CrabbitMQ
Server Details
Async message queue for AI agents. Self-provision queues, push/poll messages, no signup.
- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP
- URL
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Tool access control
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Managed credentials
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Usage analytics
See which tools your agents call, how often, and when, so you can understand usage patterns and catch anomalies.
Tool Definition Quality
Average 4/5 across 6 of 6 tools scored.
Each tool has a distinct purpose: creating a queue, deleting a message, listing queues, polling messages, pushing messages, and getting queue info. No two tools overlap in functionality.
All tool names follow a consistent verb_noun pattern using snake_case (e.g., create_queue, delete_message, poll_messages). Even queue_info fits the pattern as it describes an action on a resource.
Six tools is appropriate for a message queue server. It covers core operations without being too many or too few, providing a focused and manageable surface.
Missing delete_queue tool prevents deleting entire queues, which is a notable gap. Other operations (create, list, push, poll, delete messages, stats) are covered, but queue lifecycle management is incomplete.
Available Tools
6 toolscreate_queueAInspect
Provision a new message queue. Returns queue_id, push_token, and poll_token. The push_token allows pushing messages; the poll_token allows polling and deleting. Store these securely.
| Name | Required | Description | Default |
|---|---|---|---|
| name | No | Optional human-readable label for this queue. | |
| agent_key | Yes | Your unique agent identifier (API key). Used to enforce per-agent queue limits. Choose any stable identifier. | |
| webhook_url | No | Optional. HTTPS URL to POST to when a message is pushed to this queue. Payload: {queue_id, message_id, body}. Useful for event-driven agents that prefer push over polling. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description must disclose behavioral traits. It explains the return tokens and their purposes, but omits details about queue limits, error handling, or idempotency. The security note is helpful but insufficient for full transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is concise with two sentences that front-load the main action and return values. Every sentence adds value, and there is no redundancy.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the absence of annotations and output schema, the description covers the essentials but lacks details on constraints (e.g., duplicate names, agent_key validation) and potential side effects. It is adequate but not fully complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the input schema already documents all parameters. The description does not add extra meaning beyond the schema, so it meets the baseline of 3.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool's purpose with specific verb ('provision') and resource ('new message queue'). It distinguishes itself from sibling tools like delete_message, list_queues, etc., which handle different operations.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No explicit guidance on when to use this tool versus alternatives. While the creation context is clear, there is no mention of prerequisites or scenarios where it should not be used. The description is adequate but lacks explicit instructions.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
delete_messageAInspect
Acknowledge and delete a message after processing. Required to prevent redelivery.
| Name | Required | Description | Default |
|---|---|---|---|
| queue_id | Yes | Your queue ID. | |
| message_id | Yes | The message ID to delete. | |
| poll_token | Yes | The poll_token for this queue. |
Tool Definition Quality
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 correctly labels the tool as destructive ('delete') and explains that it prevents redelivery. It could add more detail about idempotency or error handling but is adequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences, no wasted words, front-loaded with the action and purpose. Every sentence earns its place.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's complexity (3 required params, no output schema, no annotations), the description is complete enough. It covers purpose, usage context, and a key behavioral trait. Minor gaps exist (e.g., error behavior) but not critical.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the baseline is 3. The description does not add additional meaning beyond the parameter names and schema descriptions. It links the parameters to the action but provides no extra detail.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb (acknowledge and delete) and resource (a message), and it distinguishes from sibling tools like push_message or poll_messages by specifying that it is used after processing to prevent redelivery.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description says 'after processing' and 'Required to prevent redelivery,' which indicates when to use it. It doesn't explicitly exclude alternatives but provides clear context for its usage.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
list_queuesAInspect
List all queues owned by your agent key. Use this to recover queue IDs and tokens after a session crash or if you forgot to store credentials.
| Name | Required | Description | Default |
|---|---|---|---|
| agent_key | Yes | Your unique agent identifier (the same agent_key used when creating queues). |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must disclose behavior. It states the tool lists queues 'owned by your agent key', implying scoping. It does not mention destructive behavior (likely none), rate limits, or authorization beyond the parameter. For a read-only list operation, this is adequate but lacks depth.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is two sentences and very concise. It front-loads the main action and then provides the usage scenario. No unnecessary words.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple list tool with one parameter and no output schema, the description covers the purpose and common use case. It could mention what the output contains (e.g., queue IDs and tokens) but is not required. The context is sufficient for selection and invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema has 100% description coverage for the single parameter (agent_key). The description adds 'the same agent_key used when creating queues', which provides context beyond the schema's description. This is helpful for understanding which key to use.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states 'List all queues owned by your agent key', specifying the verb (list) and resource (queues). It distinguishes from siblings like create_queue and queue_info by focusing on listing owned queues. The additional use case 'recover queue IDs and tokens after a session crash' adds clarity.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description explicitly states when to use this tool: 'to recover queue IDs and tokens after a session crash or if you forgot to store credentials'. It implies usage for retrieval scenarios. However, it does not provide explicit when-not-to-use or alternatives, which are not critical for this simple tool.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
poll_messagesAInspect
Retrieve pending messages from your queue. Returns all messages not yet deleted, ordered oldest-first. Messages are NOT auto-deleted on poll — call delete_message after processing.
| Name | Required | Description | Default |
|---|---|---|---|
| queue_id | Yes | Your queue ID. | |
| poll_token | Yes | The poll_token for this queue. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations exist, so the description fully bears the burden. It critically discloses that messages are NOT auto-deleted, which is essential for correct usage. Ordering is also mentioned.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences, no wasted words. The first sentence states purpose, the second adds a critical behavioral note. Perfectly front-loaded.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
No output schema exists, but the description does not explain the response format (e.g., message structure). For a polling tool, this information could be helpful. Otherwise, the description covers the core behavior adequately.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the schema already describes queue_id and poll_token. The description adds no additional meaning beyond what's in the schema, meeting the baseline.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool retrieves pending messages from a queue, with explicit ordering (oldest-first). This distinguishes it from siblings like delete_message, push_message, and queue management tools.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides clear usage context: retrieve messages and then call delete_message after processing. It doesn't explicitly state when not to use or name alternative tools, but the procedural note is valuable.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
push_messageAInspect
Push a message to a queue. Requires the push_token for that queue. Default TTL is 24 hours; set ttl_seconds for a shorter or longer expiry (max 7 days). Limit: 1000 messages/queue/day.
| Name | Required | Description | Default |
|---|---|---|---|
| body | Yes | Message content. Max 64KB. Can be JSON, plain text, or any string. | |
| queue_id | Yes | The queue ID to push to. | |
| push_token | Yes | The push_token for this queue. | |
| ttl_seconds | No | Optional. How long the message lives before expiring (1–604800 seconds). Default: 86400 (24h). |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden. It discloses TTL defaults and limits, and rate limits. However, it does not specify return value, error conditions, or whether the operation is idempotent, leaving some behavioral aspects unclear.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is two sentences, front-loaded with the core action, and includes all key constraints without fluff. Every sentence provides essential information.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given no output schema and 4 parameters, the description covers key constraints (TTL, rate limit, required token). It does not describe the output or error scenarios, but for a push action these are often inferred. It is sufficiently complete for most agents.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% (baseline 3). The description adds meaningful context for 'ttl_seconds' (default and max) and reiterates the requirement for 'push_token'. This provides value beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action ('Push a message to a queue') and the resource (message to a queue). It distinguishes itself from siblings like 'create_queue' (creates queue) and 'poll_messages' (retrieves messages) by focusing on pushing.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides clear context: requires push_token, default TTL, max expiry, and a rate limit (1000/day). It does not explicitly state when not to use or compare to alternatives, but the context is sufficient for an agent to decide.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
queue_infoAInspect
Get stats for a queue: current depth, messages sent today, and rate limit status.
| Name | Required | Description | Default |
|---|---|---|---|
| queue_id | Yes | The queue ID. | |
| push_token | Yes | The push_token OR poll_token for this queue. |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden. It correctly implies a read-only operation via 'Get stats', but does not explicitly state it is non-destructive, nor does it mention authentication, rate limits, or potential side effects. Adequate but minimal.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Single sentence, no fluff, effectively front-loaded with the action and key outputs. Every word contributes.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Despite no output schema, the description lists the three specific stats returned, covering exactly what the agent needs to know. For a simple monitoring tool, this is sufficient.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% (both parameters have descriptions). The tool description adds no extra parameter semantics beyond the schema, meeting the baseline for high coverage.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool retrieves stats for a queue, specifying exactly what stats: depth, messages sent today, and rate limit status. It distinguishes from siblings like create_queue or push_message by focusing on monitoring rather than mutation.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance on when to use this versus alternatives. The description does not mention use cases or when not to use it. Since sibling tools cover creation, deletion, listing, and messaging, the intended context is implied but not explicit.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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