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qbittorrent-readonly-mcp

by XiaotaoGuo

qBittorrent Read-only MCP

This is an independently maintained read-only MCP project for qBittorrent. It wraps qBittorrent Web API queries as local stdio MCP tools, enabling AI clients to perform real-time diagnostics directly.

Security Model

  • Supports stdio only; does not listen on any network port.

  • The qBittorrent address and API Key are read only from the environment or an external secrets file; MCP tool arguments cannot override the connection target.

  • Clients are only allowed to use a fixed set of GET endpoints; there are no generic request, URL, or endpoint tools.

  • No write tools are registered for adding, pausing, resuming, verifying, deleting, moving, changing trackers, or changing settings.

  • Full tracker URLs, passkeys, magnet links, cookies, and authentication information never appear in tool results.

  • The qBittorrent API Key itself still has full Web API permissions; read-only behavior is guaranteed by the service's two-layer allowlist and tests.

This MCP does not perform recursive file system scans; its scope is limited to real-time qBittorrent queries.

Related MCP server: Bitcoin Node MCP Server

Tools

  • get_health_summary: Version, speed, torrent status, and exception summary.

  • list_torrents: Filter torrents by status, category, minimum size, and days of inactivity.

  • get_torrent_details: Retrieve safe fields, files, and tracker hostnames by an Info Hash prefix of at least 8 characters.

  • list_problem_torrents: List torrents with missingFiles, errors, and stalled incomplete torrents.

  • analyze_largest_torrents: Analyze the Top N torrents by logical size.

Environment Requirements

  • Python 3.10+

  • uv

  • The following are expected to be present in a secrets file outside the project:

    • QBIT_URL

    • QBIT_API_KEY

By default, they are read from the process environment. Alternatively, you can pass only the path to the secrets file:

export QBIT_MCP_ENV_FILE="/path/to/secrets/nas-audit.env"

Do not copy the Key into this directory or into the Codex configuration.

Installation and Testing

cd /path/to/qbittorrent-readonly-mcp
uv sync
uv run pytest

Real read-only smoke test (outputs only tool names and redaction check results):

uv run python scripts/live_smoke.py \
  --env-file /path/to/secrets/nas-audit.env

Start locally:

QBIT_MCP_ENV_FILE="/path/to/secrets/nas-audit.env" \
  uv run qbittorrent-readonly-mcp

Once the service starts, it uses stdin/stdout to communicate via the MCP protocol; no ordinary interactive prompt is displayed.

Codex Configuration

Codex supports configuring a local STDIO MCP in a trusted project's .codex/config.toml. The following is an example configuration; only the secrets file path is passed here, and the API Key is not written into the configuration. The actual path should be maintained by the host project that uses this MCP:

[mcp_servers.qbittorrent_readonly]
command = "/path/to/qbittorrent-readonly-mcp/.venv/bin/qbittorrent-readonly-mcp"
args = []
cwd = "/path/to/qbittorrent-readonly-mcp"
enabled = true
required = false
startup_timeout_sec = 20
tool_timeout_sec = 60
default_tools_approval_mode = "auto"
enabled_tools = [
  "get_health_summary",
  "list_torrents",
  "get_torrent_details",
  "list_problem_torrents",
  "analyze_largest_torrents",
]

[mcp_servers.qbittorrent_readonly.env]
QBIT_MCP_ENV_FILE = "/path/to/secrets/nas-audit.env"

This repository does not store any Codex configuration or any credentials. Callers only need to reference this project's startup command and pass in the path to a secrets file located outside the project.

For Codex MCP configuration, refer to the OpenAI official documentation. The Python implementation uses the Model Context Protocol official Python SDK.

Development

Core layers:

MCP tools
  -> ReadOnlyQbitService(筛选、聚合、固定输出)
    -> QbitReadOnlyClient(固定 GET allowlist)
      -> qBittorrent Web API

Any new endpoint must first be added to READ_ONLY_ENDPOINTS, and tests must be added for “non-allowlist rejection” and “no leakage of sensitive fields”.

Available Tools

5 tools
analyze_largest_torrentsB
Read-onlyIdempotent

Return the largest torrents, optionally limited to a minimum inactivity age.

ParametersJSON Schema
NameRequiredDescriptionDefault
limitNo
inactive_daysNo

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

TDQS

B3.4/5.0
Behavior3/5

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

Annotations already communicate read-only, idempotent, and non-destructive behavior. The description adds useful selection semantics (size-based ordering and the inactivity-age filter) but does not disclose details such as how results are capped or ordered beyond the word 'largest'.

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 entire description is one front-loaded sentence with no filler. Every phrase contributes either the core behavior or the optional filter.

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

Completeness4/5

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

Given the simple two-parameter schema, the presence of an output schema, and annotations that cover safety/idempotency, the description covers the essential behavior. It is only missing explicit sibling differentiation and a more concrete statement of the limit parameter's effect.

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?

With 0% schema description coverage, the description must compensate, and it does clarify inactive_days as a 'minimum inactivity age'. However, the limit parameter is not explained; its meaning is only implied by the word 'largest' and the schema's default of 20.

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

Purpose4/5

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

The description uses a specific verb and resource: 'Return the largest torrents', with an optional inactivity-age filter. It uniquely identifies the tool's role among siblings through the 'largest' qualifier, though it does not explicitly contrast it with list_torrents.

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

Usage Guidelines2/5

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

No when-to-use or when-not-to-use guidance is provided, and no alternatives are named. An agent is left to infer that this should be chosen over list_torrents or list_problem_torrents based solely on the phrase 'largest torrents'.

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

get_health_summaryA
Read-onlyIdempotent

Return versions, transfer speeds, task state counts, and read-only problem summary.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

TDQS

A3.9/5.0
Behavior3/5

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

Annotations already establish readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the description does not need to repeat safety properties. It adds a little context with the list of returned aggregates, but no extra behavioral disclosures such as auth or failure modes.

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?

One compact sentence with a strong verb and a clear list of result categories. No redundant qualifiers or filler.

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?

For a parameterless read-only health summary with an output schema and full annotations, the description covers everything needed to invoke it. It does not need to elaborate on return layout since the schema exists.

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

Parameters4/5

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

There are zero parameters, so no parameter documentation is required; the schema coverage is effectively complete. The description's mention of returned fields avoids any need to compensate for parameter gaps.

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 opens with 'Return' and names versions, transfer speeds, task state counts, and a problem summary, making the resource and scope clear. The system-level content clearly separates it from torrent-scoped siblings like list_torrents and analyze_largest_torrents.

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

Usage Guidelines2/5

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

No when-to-use or alternative-selection guidance is given. The description only states what is returned; it does not say when to prefer get_health_summary over get_torrent_details or list_problem_torrents.

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

get_torrent_detailsA
Read-onlyIdempotent

Get safe details for one torrent using an 8+ character hexadecimal Info Hash prefix.

ParametersJSON Schema
NameRequiredDescriptionDefault
identifierYes

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

TDQS

A4.1/5.0
Behavior3/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds little behavioral detail beyond the hash-prefix input requirement; 'safe' is redundant with the annotations.

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?

One sentence with no filler. The primary action and scope are front-loaded, and the input format requirement is stated compactly.

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

Completeness4/5

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

The tool is simple: one parameter, clear annotations, and an output schema that can cover return values. The main missing piece is guidance on when to use this tool instead of siblings, but that is not critical for a single-parameter lookup.

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

Parameters5/5

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

Schema description coverage is 0%, so the description must explain the opaque 'identifier' parameter. It does so clearly by specifying that it is an 8+ character hexadecimal Info Hash prefix, giving the agent a precise format to validate against.

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?

Description clearly states a specific verb ('get'), a specific resource ('details for one torrent'), and the required input form ('8+ character hexadecimal Info Hash prefix'). It distinguishes itself from sibling list/analysis tools by emphasizing single-torrent scope.

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

Usage Guidelines3/5

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

The phrase 'for one torrent' implies the tool is appropriate when a single torrent's details are needed, but there is no explicit guidance about when not to use it or which sibling to prefer. Usage context is implied rather than stated.

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

list_problem_torrentsA
Read-onlyIdempotent

List missing, errored, unknown, or incomplete stalled/stopped torrents.

ParametersJSON Schema
NameRequiredDescriptionDefault
limitNo

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

TDQS

A3.7/5.0
Behavior3/5

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

The annotations already disclose readOnly, idempotent, and non-destructive behavior, so the description does not repeat that. It adds filtering scope, but provides no extra behavioral context such as pagination, ordering, or result size details beyond the schema's default limit.

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 a single, front-loaded sentence with no filler. It conveys the action and the precise inclusion criteria efficiently, making it easy for an agent to parse quickly.

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

Completeness4/5

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

For a low-complexity, read-only tool with no required parameters, an output schema, and clear annotations, the description is nearly complete. The main omission is guidance on the limit parameter, but the schema default and output schema mitigate the impact.

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

Parameters2/5

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

Schema description coverage is 0%, and the description says nothing about the 'limit' parameter. The parameter name and default value suggest the basic meaning, but the description does not clarify how limiting behaves, such as whether results are truncated or how a custom limit affects the response.

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 uses a specific verb, 'List', and identifies a distinct resource: problem torrents, explicitly naming the statuses included (missing, errored, unknown, or incomplete stalled/stopped). This clearly differentiates it from the generic sibling list_torrents.

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

Usage Guidelines3/5

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

The wording implies this tool is for finding torrents in problematic states, especially stalled or stopped ones, rather than for general listing. However, it does not explicitly mention sibling alternatives or state conditions for when this tool should not be used.

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

list_torrentsC
Read-onlyIdempotent

List torrents using local filters; no filter value is sent as an arbitrary API endpoint.

ParametersJSON Schema
NameRequiredDescriptionDefault
limitNo
stateNo
categoryNo
min_size_gibNo
inactive_daysNo

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

TDQS

C2.8/5.0
Behavior3/5

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

Annotations already cover the safety profile (readOnlyHint=true, idempotentHint=true, destructiveHint=false). The description adds that filters are applied locally, but the phrase 'no filter value is sent as an arbitrary API endpoint' is vague and potentially confusing. No contradiction with annotations.

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

Conciseness3/5

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

The description is brief and the main verb/resource is front-loaded, which is good. However, the second clause is cryptic and does not earn its place, and the overall terseness borders on under-specification rather than deliberate conciseness.

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

Completeness2/5

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

With five optional parameters, zero schema descriptions, and sibling tools that perform related listing/filtering tasks, the description is too sparse. It does not explain what the returned output contains, how filters interact, or when this tool is preferable to list_problem_torrents or analyze_largest_torrents.

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

Parameters2/5

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

Schema description coverage is 0%, so the description must compensate for the five undocumented parameters, but it only says 'using local filters' without explaining limit, state, category, min_size_gib, or inactive_days. The parameter names are somewhat self-explanatory, but the description adds essentially no parameter-level meaning.

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

Purpose4/5

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

The description states the verb ('List') and resource ('torrents') clearly, and the phrase 'using local filters' signals that filtering is done client-side. However, the second clause about arbitrary API endpoints is confusing and does little to distinguish this tool from siblings like get_torrent_details or list_problem_torrents.

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

Usage Guidelines2/5

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

No explicit guidance is given for when to use this tool versus alternatives such as get_torrent_details, list_problem_torrents, or analyze_largest_torrents. The 'local filters' hint implies a listing use case, but there are no exclusions, prerequisites, or decision rules.

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

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. 5 tool updatesv0.1.0
    • First observedanalyze_largest_torrents
    • First observedget_health_summary
    • First observedget_torrent_details
    • First observedlist_problem_torrents
    • First observedlist_torrents

TDQS

A3.7/5.0
Disambiguation5/5

Each tool targets a distinct monitoring concern: aggregate health, general torrent listing, per-torrent details, problem triage, and size/inactivity analysis. The two list-like tools are clearly differentiated by filtering to problem torrents versus all torrents.

Naming Consistency5/5

All tool names follow a consistent snake_case verb_noun pattern (get_*, list_*, analyze_*). There are no mixed conventions or vague one-word identifiers.

Tool Count5/5

Five tools is a well-scoped set for a read-only qBittorrent monitoring server. Each tool provides a distinct capability without redundancy.

Completeness4/5

The surface covers the main read-only workflow: health summary, listing, details, problem identification, and size analysis. Minor gaps exist around lower-level details like trackers or peer lists, but agents can accomplish core monitoring without dead ends.

Maintenance

ActivityMaintained
ResponsivenessNo issues

Resources

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