jira-mini-mcp

A Jira Cloud MCP server for coding agents: 6 read tools, 9 with writes enabled.

One job. One tool. Done right.

General-purpose Atlassian MCP servers expose dozens to hundreds of tools. Every one costs context before the agent does any useful work, and every near-duplicate makes the agent's choice less certain. This server gives a coding agent the Jira context it needs for a ticket, the three ways to answer back, and nothing else.

• 6-9 tools, not 98 - every one earns its place in context, and the descriptions are tested so an agent picks the right one; see why so few and how it's compared with the alternatives.
• A write surface of exactly three tools - comment, transition, update. Set READ_ONLY_MODE=true and they never register, not even as a disabled entry the agent can see.
• Compact, predictable output - stable JSON schemas, Markdown for rich text, no null spam, no self URLs, emails, or avatars; see what the tools return.
• Up to ~40% less output on the wire - turn off the duplicated structuredContent per tool with DISABLE_STRUCTURED_OUTPUT; the model still gets the same JSON. See Cheaper output.
• Nothing is silently cut short - exact totals on comments and changelog, cursor paging on search, and limit=0 to fetch the rest. A failed request is an error, never an empty list.
• Errors an agent can act on - a wrong transition name lists every valid transition and where it leads, so there is no separate discovery tool. Errors never contain your Jira URL, credentials, or raw response bodies.
• API token or OAuth - one minute with an API token, or a browser login through your own OAuth 2.0 app with automatic refresh; see Configure.
• On PyPI - uvx jira-mini-mcp or pip install jira-mini-mcp, no repo clone or git URL required.

• Install
• Configure
• Writing to Jira
• Why so few tools
• Compared with the alternatives
• Contributing and security

More detail lives in docs/: configuration, OAuth setup, and what the tools return, with examples.

Install

uvx jira-mini-mcp

or

pip install jira-mini-mcp

Pin a version when you want a fixed surface: uvx jira-mini-mcp==1.1.0.

Running an unreleased commit straight from GitHub also works:

uvx --from git+https://github.com/proprock/jira-mini-mcp jira-mini-mcp

Requires Python 3.12+ and uv (or pip).

Configure

With an API token, three values:

Add READ_ONLY_MODE=true to withhold the write tools. Every setting, including DISABLE_STRUCTURED_OUTPUT, is in configuration.md.

Configuration is validated at startup, and an error names the missing setting without printing its value or your Jira URL. Keep the token in the host's own configuration and never commit it. The server acts with your account's permissions: an account that cannot transition an issue still cannot, whatever this server exposes.

claude mcp add --env JIRA_BASE_URL=https://example.atlassian.net --env JIRA_EMAIL=you@example.com --env JIRA_API_TOKEN=your-token --transport stdio jira-mini -- uvx jira-mini-mcp

{
  "mcpServers": {
    "jira-mini": {
      "command": "uvx",
      "args": ["jira-mini-mcp"],
      "env": {
        "JIRA_BASE_URL": "https://example.atlassian.net",
        "JIRA_EMAIL": "you@example.com",
        "JIRA_API_TOKEN": "your-token"
      }
    }
  }
}

codex mcp add jira-mini --env JIRA_BASE_URL=https://example.atlassian.net --env JIRA_EMAIL=you@example.com --env JIRA_API_TOKEN=your-token -- uvx jira-mini-mcp

Writing to Jira

Three tools, chosen so an agent can close the loop on a ticket it worked:

add_comment(issue_key, body)
transition_issue(issue_key, to, comment=None)
update_issue(issue_key, fields)

Issue creation, links, attachment upload, worklogs, and deletion are out of scope. Creation needs per-project, per-type required-field discovery and is a feature in its own right; a link, or a request for one, fits in a comment.

Three things are worth knowing before an agent writes:

• transition_issue takes a name, not an id. A transition name or the name of the status to reach, matched ignoring case. They differ in real workflows - a transition called In Progress can produce a status called In Development, and two differently named transitions can reach one status - so prefer the transition name. When nothing matches, the error lists every available transition and where it leads. That listing is the discovery mechanism, which is why there is no separate get_transitions tool.
• update_issue replaces labels and components wholesale. There is no add or remove verb, so read the issue first if you mean to add one value. It takes the same values get_issue returns: assignee as an account id or the literal "me", description as Markdown, customfield_* as raw Jira JSON. It refuses status and comment, naming the tool that does each.
• Markdown is converted, not guessed at. Headings, lists, fenced code, inline marks, and links become Jira rich text; anything outside that set stays literal rather than being reinterpreted.

Each write tool is annotated readOnlyHint=false with honest destructiveHint and idempotentHint values, which is what READ_ONLY_MODE filters on.

Why so few tools

A tool definition is a name, a description, an input schema, and often an output contract. Depending on the client, all of it enters the model's context before any work happens. A large toolset therefore spends context on capabilities the current task will never use, and raises the chance of picking the wrong tool, confusing similar ones, or passing bad parameters.

Six to nine compact schemas stay affordable for a whole session, leaving the context budget for source code, issue descriptions, stack traces, and reasoning. The design follows Anthropic's guidance for agent systems: keep toolsets small, role-scoped, and clearly differentiated.

This is a claim, so the repository tests it. The offline half runs with the suite and checks that every tool is described substantially, that no two descriptions are near-duplicates, and that every parameter whose behavior cannot be guessed from its name is explained in prose. The other half puts the real tool definitions in front of a real model and scores which one it picks - see evals/README.md.

The same principle shapes the responses. get_issue does not dump hundreds of comments, the full changelog, attachment contents, or every custom field; large resources are fetched only when asked for.

Compared with the alternatives

The official server is the better choice when you need breadth across Atlassian products, OAuth without registering an app of your own, Jira Service Management, or organization-level controls such as permission groups, IP allowlisting, and audit logs. It is Atlassian's own product, it tracks their APIs, and nothing here competes with that.

mcp-atlassian is the better choice when you need Confluence alongside Jira, Server/Data Center, or simply broader Jira coverage than six to nine tools.

This server is the better choice for one narrow case: a coding agent working a Jira ticket, where the context every tool definition costs is worth more than the coverage it buys.

Contributing and security

Setup, checks, the test and eval commands, the branch and commit conventions, and the release model are in CONTRIBUTING.md. Report vulnerabilities privately as described in SECURITY.md. Changes that affect someone running the server are recorded in CHANGELOG.md.

License

MIT. Not an official Atlassian product.