Hedera Toolbox

hcs_monitor

Monitor HCS topic status and metadata on Hedera, including message count, creation time, memo, and recent activity. Costs 0.05 HBAR per query.

Instructions

Get current status and metadata of any HCS topic - message count, creation time, memo, and recent activity. Defaults to the HederaIntel platform topic. Costs 0.05 HBAR.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "api_key": "<api_key>"
    },
    "name": "hcs_monitor"
  }
}

Input Schema

Name	Required	Description	Default
`api_key`	Yes	Your HederaIntel API key
`topic_id`	No	Hedera topic ID (e.g. 0.0.8026796). Defaults to the HederaIntel platform topic.

Schema Changelog

Changes observed during successful MCP inspections.

First observedv3.4.5Mar 18, 2026

TDQS

A3.9/5.0

Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden. It discloses the cost (0.05 HBAR), which is useful behavioral context. However, it lacks details on permissions, rate limits, error handling, or response format, leaving gaps for a tool with no annotation coverage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is front-loaded with the core purpose, followed by key details (default topic and cost) in a single, efficient sentence. Every element (status/metadata listing, default, cost) earns its place without redundancy or fluff.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no annotations and no output schema, the description is moderately complete: it covers purpose, default behavior, and cost. However, for a tool with 2 parameters and no structured output, it lacks details on response format, error cases, or operational constraints, leaving room for improvement in contextual guidance.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents both parameters (api_key and topic_id) with descriptions. The description adds marginal value by mentioning the default for topic_id (HederaIntel platform topic), but does not provide additional syntax, format, or usage details beyond what the schema specifies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the specific verb ('Get') and resource ('current status and metadata of any HCS topic'), listing concrete attributes like message count, creation time, memo, and recent activity. It distinguishes from sibling tools like hcs_audit_trail, hcs_query, and hcs_write_record by focusing on status/metadata retrieval rather than historical analysis, querying, or writing operations.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides clear context for when to use this tool: to obtain status and metadata for HCS topics, with a default to the HederaIntel platform topic. However, it does not explicitly state when not to use it or name alternatives among siblings (e.g., hcs_query for different query types), missing explicit exclusions or comparisons.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.