Imported from zapier/connectors (apps/trello/SKILL.md). Install upstream with npx skills add zapier/connectors --skill trello. Copyright stays with the author (Elastic-2.0).

Trello

Scripts for working with Trello against the Trello REST API (https://api.trello.com/1): create and move cards, manage boards and lists, labels and checklists, comments and attachments, member lookups, and search. 44 scripts across boards, lists, cards, labels, checklists, members, and search.

Independent, unofficial connector for Trello. Not affiliated with, endorsed by, or sponsored by Trello. "Trello" is a trademark of its owner, used only to identify the service this connector works with.

When to use this

• An agent needs to create or update cards — add tasks, set due dates, assign members, add labels, or archive/reopen cards.
• An agent needs to organize boards — create boards and lists, move cards between lists, copy boards, or close (archive) boards.
• An agent needs to look up Trello resources by name — find boards, lists, labels, or checklists before writing.
• An agent needs to search cards or read board/list/card detail for planning or reporting.

Setup

This is an agentskills.io skill.

If the connector has not been installed as a skill yet, install it first with npx skills add zapier/connectors --skill trello (or your harness's own skill-install mechanism), then continue here. Installing the skill copies these files, not dependencies. Before running the CLI, a local MCP server, or zapier-sdk auth commands, run npm install --omit=dev here once. Importing the published package as a dependency in your own project instead? That npm install already resolves everything — see references/use-as-sdk.md.

Want the actual repo source instead — to browse references/, run this connector's tests, or hack on it? See README.md for a scoped git clone.

The connector runs on Node.js 22.18+. Pick the reference that matches how you're running it, and load it before doing anything else:

Scripts

All scripts use the single connection trello. Shared helpers live in lib/trello.ts.

Resolve ids before writes. Trello ids are 24-character hex strings. When the user names a board, list, or label, call the matching find* or list* script first and pass the returned id into create/update/move scripts — never guess ids.

Disambiguation & refusals

Disambiguation before a write. Before writing to a board, list, card, label, or checklist you looked up by name (e.g. create a card on a list found via findList, or add a label found via findLabel), count the exact case-insensitive name matches:

• Exactly one match — act on it. Don't over-ask; a single unambiguous match is the answer.
• Two or more that tie — stop. List the tied candidates with a distinguishing field (id + name + board/list context) and ask the user which one they mean. Don't pick arbitrarily and don't write to all of them.

Unsupported operations — say so and stop; don't fake it with another script. This catalog deliberately does not:

• Manage webhooks, automations, or Power-Ups. There are no trigger or Butler-rule scripts.
• Upload local binary files. addCardAttachment accepts a URL or remote file URL only — not a local path or base64 payload.
• Permanently delete boards or cards. closeBoard and archiveCard archive (soft-close) resources; there is no hard-delete script.
• Manage workspace billing, admin settings, or enterprise policies.

If asked for any of these, tell the user it's unsupported and stop — don't reach for an unrelated script to approximate it.

Auth

Every shape passes auth as one connection selector, not the secret — a [<resolver>:]<value> string. Every connector accepts zapier:<connection-id> (Zapier-managed auth — routes through Zapier's auth, retries, and governance layer); some also accept one or more direct-token resolvers (naming and count vary per connector) — check this connector's own resolvers rather than assuming. The <resolver>: prefix is optional; a bare value goes to the first resolver that claims it — a UUID-shaped bare value always claims zapier:. Each script declares the connections it needs and the resolvers each accepts. The exact syntax for passing a connection (and how to see this connector's resolver list) differs by shape — see the reference you loaded above.

Checking what's already configured first? Don't dump environment values to do it — env or env | grep <name> prints the value along with the name, leaking a live credential into the transcript if one is set. Check names only (env | cut -d= -f1 | grep -i <name>) or test a known name directly ([ -n "$VAR_NAME" ]).

No connection yet? Pick one — and follow the reference's own flow to obtain it; never just ask the user for a connection id or token as if they already have one memorized:

Output format

Every script returns a { data, meta } envelope:

• data — the script's result (the shape its outputSchema declares; see the reference you loaded above for how to inspect a script's exact schema in your shape).
• meta.outputDataValidation — what validating data did:
  • { skipped: false, droppedPaths: null } — validated, nothing removed.
  • { skipped: false, droppedPaths: [...], instruction } — validated, but those paths were stripped from data: fields the script returned from the API that the outputSchema doesn't declare. If you need them, re-run with output validation skipped.
  • { skipped: true } — validation was bypassed; data is the raw, unchecked script output.

Reading dropped fields / skipOutputDataValidation. To receive the raw, unvalidated result, opt out of output validation (the exact syntax differs by shape — see the reference you loaded above). Input validation is never skipped.

Trimming the result / filterOutputData. To shrink a large result down to the fields you need, pass a jq expression that post-processes data (again, exact syntax per shape). The jq runs against data only, NOT the { data, meta } envelope, so write it rooted at data (run the script's --help — or your shape's equivalent — to see its output schema). The transformed value replaces data, meta is preserved, and the result is NOT re-validated against the output schema.

References

Load the matching reference file before working in that area: