asc_post_marketplace_webhook
POST /v1/marketplaceWebhooks — both attributes required: endpointUrl (wire key — Swift endpointURL, pinned by tests) + secret (HMAC signing key, WRITE-ONLY — store it on the receiving side first; rotatable via PATCH).
This record as markdown: /tools/io-github-akoskomuves-appstoreconnect-mcp/asc-post-marketplace-webhook.md
What asc_post_marketplace_webhook does on Appstoreconnect Mcp
AI agents use asc_post_marketplace_webhook to create or update resources in Appstoreconnect Mcp, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Appstoreconnect Mcp environment.
Why asc_post_marketplace_webhook is rated Medium
This tool creates a new webhook configuration on App Store Connect, which is a reversible state modification. While webhooks can trigger external actions, the tool itself is registering/writing a configuration resource rather than executing arbitrary code.
From the tool's definition POST /v1/marketplaceWebhooks creates a new webhook resource with endpointUrl and secret attributes. The description explicitly mentions it is WRITE-ONLY and rotatable via PATCH, confirming it creates and modifies webhook configuration state.
Attacks that exploit this kind of access
The rule that runs asc_post_marketplace_webhook safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Appstoreconnect Mcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For asc_post_marketplace_webhook, this is the rule to start with:
asc_post_marketplace_webhook stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Appstoreconnect Mcp, apply this rule, and every asc_post_marketplace_webhook call is checked against it from then on.
Questions about asc_post_marketplace_webhook
POST /v1/marketplaceWebhooks — both attributes required: endpointUrl (wire key — Swift endpointURL, pinned by tests) + secret (HMAC signing key, WRITE-ONLY — store it on the receiving side first; rotatable via PATCH). It is categorised as a Write tool in the Appstoreconnect Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Appstoreconnect MCP server in PolicyLayer and add a rule for asc_post_marketplace_webhook: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Appstoreconnect Mcp. Nothing to install.
asc_post_marketplace_webhook is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the asc_post_marketplace_webhook rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for asc_post_marketplace_webhook. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
asc_post_marketplace_webhook is provided by the Appstoreconnect MCP server (@akoskomuves/appstoreconnect-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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