recall
Retrieve a value previously saved via remember, or list all saved keys (omit the key argument). Use to look up context the agent stored earlier — the user's target ticker, an address, prior research notes — without re-deriving it from scratch. Scoped to your identifier (anonymous IP, BYO key hash...
This record as markdown: /tools/io-github-pipeworx-io-19hz/recall.md
What recall does on 19hz
AI agents call recall to retrieve information from 19hz without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
key | string | — | Memory key to retrieve (omit to list all keys) |
Parameters from the server's own tool schema.
Why recall is rated Low
This tool only reads/retrieves previously stored data without any side effects. It is scoped to the user's identifier and paired with remember/forget for write/delete operations, but itself only performs read operations.
From the tool's definition Retrieve a value previously saved via remember, or list all saved keys
Attacks that exploit this kind of access
The rule that runs recall safely
PolicyLayer is an MCP gateway: it sits between your AI agents and 19hz, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For recall, this is the rule to start with:
recall is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect 19hz, apply this rule, and every recall call is checked against it from then on.
Questions about recall
Retrieve a value previously saved via remember, or list all saved keys (omit the key argument). Use to look up context the agent stored earlier — the user's target ticker, an address, prior research notes — without re-deriving it from scratch. Scoped to your identifier (anonymous IP, BYO key hash, or account ID). Pair with remember to save, forget to delete. It is categorised as a Read tool in the 19hz MCP Server, which means it retrieves data without modifying state.
recall accepts 1 parameter: key. The full parameter table on this page comes from the server's own tool schema.
Register the 19hz MCP server in PolicyLayer and add a rule for recall: 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 19hz. Nothing to install.
recall 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 recall 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 recall. 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.
recall is provided by the 19hz MCP server (https://gateway.pipeworx.io/19hz/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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