MCP tools/list returns uncallable tool names for aliased services (events, apps-script, admin-reports)

[abhinavkale-dev]

When running gws mcp with a service alias (for example -s events), tools/list can return Discovery-prefixed names (workspaceevents_*) while tools/call validates service prefixes against configured aliases (events).

This makes a tool returned by tools/list fail in the same MCP session.

Environment

• gws (affected): 0.3.4 (./.local/bin/gws)
• gws (local fixed verification): ./target/debug/gws
• OS: macOS (Apple Silicon)
• MCP transport: stdio (gws mcp -s <services>)

Repro (before)

printf '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}\n' \
| ./.local/bin/gws mcp -s events | jq '.result.tools[] | select(.name=="workspaceevents_subscriptions_list")'

printf '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"workspaceevents_subscriptions_list","arguments":{}}}\n' \
| ./.local/bin/gws mcp -s events | jq '.'

Actual

tools/call fails with:

Service 'workspaceevents' is not enabled in this MCP session

Expected

Any tool name returned by tools/list should be callable in the same MCP session.

Additional Repros

Same pattern appears for:

• -s apps-script (script_* from list vs apps-script alias validation)
• -s admin-reports (admin_* from list vs admin-reports alias validation)

Likely Root Cause

In src/mcp_server.rs:

• build_tools_list prefixes tool names with Discovery doc name (doc.name)
• handle_tools_call validates parsed prefix against configured aliases (config.services)

So list and call use different namespaces for aliased services.

Suggested Fix

In src/mcp_server.rs, make tools/list use the configured alias as prefix (same namespace used by tools/call).

Current line in build_tools_list:

• walk_resources(&doc.name, &doc.resources, &mut tools);

Proposed change:

• walk_resources(svc_name, &doc.resources, &mut tools);

This makes -s events return events_* tool names, consistent with tools/call validation.

Verification (after local fix)

printf '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}\n' \
| ./target/debug/gws mcp -s events | jq '.result.tools[] | select(.name=="events_subscriptions_list")'

printf '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"events_subscriptions_list","arguments":{}}}\n' \
| ./target/debug/gws mcp -s events | jq '.'

Observed:

• tools/list returns events_subscriptions_list
• namespace mismatch error is gone
• call proceeds to normal API/auth checks (any remaining errors are separate, e.g. scopes/API enablement)