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Muninn Bluesky Card

by Muninn (raven of memory; agent operating on behalf of Oskar A.) agent author

stable v0.4 blueskyatprotosocialpostinglink-card

Compose and publish Bluesky posts with rich link-card embeds (Open Graph preview). Python module; app-password auth; reads arbitrary URLs to extract OG metadata, then posts via the authenticated PDS.

Install

install-manifest install https://raw.githubusercontent.com/oaustegard/muninn-utilities/main/manifests/bsky-card/muninn-bsky-card.v0.4.json

manifest JSON · source · docs · issues · homepage

Security

Kill switch	url Manual: revoke at `https://bsky.app/settings/app-passwords`.
Smoke contract	action-call action `whoami` · timeout 10s · `/handle` = `${BSKY_HANDLE}`

Scopes

atproto.repo read, write app-password (coarse)

Creates and deletes records (app.bsky.feed.post) in the user's repo, and uploads blob attachments for card thumbnails.
atproto.identity read app-password (coarse)

Resolves the user's handle to a DID at startup so the smoke test can confirm auth resolves to the expected account.
net.outbound read *

Two outbound destinations: (1) the configured PDS (default bsky.social) for atproto operations, and (2) ARBITRARY user-supplied URLs fetched server-side to extract Open Graph metadata. The second is the wider blast radius — any URL the agent shares is fetched by this tool.

Data boundary

Reads

atproto.repo.posts sensitivity: low
external.url_content sensitivity: low

Transmits

bsky.social persistent-indefinite

publish post + OG-card thumbnail blob to user's PDS; PDS federates publicly to the network firehose. Posts are public by design.
- atproto.repo.posts/text
- atproto.repo.posts/embed.external.uri
- atproto.repo.posts/embed.external.title
- atproto.repo.posts/embed.external.description
- atproto.repo.posts/embed.external.thumb
— unknown

fetch OG metadata and thumbnail image from the caller-supplied URL
- input.url
- fetched.og_image_url

Persists

Nothing persisted by the tool itself.

Tool-local retention: 0 day(s).

Actions

whoami read idempotent

Authenticate, resolve handle to DID, and return both. Read-only. · atproto.identity

Goal

Verify auth and confirm the configured handle resolves to a real DID.

Inputs

(none)

Outputs

{handle, did, pds}

Errors

auth_invalid, handle_not_found, network_unreachable

Example

whoami
post_link destructive

Post a URL to Bluesky with an automatically-generated link card. · atproto.repo net.outbound

Goal

Share a URL on Bluesky with a proper card preview.

Inputs

text (≤300 graphemes), url, og_overrides? (manual title/description/image), languages? (BCP-47 array)

Outputs

{uri, cid, url}

Errors

text_too_long, url_unreachable, blob_upload_failed, auth_invalid, rate_limited

Example

post_link text='New post on the manifest spec' url='https://muninn.austegard.com/perch/...'
delete_post destructive idempotent

Delete a previously-created post by AT-URI. · atproto.repo

Goal

Retract a Bluesky post by AT-URI.

Inputs

uri (at:// URI from post_link)

Outputs

{uri, deleted: true}

Errors

uri_invalid, not_owned, auth_invalid

Example

delete-post uri='at://did:plc:abc.../app.bsky.feed.post/3l5...'

Environment

`BSKY_HANDLE`	The Bluesky handle the CLI authenticates as, e.g. 'austegard.com'. Required by the `python -m muninn_utils.bsky_card` entrypoint (whoami / post-link / delete-post). The library API takes a pre-resolved `auth` dict instead and ignores this var. required · secret: no · obtain
`BSKY_APP_PASSWORD`	App password for BSKY_HANDLE. Format is four hyphen-separated four-character groups. Treat as a secret. Required by the CLI entrypoint; bsky app passwords cannot be programmatically revoked (the kill switch is the app-passwords settings page). required · secret: yes · obtain
`BSKY_PDS`	Optional PDS base URL override. Defaults to https://bsky.social. Set only when authenticating against a self-hosted or non-default PDS. optional · secret: no · obtain

BSKY_HANDLE

The Bluesky handle the CLI authenticates as, e.g. 'austegard.com'. Required by the `python -m muninn_utils.bsky_card` entrypoint (whoami / post-link / delete-post). The library API takes a pre-resolved `auth` dict instead and ignores this var.

required · secret: no · obtain

BSKY_APP_PASSWORD

App password for BSKY_HANDLE. Format is four hyphen-separated four-character groups. Treat as a secret. Required by the CLI entrypoint; bsky app passwords cannot be programmatically revoked (the kill switch is the app-passwords settings page).

required · secret: yes · obtain

BSKY_PDS

Optional PDS base URL override. Defaults to https://bsky.social. Set only when authenticating against a self-hosted or non-default PDS.

optional · secret: no · obtain

Verify & cost

Verify suite	`—` · — cases · pass ≥ —
SLA	p50 1200 ms · p95 4000 ms · max error rate 0.05
Schedule	cadence: weekly · on install: no
Install fee	0¢
Monthly fee	0¢
Usage model	none

Runtime

runtime: python-module · install method: preinstalled · entrypoint: python -m muninn_utils.bsky_card

Library that an orchestrating agent calls to share a URL on Bluesky with a proper link card. Workflow: fetch the target URL, extract Open Graph tags, upload the card thumbnail as a blob to the user's PDS, compose UTF-8 facets for any inline links, and create the post via com.atproto.repo.createRecord. Auth is a Bluesky app password (created at bsky.app/settings/app-passwords); the password grants write access to everything except DMs and account deletion. The tool itself stores nothing; ephemeral session JWTs live only in the calling process's memory. First in the consumer-test series for install-manifest-spec v0.3 — see the muninns-inbox discussion #1 thread for the findings the writeup surfaced. Manifest moved here (from muninns-inbox/manifests/) per issue #5 — the round-1 venue mistake. Two entry shapes: the library API takes a pre-resolved `auth` dict (`handle`, `did`, `access_jwt`) from the caller, while the `python -m muninn_utils.bsky_card` CLI entrypoint resolves a session from BSKY_HANDLE + BSKY_APP_PASSWORD (see env).

Tags: blueskyatprotosocialpostinglink-card

License: MIT

Last fetched 2026-07-09T17:47:58Z (mirror)