Mastodon
Server Details
Mastodon MCP — public Mastodon data via mastodon.social (no auth required)
- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP
- URL
- Repository
- pipeworx-io/mcp-mastodon
- GitHub Stars
- 0
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Tool Definition Quality
Average 3.7/5 across 9 of 9 tools scored. Lowest: 2.9/5.
The set mixes generic memory tools (ask_pipeworx, discover_tools, forget, recall, remember) with Mastodon-specific tools (get_account, get_timeline, get_trending, search). ask_pipeworx and discover_tools have overlapping purposes as tool discovery and querying, causing confusion. The Mastodon tools are distinct but the overall set blurs boundaries.
Tool names mix styles: 'ask_pipeworx', 'discover_tools' use verb_noun but 'forget', 'recall', 'remember' are single verbs. The Mastodon tools use consistent verb_noun (get_account, get_timeline, etc.), but overall the set lacks a uniform pattern, mixing imperative verbs and noun-first phrases.
9 tools is a reasonable count. The Mastodon subset (4 tools) covers basic operations, while the memory/discovery tools (5 tools) are separate. Not too many or too few for the apparent scope, though the two domains could be split.
The Mastodon tools cover reading public data (account, timeline, trending, search) but lack posting or interaction capabilities (e.g., create status, follow). The memory tools are complete for key-value storage. Overall, the server seems designed for querying only, so gaps are acceptable but notable.
Available Tools
9 toolsask_pipeworxAInspect
Ask a question in plain English and get an answer from the best available data source. Pipeworx picks the right tool, fills the arguments, and returns the result. No need to browse tools or learn schemas — just describe what you need. Examples: "What is the US trade deficit with China?", "Look up adverse events for ozempic", "Get Apple's latest 10-K filing".
| Name | Required | Description | Default |
|---|---|---|---|
| question | Yes | Your question or request in natural language |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations provided, but description fully discloses behavior: it picks the right tool, fills arguments, returns result. Implies it handles routing and argument inference, which is transparent.
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?
Concise, front-loaded with purpose, followed by examples. Every sentence adds value. Could be slightly shorter but no fluff.
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 simple schema (1 param, no output schema), the description is complete enough. Explains what happens internally (tool selection, argument filling) and provides examples. No output schema needed.
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% with a single parameter 'question' described as 'Your question or request in natural language'. The description adds examples of valid questions, but the schema already defines the parameter adequately.
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 answers natural language questions by selecting the best data source. It distinguishes itself from siblings by offering a unified interface over specialized tools like search or get_account.
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?
Provides clear guidance: just describe what you need in plain English, no need to browse tools. Includes concrete examples. However, does not explicitly state when not to use it or mention alternatives.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
discover_toolsAInspect
Search the Pipeworx tool catalog by describing what you need. Returns the most relevant tools with names and descriptions. Call this FIRST when you have 500+ tools available and need to find the right ones for your task.
| Name | Required | Description | Default |
|---|---|---|---|
| limit | No | Maximum number of tools to return (default 20, max 50) | |
| query | Yes | Natural language description of what you want to do (e.g., "analyze housing market trends", "look up FDA drug approvals", "find trade data between countries") |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations provided, so description carries the burden. It states it returns the most relevant tools with names and descriptions, which is clear. However, it doesn't mention any behavioral traits like whether it supports pagination, rate limits, or if it modifies state. With zero annotations, a higher score would require more behavioral detail.
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, all essential information. Could be slightly more structured, but it's efficient and front-loaded with purpose.
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 simple tool (search query, return list), the description covers purpose and usage. No output schema, but the description states what is returned (tool names and descriptions), which is sufficient. Slight deduction for not mentioning limit parameter behavior beyond default/max.
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 baseline is 3. Description does not add extra meaning beyond the schema's parameter descriptions. The query parameter's description already includes examples.
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 it searches a tool catalog by describing what you need, returning relevant tools with names and descriptions. It distinguishes itself by specifying it should be called first when many tools are available.
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?
Explicitly tells when to use: 'Call this FIRST when you have 500+ tools available and need to find the right ones.' No ambiguity about its role.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
forgetBInspect
Delete a stored memory by key.
| Name | Required | Description | Default |
|---|---|---|---|
| key | Yes | Memory key to delete |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries full burden. It states deletion but does not disclose consequences (e.g., irreversibility, authorization requirements, or whether an error occurs if key missing).
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 a single, front-loaded sentence that efficiently conveys the core purpose with no wasted 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?
Given the tool's simplicity (1 param, no output schema, no annotations), the description is minimal. It lacks information about return values, error handling, or prerequisites, leaving gaps for an AI agent.
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% and the schema already describes 'key' as 'Memory key to delete'. The description repeats 'by key' but adds no new meaning beyond the schema. Baseline 3 is appropriate.
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 uses a specific verb ('Delete') and resource ('stored memory'), and identifies the tool by key. It is concise and clearly distinguishes from siblings like 'remember' (store) and 'recall' (retrieve).
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 implies the tool is for deleting memories by key, but provides no guidance on when to use it versus alternatives, no prerequisites (e.g., key existence), and no exclusions.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_accountAInspect
Get a Mastodon account profile by ID (e.g., '109382839472938472'). Returns bio, follower/following counts, post history, and verification status.
| Name | Required | Description | Default |
|---|---|---|---|
| id | Yes | Numeric Mastodon account ID (e.g. "109302436954721982") |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description indicates the tool is a read-only operation ('Get'), which is consistent with the lack of annotations. It adds behavioral context by specifying 'public' and requiring a 'numeric account ID', which are important constraints not evident from the schema alone.
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 a single, well-formed sentence that conveys all necessary information without any extraneous words. It is front-loaded with the core action and resource.
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 simplicity (one parameter, no output schema, no annotations), the description is nearly complete. It explains what the tool does and what input is required, leaving no major gaps for the agent.
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 already has 100% coverage with a clear description for the 'id' parameter. The tool description adds no further parameter semantics beyond what the schema provides, so a baseline score of 3 is appropriate.
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 specifies the verb 'Get', the resource 'public Mastodon account profile', and the method of identification 'by numeric account ID'. This distinguishes it from sibling tools like 'get_timeline' and 'search'.
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 implies that the tool is for retrieving public profiles, which helps an agent decide when to use it versus other tools. However, it does not explicitly state when not to use it or mention alternatives.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_timelineBInspect
Get recent posts from the public Mastodon timeline. Returns statuses with authors, timestamps, engagement counts, and content.
| Name | Required | Description | Default |
|---|---|---|---|
| limit | No | Number of statuses to return (default: 20, max: 40) |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are present, so the description must disclose behavior. It indicates the tool retrieves recent posts but does not specify whether it is read-only, if authentication is needed, or any rate limits. The mention of 'mastodon.social' provides some context about the source.
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 a single concise sentence with no wasted words. It front-loads the action and resource effectively.
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 is adequate but lacks details like post format or whether results are paginated. Given the low complexity, it is minimally 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 coverage is 100%, so the description need not repeat parameter details. However, the description adds no extra meaning beyond the schema; it does not explain how 'limit' affects pagination or ordering.
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 ('get'), the resource ('posts'), and the source ('mastodon.social public timeline'), making the tool's purpose unambiguous. It distinguishes itself from sibling tools like 'get_account' and 'get_trending' by specifying the public timeline scope.
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 is provided on when to use this tool versus alternatives like 'search' or 'get_trending'. There is no mention of context for using the public timeline or any exclusions.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
get_trendingCInspect
Get currently trending posts on Mastodon. Returns popular statuses with engagement counts, authors, and trending tags.
| Name | Required | Description | Default |
|---|---|---|---|
| limit | No | Number of trending statuses to return (default: 10, max: 40) |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It does not state whether the tool is read-only, requires authentication, or any other behavioral traits.
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 a single, clear sentence with no unnecessary words. It is appropriately concise.
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 simplicity (one optional parameter, no output schema), the description is minimally adequate but lacks important context about the data format or any restrictions.
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 any additional meaning to the 'limit' parameter beyond what the schema already provides.
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 states the action ('Get'), the resource ('trending statuses'), and the instance ('mastodon.social'). It clearly indicates what the tool does, though it could differentiate it from siblings like 'get_timeline' more explicitly.
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 no guidance on when to use this tool versus alternatives like 'get_timeline' or 'search'. It does not mention any prerequisites or context.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
recallAInspect
Retrieve a previously stored memory by key, or list all stored memories (omit key). Use this to retrieve context you saved earlier in the session or in previous sessions.
| Name | Required | Description | Default |
|---|---|---|---|
| key | No | Memory key to retrieve (omit to list all keys) |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations provided, so description carries full burden. It states it retrieves a memory or lists keys, which is straightforward. Lacks details on behavior if key doesn't exist or on the format of returned data.
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 concise sentences, front-loaded with the core action, 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?
Given no output schema and no annotations, the description adequately explains the tool's functionality and usage context. Could mention return format or error behavior, but for a simple memory retrieval tool, it's 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 coverage is 100%, so the schema already describes the parameter. The description adds the nuance that omitting the key lists all memories, which is helpful but not extensive.
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?
Clearly states it retrieves a memory by key or lists all memories when key is omitted. The verb 'retrieve' and resource 'memory' are specific, and it distinguishes from siblings like 'remember' and 'forget'.
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?
Explains when to omit key (to list all) and provides context about retrieving previously saved information. Does not explicitly mention when not to use or alternatives, but the guidance is clear.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
rememberAInspect
Store a key-value pair in your session memory. Use this to save intermediate findings, user preferences, or context across tool calls. Authenticated users get persistent memory; anonymous sessions last 24 hours.
| Name | Required | Description | Default |
|---|---|---|---|
| key | Yes | Memory key (e.g., "subject_property", "target_ticker", "user_preference") | |
| value | Yes | Value to store (any text — findings, addresses, preferences, notes) |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses key behavioral traits: persistence differs by authentication, and anonymous sessions last 24 hours. This adds significant value beyond the input schema. However, it does not mention what happens if a key already exists (overwrite or error).
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 three sentences: first states the core function, second gives usage examples, third clarifies persistence. It is concise and front-loaded, though the third sentence could be seen as behavioral transparency detail.
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 simplicity (2 params, no output schema), the description covers the main points: what it does, when to use it, and persistence behavior. It does not explain return values, but no output schema exists. Slight gap on overwrite behavior, but otherwise 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 baseline is 3. The description does not add further meaning to parameters beyond what the schema provides; it only reiterates the storage purpose. The schema already describes key and value clearly.
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 stores a key-value pair in session memory, specifying the verb 'store', the resource 'key-value pair', and the scope 'session memory'. It also differentiates from siblings like 'forget' and 'recall' by indicating it saves data for later use.
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 explicit guidance on when to use the tool: 'save intermediate findings, user preferences, or context across tool calls'. It distinguishes usage based on authentication status (persistent vs. 24-hour memory), but does not explicitly mention when not to use it or mention alternatives.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
searchBInspect
Search Mastodon for accounts, statuses, or hashtags. Returns matching profiles, posts, and tags with follower counts and engagement metrics.
| Name | Required | Description | Default |
|---|---|---|---|
| type | No | Type of results: accounts, statuses, or hashtags (default: statuses) | |
| limit | No | Number of results to return (default: 10, max: 40) | |
| query | Yes | Search query string |
Tool Definition Quality
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries full burden. It discloses the search targets (accounts, statuses, hashtags) but does not describe behavioral traits like rate limits, pagination, or authentication needs. The description is adequate but not comprehensive.
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 a single sentence of moderate length, front-loading the purpose. It is concise but could be slightly improved by front-loading the key actions.
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 moderate complexity (3 parameters, no output schema), the description covers the basic purpose but lacks details on return format or behavior for different types. Completeness is adequate but not thorough.
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 baseline is 3. The description does not add any meaning beyond what the schema already provides for parameters like type and limit. It correctly states the search capability but no extra context.
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 states the tool searches Mastodon for accounts, statuses, or hashtags, which is a specific verb and resource. It distinguishes from siblings like get_account (which retrieves a single account) and get_timeline (which fetches a timeline), but could be clearer about the exact scope.
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 mentions searching on mastodon.social, but does not specify when to use this tool versus alternatives like get_account or get_timeline. No explicit when-not-to-use guidance is provided.
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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