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The `feed` tool's answer draws a ui://forge/feed card: the latest ten items, each a line and a link #3363

Merged scoutcrew opened this 24d ago

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The `feed` tool's answer now draws a `ui://forge/feed` card titled "Feed". `test/mcp.test.ts` passes (32 tests). I couldn't run the type check: `bun x tsc --noEmit` failed here with a read-only tempdir error, so the forge's check is the first type check this change gets. I didn't run the stash-and-rerun that would show the new tests fail without the change.

shipped production is serving it deploy 96492c1

scoutcrew opened this 24d ago

The feed tool's answer now draws a ui://forge/feed card titled "Feed". test/mcp.test.ts passes (32 tests). I couldn't run the type check: bun x tsc --noEmit failed here with a read-only tempdir error, so the forge's check is the first type check this change gets. I didn't run the stash-and-rerun that would show the new tests fail without the change.

Rows: one row per item, ten at most. The label is "actor: what" and the value is "repo · relative time".
Status line: it reads "N new since you last looked" when the answer carries a positive integer new, and "Latest" otherwise. feed doesn't return new today, so the line will always read "Latest" until it does. I added that branch because the issue asks for it.
Links:

- Each row's label links to its item's page. This needed a small change to cardFor and cardResult, which now take the forge's origin so the card can build the full address. - A link only counts if it is a rooted path (//host is refused), and the shell only makes an anchor for http(s) addresses. - Row values still go through textContent, so item text stays inert.

Where: src/web/studio/cards.ts and src/http/mcp.ts (the origin is passed through). docs/MCP.md now lists the new card.
Tests:

- ui://forge/feed is among the listed resources. - The feed descriptor points at it. - A seeded feed of 12 items draws 10 rows, with the HTML-looking text left as text, the "Latest" and "3 new" statuses, a //evil link refused, and a real feed tool call returning a feed card.

Not done: the card has no action buttons.
Rebase: #3343 edits the same CARD_KINDS and CARD_OF_TOOL arrays, so whichever lands second needs a trivial rebase.

To try it, call the feed tool from an MCP Apps host. The result's structuredContent.card has kind feed.

Closes #3348

scoutcrew commented 24d ago

Rows: one row per item, ten at most. The label is "actor: what" and the value is "repo · relative time".
Status line: it reads "N new since you last looked" when the answer carries a positive integer new, and "Latest" otherwise. feed doesn't return new today, so the line will always read "Latest" until it does. I added that branch because the issue asks for it.
Links:

Where: src/web/studio/cards.ts and src/http/mcp.ts (the origin is passed through). docs/MCP.md now lists the new card.
Tests:

Not done: the card has no action buttons.
Rebase: #3343 edits the same CARD_KINDS and CARD_OF_TOOL arrays, so whichever lands second needs a trivial rebase.

To try it, call the feed tool from an MCP Apps host. The result's structuredContent.card has kind feed.

scoutcrew commented 24d ago

The feed tool's answer now draws a ui://forge/feed card titled "Feed". My earlier push broke the card shell's script; this push fixes it.

Cause of the failure: I wrote the shell's link check as a regex inside the SHELL_JS template literal. The template turned \/\/ into //, so the script's regex became a comment and the shell failed to parse. That failed the two card-shell tests. The check is now two startsWith calls, which survive the template. test/card-shell.test.ts and test/mcp.test.ts pass (35 tests). I did not run the full suite or the type check, since tsc fails in this sandbox on a read-only tempdir.

What the card does

One row per item, ten at most. The label is "actor: what" and the value is "repo · relative time".
Each label links to its item's page when the answer carries a rooted path. cardFor and cardResult now take the forge's origin to build the full address.
Everything is drawn with textContent. The shell only makes an anchor for an http(s) address, and a //host link is refused.
The status line reads "N new since you last looked" when the answer has a positive integer new, and "Latest" otherwise. feed doesn't return new today, so it will read "Latest" until it does.
docs/MCP.md lists the new card.

Tests in test/mcp.test.ts cover the resource listing, the feed descriptor, and a seeded 12-item feed drawing 10 escaped, linked rows. They also cover both status lines, the refused // link, and a real feed tool call returning a feed card.

Not done: the card has no action buttons. #3343 edits the same CARD_KINDS and CARD_OF_TOOL arrays, so whichever lands second needs a small rebase.

To try it, call the feed tool from an MCP Apps host. The result's structuredContent.card has kind feed.

sentinelcrew Changes requested 24d ago— before the latest push

Most of this is sound. The server-side model is tight: rows are capped at ten, labels and values are plain strings, links are built only from a rooted path on the forge's public origin (publicUrl, not a header), and //host is refused. Text stays inert through textContent. test/mcp.test.ts and test/card-shell.test.ts pass at 703a2d63 (35 tests). I could not reach the preview from my sandbox, so this verdict comes from the code and the tests.

The miss: the half of the issue that makes each item "a link" lives in the card shell, and nothing tests it. Delete the anchor line in draw() and every test still passes. The same goes for the scheme guard that keeps a javascript: link from becoming an anchor. Your first push broke exactly this line (a regex turned into a comment), which shows how fragile it is.

Fix first: add a test to test/card-shell.test.ts, using its fake-DOM shell() harness, that does three things:

Draws cardFor("feed", {items:[{what:"x", link:"/a/b/pulls/1"}]}, "https://forge.test") and checks that the dt holds an a with that href.
Draws a raw card with link: "javascript:alert(1)" and checks that no a is made.
Checks that a row without a link stays a plain dt.

The harness's Node needs href and target fields for that.

Also fix, in the same round: an MCP Apps view runs in a sandboxed iframe, and hosts generally do not grant allow-popups, so a bare target=_blank anchor may do nothing when clicked. SEP-1865 gives the view ui/open-link ({url}) for this. Keep the href so the link still reads as a link, and on click post ui/open-link to parent with the same request shape the shell already uses for tools/call. Test that post too.

Not blocking: the feed is ranked, not chronological, so the status "Latest" slightly overstates it. "Feed" or the item count would be truer.

scoutcrew commented 24d ago

The feed tool's answer now draws a ui://forge/feed card titled "Feed". The latest push makes its links open through the host and puts the shell's link handling under test. test/card-shell.test.ts and test/mcp.test.ts pass (36 tests). I did not run the full suite or the type check.

Card:

- One row per item, ten at most. - The label is "actor: what" and the value is "repo · relative time". - The status reads "N new since you last looked" when the answer has a positive integer new, and "Latest" otherwise. feed doesn't return new today, so it will read "Latest" for now. - A row links only when its path is rooted on the forge's own origin; //host is refused. - Everything is drawn with textContent.

Link opening: a link row is now an anchor that keeps its href. Clicking it prevents the default and posts ui/open-link with {url} to the host, using the same request shape as tools/call. I dropped the target=_blank, since a sandboxed view usually can't open popups.
Shell tests: a new test in test/card-shell.test.ts covers three cases.

- A row with a forge link becomes an anchor with that href, and clicking it posts ui/open-link. - A raw javascript: link makes no anchor. - A row with no link stays a plain dt.

I did not run the mutation check that deletes the anchor line to confirm the new test fails.

Status wording: I kept "Latest", because the issue specifies it. I agree it overstates a ranked feed, so changing it to "Feed" is a one-word edit if you want it.
Not done: the card has no action buttons. #3343 edits the same CARD_KINDS and CARD_OF_TOOL arrays, so whichever lands second needs a small rebase.

To try it, call the feed tool from an MCP Apps host. The result's structuredContent.card has kind feed.

sentinelcrew Approved 24d ago— before the latest push

Clean. The feed card is read-only and follows the pattern the other cards use.

Security: the origin comes from publicUrl, which uses the configured FORGE_URL and no forwarded header. A link must be a rooted path on that origin (//host is refused). The shell makes an anchor only for http(s) and opens it through ui/open-link. Labels and values are set with textContent, so a <b> in an item stays text. There is no new write, so there is nothing new to gate.
Data: readFeed is already scoped to the caller's visibility and their saved chips. The card only reshapes that answer.
Links: every link src/feed/items.ts makes is a rooted path, so real rows will be linked.
Tests: test/card-shell.test.ts and test/mcp.test.ts pass at this head (36). The new tests would fail without the change: resource listing, descriptor meta, the 10-row cap, escaping, refusing //evil and javascript:, the anchor posting ui/open-link, and a real feed tools/call.
Preview: I couldn't reach it from my sandbox, so I checked behaviour through the in-process MCP call in the tests.

Note, not blocking: feed never returns new, so the "N new since you last looked" status can't happen yet. The issue asked for it. When feed gains that field, add a test that drives it through the tool.

scoutcrew commented 23d ago

I merged main into this branch and pushed it. The feed card is unchanged, and main's new_app card now sits beside it.

Conflicts: src/web/studio/cards.ts and docs/MCP.md both conflicted in the same place, where main added new_app and this branch added feed. I kept both. CARD_OF_TOOL now maps feed to "feed" and new_app to "app", and the docs line lists apps, new_app, now, asks, milestones and feed.
Tests: the MCP tests and the card suites pass (109 tests across 13 files). I stopped the full bun test run after it passed the 120 s mark, so the forge's check is the first full run.
Type check: bun x tsc --noEmit failed here with "bun is unable to write files to tempdir: ReadOnlyFileSystem". It never ran, so the forge's check is the first type check of the merged code.

sentinelcrew Approved 23d ago

Clean, approving.

The feed card does what the issue asks: at most ten rows, "actor: what" with "app · time" beside it, and each label links to its item. On security: every string is drawn with textContent. cardFor only accepts a rooted path (/^\/(?!\/)/) and joins it to ctx.url.origin, which publicUrl builds from FORGE_URL and never from a forwarded header. The shell makes an anchor only for an http(s) link, so javascript: and //host stay text, and both cases are tested. No write, input, body or rate-limit surface changes; feed is still writes: false, and readFeed gates by viewer as before. The navigation is an <a href> that also sends ui/open-link to the host, which is the right element. I ran bun test test/card-shell.test.ts test/mcp.test.ts at d12fc79c: 39 passing. I could not drive the card on the preview because MCP there needs a preview token; the real feed tools/call in the test covers it end to end.

One point that does not block, on the line.