mcpx: natural language to script -- a sentence in, a reviewed script (or its result) out

Relocated from dezren39/darwin-nix#294 on 2026-10-28 (placement audit): mcpx's single source lives in developing-today/code (pkgs/mcpx); re-home tracked at #309. Original body below; issue references inside it are historical (dezren39/nix numbering).

mcpx is mostly a gateway, but one planned surface turns a sentence into a script against the configured servers.

Today mcpx prompt "<what you want>" matches a saved recipe or generates a script to review, governed by prompt.autonomy (decision 0002: off < advise < ask < propose < apply < run).

Wanted, as one declared feature across CLI, /v1, MCP and the plugin:

Script only: a sentence in, the script bytes out (typed against the generated client, type-checked), without running anything. This is the default at propose.
Run: the same, executed, with the result returned (at run, subject to the daemon's autonomy.max ceiling).
Where the model comes from must be stated: a caller-supplied model/provider, not MCP sampling (deprecated in 2026-07-28).
Generated scripts saved as recipes on request, so a repeated sentence becomes a recipe match instead of a regeneration.

Related: #112 (hooks), #113 (administration by intent), decision 0002.

Acceptance criteria

mcpx prompt "<sentence>" can return the generated script bytes without executing anything (script-only mode), typed against the generated client and type-checked before it is returned.
Run mode executes the same generated script and returns its result, gated by the caller's autonomy level and the daemon's autonomy.max ceiling.
The model/provider used for generation is caller-supplied and stated in the response; MCP sampling is not used.
A generated script can be saved as a recipe on request, and a later identical sentence matches the saved recipe instead of regenerating.
The feature behaves the same across the CLI, /v1, MCP, and plugin surfaces, with tests covering script-only vs run gating.

CODE-886

@dezren39

History carried over from dezren39/darwin-nix#294 (verbatim, oldest first):

@dezren39 · 2026-10-27T14:50:30Z

Intake review

Fleet-monitor intake pass (2026-10-27). Related: #112 (hooks), #113 (administration by intent), decision 0002 (autonomy ladder) — all cited in the issue. The body already specifies the four surfaces and the autonomy gating well; I appended acceptance criteria and normalized labels (kind/enhancement, priority/low, effort/l, app/mcpx).

Notes / risks: this is a design-level feature, not a bug — the caller-supplied model requirement (no MCP sampling, deprecated 2026-07-28) is the load-bearing constraint and should be settled before implementation. Suggested approach: land script-only mode first (it is the default at propose and the safest slice), then run mode behind the autonomy ceiling, then recipe saving.

@dezren39 · 2026-10-28T19:23:17Z

Triage verdict (task 2318): LARGELY IMPLEMENTED — one acceptance item fails and is routed.

Verified at developing-today/code main 35726e8e (mcpx source: pkgs/mcpx):

Script-only / run (acceptance 1–2): done. internal/cli/consumer.go:421 CmdPrompt takes --autonomy/--run; at propose the script Source is returned unexecuted, at run it executes, and a daemon-ceiling clamp is reported on stderr (Resolution.ClampedBy), with e2e coverage in internal/e2e/autonomy_test.go and ceiling_test.go. Generated scripts are validated before return (internal/cli/script_validate_test.go).
Recipes (acceptance 4): done. A sentence matches saved recipes first; a generated script carries Resolution.Save and the CLI prints 'keep it with mcpx recipes save <name> -'.
Model stated (acceptance 3, half): Resolution.Model is in the response shape.
Model caller-supplied, no sampling (acceptance 3, the failing half): not met. Client.Intent takes (prompt, autonomy, values, session) — no model/provider from the caller; the daemon's only provider config is its own repair.provider/repair.model settings (internal/daemon/consumer.go resolveProvider). And when no provider answers, generate() (daemon/consumer.go, 'generation by sampling', ~:605+) falls back to an MCP sampling request through the broker (elicit.SampleAsk) — the CLI even calls that the default state ('generated by sampling; review it before running'). Sampling is deprecated in 2026-07-28 and this issue's acceptance says it must not be used for generation.
Cross-surface parity (acceptance 5) is implemented through the shared intent path but I did not exhaustively verify plugin-surface tests this triage; the fix packet keeps the surfaces on the same path.

Routing: remainder enqueued as task 2644 (queue repo-health-nix-pilot, dedupe repo-health:v1:fix:dezren39/nix:issue:294): caller-supplied model/provider on the intent path (CLI flag + /v1 field), and remove the sampling fallback from generate() so no-provider returns the existing no-model resolution instead. This issue stays open for that remainder.

🤖 Agent note · parked

Agent: queue worker (repo-worker-code), Lane A shift
Session / ID: queue task 2904 (resume)
Found via: queue claim · repo-health-code-pilot
Task: Parked again on CI — PR mcpx prompt: caller-supplied model/provider on the intent path + remove the MCP sampling fallback from generate() (#1961) #2004 head 5db367d: 16/17 checks pass (mcpx test, all conformance client/server suites, spec parity, flake evaluation, treefmt); only mcpx conformance compare with the records remains QUEUED (queued since 00:35Z, unchanged through this shift's ~5-minute poll) — fleet runner stall, not a PR failure.
Expectation: Resume condition: compare with the records settles green → merge PR mcpx prompt: caller-supplied model/provider on the intent path + remove the MCP sampling fallback from generate() (#1961) #2004 and complete task 2904.
Links: PR mcpx prompt: caller-supplied model/provider on the intent path + remove the MCP sampling fallback from generate() (#1961) #2004

mcpx prompt: caller-supplied model/provider on the intent path + remo…

🤖 Agent note · done

Agent: queue worker (repo-worker-code), Lane B shift
Session / ID: queue task 2904
Found via: queue claim (resume of Lane A's parked work)
Task: mcpx prompt caller-supplied model/provider + remove MCP sampling fallback from generate() — complete
Expectation: Done: PR mcpx prompt: caller-supplied model/provider on the intent path + remove the MCP sampling fallback from generate() (#1961) #2004 squash-merged at 264ba11 with all 15 checks passing (mcpx test, conformance client/server suites, spec parity, compare-with-the-records, flake evaluation, treefmt). Per triage task 2861 this was the last failing acceptance item of mcpx: natural language to script -- a sentence in, a reviewed script (or its result) out #1961 — script-only mode, run mode with daemon-ceiling clamp, recipe matching/saving and Resolution.Model were already verified done — so mcpx: natural language to script -- a sentence in, a reviewed script (or its result) out #1961's acceptance criteria are now fully met and the issue is closed.
Links: PR mcpx prompt: caller-supplied model/provider on the intent path + remove the MCP sampling fallback from generate() (#1961) #2004 · merge 264ba11

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mcpx: natural language to script -- a sentence in, a reviewed script (or its result) out #1961

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mcpx: natural language to script -- a sentence in, a reviewed script (or its result) out #1961

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developing-today commented on Oct 28, 2026

dezren39 commented on Oct 28, 2026

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dezren39 commented on Oct 29, 2026

dezren39 commented on Oct 29, 2026

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