AI agents call apps_manifest_validate to retrieve information from Slack without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Manifest validation is a read-only operation that checks a manifest against schema rules and reports validity status. It does not create, modify, delete, or execute any code or side effects. The tool only examines manifest structure and content to assess compliance with validation rules. This falls clearly into the Read category with low severity since validation has no impact on system state or data persistence.
From the tool's definition Tool name 'apps_manifest_validate' and description 'Validate an app manifest' indicate schema/syntax validation of existing manifest data without modification, deletion, or execution of code.
Attacks that exploit this kind of access
Validate an app manifest. It is categorised as a Read tool in the Slack MCP Server, which means it retrieves data without modifying state.
Register the Slack MCP server in PolicyLayer and add a rule for apps_manifest_validate: 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 Slack. Nothing to install.
apps_manifest_validate is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the apps_manifest_validate 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 apps_manifest_validate. 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.
apps_manifest_validate is provided by the Slack MCP server (karbassi/slack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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