the top of this page pins the label git:20261027.669fd31, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_izatd4xb437olgi4)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 8 versions of this file, between Jul 27, 2026 and Oct 27, 2026, about one every 13 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261027.669fd31 latest | 2026-10-27 | 669fd31 | 29,424 B | A | view · diff |
| git:20261027.2f86841 | 2026-10-27 | 2f86841 | 19,390 B | A | view · diff |
| git:20261002.0d5b2ea | 2026-10-02 | 0d5b2ea | 19,017 B | A | view · diff |
| git:20260924.9ab4f76 | 2026-09-24 | 9ab4f76 | 17,858 B | A | view · diff |
| git:20260909.53e2ec0 | 2026-09-09 | 53e2ec0 | 16,457 B | A | view · diff |
| git:20260804.d9d1e1f | 2026-08-04 | d9d1e1f | 16,471 B | A | view · diff |
| git:20260731.996a980 | 2026-07-31 | 996a980 | 12,627 B | A | view · diff |
| git:20260727.4ab149f | 2026-07-27 | 4ab149f | 12,516 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (29424 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
tanstack/ai · 3,337 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_izatd4xb437olgi4 GET https://markdownregistry.com/api/v1/resolve?ref=tanstack/ai/ai-persistence/build-custom-adapter GET https://markdownregistry.com/api/v1/blob/9156ca712ab077c7c3219a4236ac664c129aebcbf2f3deb39c6543cafb113d82
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.