record_experiment_event
[SUPPORT] 3f6b8715 — manually record an experiment_events row (dead_end|pivot|breakthrough|note|milestone). Separate from, and coexists freely alongside, the auto-skeleton events start_experiment_run/complete_experiment_run/promote_experiment_run/expire_stale_runs write unconditionally — this is ...
This record as markdown: /tools/io-github-ajc3xc-meridian/record-experiment-event.md
What record_experiment_event does on Meridian
AI agents call record_experiment_event to permanently remove resources in Meridian, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
| Parameter | Type | Required | Description |
|---|---|---|---|
body | string | — | |
label | string | — | |
run_id | string | — | Optional — omit for an experiment-level event not tied to one run. |
event_type | string | Yes | |
project_id | string | — | |
session_id | string | — | |
artifact_ids | array | — | |
project_name | string | — | Project name — an alternative to project_id; resolved to the id internally. project_id wins if both are given. |
experiment_id | string | Yes |
Parameters from the server's own tool schema.
Why record_experiment_event is rated Critical
An AI agent that decides to call record_experiment_event doesn't hesitate, doesn't double-check, and doesn't stop at one. Whatever it removes from Meridian is gone. There is no undo for destructive operations.
Risk signalsAccepts raw HTML/template content (body) · Bulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
The rule that runs record_experiment_event safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Meridian, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For record_experiment_event, this is the rule to start with:
record_experiment_event is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Meridian, apply this rule, and every record_experiment_event call is checked against it from then on.
Questions about record_experiment_event
[SUPPORT] 3f6b8715 — manually record an experiment_events row (dead_end|pivot|breakthrough|note|milestone). Separate from, and coexists freely alongside, the auto-skeleton events start_experiment_run/complete_experiment_run/promote_experiment_run/expire_stale_runs write unconditionally — this is the enrichment path for everything else worth recording. Persistent-state disclosure: on hosted Meridian, supplied text and project/session metadata -- including task log entries, pinned decisions, sprint items, notes, handoff/goal state, and HITL queue items -- are sent to and stored in Meridian's service, in an isolated per-tenant Postgres database (Neon); self-hosted deployments keep the same categories in the configured local SQLite/Postgres database. This data is visible in the dashboard and API, and may resurface in later project context or handoffs. Notes and pinned decisions can be deleted individually; task log entries and sprint items can be deleted via the dashboard/API (not exposed as an agent-facing tool); HITL queue items and handoff state have no per-record delete. Full removal of any of this data is available via project or account deletion, using the documented controls. Do not include secrets. It is categorised as a Destructive tool in the Meridian MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
record_experiment_event accepts 9 parameters: body, label, run_id, event_type, project_id, session_id, artifact_ids, project_name, experiment_id. Required: event_type, experiment_id. The full parameter table on this page comes from the server's own tool schema.
Register the Meridian MCP server in PolicyLayer and add a rule for record_experiment_event: 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 Meridian. Nothing to install.
record_experiment_event is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the record_experiment_event 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 record_experiment_event. 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.
record_experiment_event is provided by the Meridian MCP server (@meridianmcp/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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