chore(scripts): mcp-probe — drive oab-mcp directly, no desktop app - #11
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A tiny stdio driver for the oab-mcp core: initialize → tools/call, printing raw JSON-RPC and forwarding the core's stderr. Lets you debug credential / region / tool behavior in a fast terminal loop instead of build → download → click the .app. Point it at the core bundled in the shipped .app and vary AWS_PROFILE/AWS_REGION to reproduce credential drift in one shot. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Debug the
oab-mcpcore without the desktop app.scripts/mcp-probe.mjsspawns the core, runs the MCP handshake, calls a tool, and prints the raw JSON-RPC + the core's stderr — the same flow the Tauri bridge uses, so it hits the exact AWS credential/region resolution the app would.Why
The
deploy_listAccessDenied Brett hit was credential/region drift, not a missing IAM policy. Iterating on that through build→download→open-.app→read-log is slow. This probe turns it into a terminal loop: varyAWS_PROFILE/AWS_REGIONand see the result instantly.Verified live (ECS task role, cluster
oab)AWS_REGION=ap-east-2→isError:false, returnsmira+orcadeployments.AWS_REGION=ap-southeast-1→isError:true,AccessDeniedException … ecs:ListServices— the drift symptom, reproduced in one shot.Usage
AWS_PROFILE=brettchien AWS_REGION=ap-east-2 OAB_CLUSTER=oab \ node scripts/mcp-probe.mjs "/Applications/OAB Studio.app/Contents/MacOS/oab-mcp"No build needed on macOS — the
.appalready bundles a workingoab-mcp.Node-only, no deps. Independent of the desktop stack (#9/#10).
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