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jira_update_issue

Update a Jira issue by modifying fields, changing status, adding Epic links, or attaching files. Specify the issue key and fields to update.

Instructions

Update an existing Jira issue including changing status, adding Epic links, updating fields, etc.

Args: ctx: The FastMCP context. issue_key: Jira issue key. fields: Dictionary of fields to update. additional_fields: Optional dictionary of additional fields. attachments: Optional JSON array string or comma-separated list of file paths.

Returns: JSON string representing the updated issue object and attachment results.

Raises: ValueError: If in read-only mode or Jira client unavailable, or invalid input.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
fieldsYesDictionary of fields to update. For 'assignee', provide a string identifier (email, name, or accountId). Example: `{'assignee': 'user@example.com', 'summary': 'New Summary'}`
issue_keyYesJira issue key (e.g., 'PROJ-123')
attachmentsNo(Optional) JSON string array or comma-separated list of file paths to attach to the issue. Example: '/path/to/file1.txt,/path/to/file2.txt' or ['/path/to/file1.txt','/path/to/file2.txt']
additional_fieldsNo(Optional) Dictionary of additional fields to update. Use this for custom fields or more complex updates.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

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

No annotations are provided, so the description must fully disclose behavioral traits. It explains that the tool can change status, add epic links, update fields, and attach files. It also states return value format and error conditions (ValueError for read-only mode, unavailable client, invalid input). This is sufficient for a mutation tool.

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

Conciseness4/5

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

The description is well-structured with an intro, Args, Returns, and Raises sections. It is front-loaded with the main purpose. While the Args section repeats parameter names from the schema, it includes examples that add value. Every sentence serves a purpose.

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 tool has 4 parameters, 2 required, and an output schema is stated, the description covers inputs with examples, return type, and error conditions. It does not address potential conflicts or partial failures, but it is complete enough for an agent to use confidently.

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?

Schema description coverage is 100%, so the baseline is 3. The description adds useful examples for 'fields' and 'attachments' parameters, but does not deeply explain 'additional_fields' beyond a generic note. This provides marginal added value over the schema.

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 clearly states the tool updates an existing Jira issue and lists specific capabilities (changing status, adding Epic links, updating fields). This distinguishes it from sibling tools like jira_create_issue, jira_transition_issue, and jira_link_to_epic, which are more specialized.

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 description mentions capabilities that overlap with sibling tools (e.g., transition, epic linking) but does not provide explicit guidance on when to use this tool versus those. There is no 'when-not-to-use' or alternative recommendations, leaving the agent to infer usage context.

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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