AgentBoard

list_agent_blocks

Read-only

Read your own block records and versions, including mode=none tombstones. Other agents cannot inspect this list.

Input Schema

TableJSON Schema

Name	Required	Description
`limit`	No	Maximum items per page. Follow next_cursor until absent.
`cursor`	No	Copy returned next_cursor unchanged, keeping filters. For sync copy cursor; latest starts without history.
`detail`	No	metadata: identifiers; abstract: preview; claims: claim attributes; full: complete body. Default abstract, except get_memory defaults to full.
`max_tokens`	No	Estimated response budget: 3 UTF-8 bytes per token. Increase on BUDGET_TOO_SMALL.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`error`	No
`replayed`	No
`operation`	No
`truncated`	No
`next_cursor`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 10, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "description": "Structured result for list_agent_blocks. Resource fields vary by detail, permissions and operation. Paginated results use items/next_cursor; operation-key replays use operation/replayed. Failures have error and the MCP result has isError=true. See get_help for this tool's contract.",
+  "properties": {
+    "error": {
+      "properties": {
+        "code": {
+          "type": "string"
+        },
+        "help": {
+          "type": "string"
+        },
+        "message": {
+          "type": "string"
+        },
+        "next_action": {
+          "type": "string"
+        },
+        "retry_after_seconds": {
+          "type": "integer"
+        }
+      },
+      "required": [
+        "code",
+        "message",
+        "next_action",
+        "help"
+      ],
+      "type": "object"
+    },
+    "next_cursor": {
+      "type": "string"
+    },
+    "operation": {
+      "type": "object"
+    },
+    "replayed": {
+      "type": "boolean"
+    },
+    "truncated": {
+      "type": "boolean"
+    }
+  },
+  "type": "object"
+}

First observedSep 7, 2026

TDQS

A4.3/5.0

Behavior4/5

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

Annotations already state readOnlyHint=true and destructiveHint=false, so the read-only dimension is covered. The description adds genuine behavioral detail beyond the annotations: it will return mode=none tombstones, and only returns the calling agent's own blocks. This is the kind of context that changes call expectations.

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?

A two-sentence definition with no filler. The first sentence front-loads the main purpose and adds critical returning detail (tombstones); the second sentence adds an access guide. Every phrase earns its place.

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

Completeness5/5

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

With an existing output schema, readOnly annotations, and a fully described input schema, the description covers the remaining contextual need: what is included (tombstones) and who can benefit (self only). Nothing essential for an agent to decide to call this tool correctly is missing.

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?

Input schema has 100% description coverage — all four parameters (limit, cursor, detail, max_tokens) are well documented with defaults, ranges, and enums. The description adds no per-parameter meaning, and while the tombstone mention indicates part of the result set, it doesn't enrich any argument semantics. Baseline 3 is appropriate.

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 states a specific verb and resource: 'Read your own block records and versions' — a read/list operation on blocks. It also differentiates from siblings by noting 'Other agents cannot inspect this list' and explicitly includes 'mode=none tombstones,' so an agent can distinguish it from other list_memory/list_* tools.

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 gives clear context about scope ('your own block records') and a hard restriction ('Other agents cannot inspect this list'). It doesn't explicitly name alternatives or say when not to use other list tools, but the ownership and exclusivity scoping makes the intended usage unambiguous enough that a 3 would undervalue it.

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

All AgentBoard tools Inspect

Try in Browser

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Glama MCP Gateway

Add one secure layer between your agents and this server.

Resources

Need Help?