feat(mcp): read-only getState tool (portable read-side hedge)#46
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Completes the read side started by the resources projection. MCP resources are
the correct read side but the least-supported MCP primitive (some hosts — e.g.
Cursor — are tools-only); a getState TOOL is the portable hedge that works on any
tools-capable host, including a direct Anthropic/Vercel tool projection
(research-11 §3.2, "ship both"). Directly serves reelee-web, which consumes
buildToolsList to feed Anthropic tools (not MCP).
- Pure (resources.ts): buildGetStateTool(views, opts) → a wire-safe
(app_getState default) readOnlyHint tool descriptor whose `view` param
enumerates the listed view ids; callGetState(views, args) reads the view as
errors-as-data (invalid view → isError; unknown/internal → null).
- Server: createMcpServer(registry, { views, getStateTool: true }) merges the
tool into tools/list and routes it in tools/call. Default off; requires views.
Fully backward-compatible.
- McpToolDescriptor gained an optional `annotations` field (readOnlyHint etc.);
the getState tool sets it. Command-tool projection unchanged.
- +5 tests (28 in the package); typecheck + build + workspace green.
Docs: README getState section; acture-mcp + acture-ai-assistant skills note the
shipped tool; roadmap v1.16 entry. minor changeset (1.2.0 → 1.3.0).
Claude-Session: https://claude.ai/code/session_016teVFousRsWNhiiPNpG1p9
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What & why
Completes the AI read side started by the resources projection (#44). MCP resources are the correct read side but the least-supported MCP primitive — some hosts (e.g. Cursor) are tools-only. A
getStatetool is the portable hedge that works on any tools-capable host, including a direct Anthropic/Vercel tool projection (research-11 §3.2, "ship both").This directly serves the named consumer reelee-web, which consumes
buildToolsListto feed Anthropic tools (not MCP) — so a puregetStatedescriptor slots straight into its flow.Changes
resources.ts):buildGetStateTool(views, opts)→ a wire-safe (app_getStatedefault,^[a-zA-Z0-9_-]{1,64}$),readOnlyHinttool descriptor whoseviewparam enumerates the listed view ids;callGetState(views, args)→ errors-as-data (invalidview→isError; unknown/internal view →null).createMcpServer(registry, { views, getStateTool: true })merges the tool intotools/listand routes it intools/call. Default off; requiresviews. Backward-compatible.McpToolDescriptorgained an optionalannotationsfield (readOnlyHint/destructiveHint/idempotentHint/openWorldHint); the getState tool sets it. Command-tool projection unchanged (deriving annotations from a command side-effect class stays deferred with the confirmation-gate work).Docs
README getState section;
acture-mcp+acture-ai-assistantskills note the shipped tool; roadmap v1.16.minorchangeset (acture-mcp-server1.2.0 → 1.3.0).Still deferred
The keymap-customization helper (second v1.14 accelerator) and the
sideEffect/requiresConfirmationclosed-surface question.https://claude.ai/code/session_016teVFousRsWNhiiPNpG1p9