Set default values that apply to all subsequent LCA tool calls. Reduces repetition - set database once, use everywhere. Defaults persist for 24 hours or until changed. Parameters: database: Default Ecoinvent database version (e.g., 'ecoinvent-3.9.1-cutoff') project_id: Default project UUID for cu...
Part of the Carbonfootprint server.
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AI agents use set_lca_session_defaults to create or modify resources in Carbonfootprint. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call set_lca_session_defaults repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Carbonfootprint.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"set_lca_session_defaults": {
"limits": [
{
"counter": "set_lca_session_defaults_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Carbonfootprint policy for all 5 tools.
These attack patterns abuse exactly the kind of access set_lca_session_defaults gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Set default values that apply to all subsequent LCA tool calls. Reduces repetition - set database once, use everywhere. Defaults persist for 24 hours or until changed. Parameters: database: Default Ecoinvent database version (e.g., 'ecoinvent-3.9.1-cutoff') project_id: Default project UUID for custom modeling tools Example: set_lca_session_defaults(database="ecoinvent-3.9.1-cutoff") # Now all tools use this database by default. It is categorised as a Write tool in the Carbonfootprint MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Carbonfootprint MCP server in PolicyLayer and add a rule for set_lca_session_defaults: 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 Carbonfootprint. Nothing to install.
set_lca_session_defaults 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 set_lca_session_defaults 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 set_lca_session_defaults. 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.
set_lca_session_defaults is provided by the Carbonfootprint MCP server (ecosemantic/carbonfootprint). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 Carbonfootprint tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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