[bug] show-artifact does not return artifact source

[baggiiiie]

Executor version

1.6.7

How do you run Executor?

Desktop app (Cursor connected over MCP to the local desktop sidecar)

Operating system

macOS (Apple Silicon)

Integration involved

MCP artifact tools (list-artifacts, show-artifact, edit-artifact, create-artifact). Not a third-party integration.

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What happened

when an agent calls show-artifact, it only shows confirmation with a deep link:

Saved "personal GitHub PRs" as artifact art_smygdh2sj2mtju34jo.
This MCP client cannot display MCP Apps, so give the user this URL to open it:
http://localhost:4789/artifacts/art_smygdh2sj2mtju34jo

according to create-artifact skill "if you do not have the stored source, call show-artifact and edit from what it returns."

executor/packages/core/execution/src/skills.ts

Lines 132 to 134 in 5e4da2a

	"the retry from that rather than calling `show-artifact` again. If you don't have",
	"the source at all (the artifact came from `list-artifacts`), `show-artifact` once",
	"and edit from what it returns — never from memory.",

A follow-up edit-artifact with a non-matching oldText failed as expected (atomic, nothing saved). error:

edit-artifact rejected: Edit 1 of 1 matched nothing: its oldText does not appear in the current source. Copy oldText verbatim from the source, whitespace included .
Nothing was changed. The artifact's current source is in structuredContent.code — build the retry against it.

The model still did not receive structuredContent.code. Cursor-like hosts appear to ignore MCP structuredContent and only forward content[].text.

What you expected

1. show-artifact should return the stored component source so agent can at least have oldText for edit-artifact.

Steps to reproduce

1. run Executor 1.6.7.
2. agent callslist-artifacts, then show-artifact with one of the returned ids.
3. Read the tool result the model receives (not the web UI at /artifacts/:id).

Expected after step 3: the result text contains a Source: fenced block with the stored App component.

Actual: confirmation + localhost URL only. No source.

Workaround that did return source: GET http://localhost:4789/api/artifacts/<id> (authenticated to the local daemon). That is not the documented agent path.

Diagnostics / logs

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