Save a web link to a Capacities space with optional title and tags
AI agents use capacities_save_weblink to create or update resources in Capacities MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Capacities MCP Server environment.
This tool creates new data (weblinks) in the user's Capacities space, which is a reversible write operation. It does not execute arbitrary code, delete data, or involve financial transactions. The severity is medium rather than low because saving content could overwrite or pollute important knowledge bases if misused by an agent, but the impact is limited to that specific space and can be undone.
From the tool's definition Tool name 'capacities_save_weblink' and description 'Save a web link to a Capacities space with optional title and tags' indicates the tool creates or adds new content (a weblink with metadata) to a knowledge management system.
Documented attack patterns abuse exactly the kind of access capacities_save_weblink gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Capacities MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for capacities_save_weblink:
{
"version": "1",
"default": "deny",
"tools": {
"capacities_save_weblink": {
"limits": [
{
"counter": "capacities_save_weblink_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}capacities_save_weblink 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.
Free to start. No card required.
Save a web link to a Capacities space with optional title and tags. It is categorised as a Write tool in the Capacities MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Capacities MCP Server MCP server in PolicyLayer and add a rule for capacities_save_weblink: 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 Capacities MCP Server. Nothing to install.
capacities_save_weblink 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 capacities_save_weblink 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 capacities_save_weblink. 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.
capacities_save_weblink is provided by the Capacities MCP Server MCP server (jem-computer/capacities-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Capacities MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
6 Capacities MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.