### Install yandex_tracker_client

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Install the library using pip.

```bash
pip install yandex_tracker_client
```

--------------------------------

### Get All Issue Transitions

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Retrieve a list of all available transitions for an issue and print each one.

```python
transitions = issue.transitions.get_all()
for transition in transitions:
  print transition
```

--------------------------------

### Get List of Queues

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Retrieve a list of all queues and take the first three.

```python
queues = client.queues.get_all()[:3]
```

--------------------------------

### Get Issue Details

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Retrieve an issue by its key and print its deadline and update timestamp.

```python
issue = client.issues['MYQUEUE-42']
print issue.deadline, issue.updatedAt
```

--------------------------------

### Get Queue Information

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Retrieve information about a specific queue by its key.

```python
queue = client.queues['MYQUEUE']
```

--------------------------------

### Manage Issues: Get, Create, Update, Delete

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Perform CRUD operations on issues using the `client.issues` collection. Handles fetching by key, creation with various fields, partial updates, and deletion. Includes safe fetching with `NotFound` exception handling.

```python
from yandex_tracker_client.exceptions import NotFound

# Fetch a single issue by key
issue = client.issues['MYQUEUE-42']
print(issue.key, issue.summary, issue.status.display, issue.deadline)

# Safe fetch with 404 handling
try:
    issue = client.issues['MYQUEUE-99999']
except NotFound:
    print('Issue not found')

# Create an issue
new_issue = client.issues.create(
    queue='MYQUEUE',
    summary='Fix login timeout bug',
    type={'name': 'Bug'},
    priority='critical',
    description='Users are logged out after 5 minutes of inactivity.',
    assignee='john.doe',
    tags=['auth', 'urgent'],
)
print(new_issue.key)  # → 'MYQUEUE-43'

# Update fields on an existing issue
issue = client.issues['MYQUEUE-42']
issue.update(
    summary='Fix login timeout bug (updated)',
    priority='minor',
    followers={'add': ['jane.doe', 'bob.smith']},
)

# Delete an issue
client.issues['MYQUEUE-43'].delete()
```

--------------------------------

### Issues - Get, Create, Update, Delete

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Manage issues using the `client.issues` collection. Supports fetching by key, creating new issues with various fields, updating existing issues, and deleting issues.

```APIDOC
## Issues — Get, Create, Update, Delete

`client.issues` is the primary collection for issue management. Supports key-based lookup, creation with any Tracker field, partial updates via PATCH, and deletion. All fields on a returned `Resource` are accessible as Python attributes.

```python
from yandex_tracker_client.exceptions import NotFound

# Fetch a single issue by key
issue = client.issues['MYQUEUE-42']
print(issue.key, issue.summary, issue.status.display, issue.deadline)

# Safe fetch with 404 handling
try:
    issue = client.issues['MYQUEUE-99999']
except NotFound:
    print('Issue not found')

# Create an issue
new_issue = client.issues.create(
    queue='MYQUEUE',
    summary='Fix login timeout bug',
    type={'name': 'Bug'},
    priority='critical',
    description='Users are logged out after 5 minutes of inactivity.',
    assignee='john.doe',
    tags=['auth', 'urgent'],
)
print(new_issue.key)  # → 'MYQUEUE-43'

# Update fields on an existing issue
issue = client.issues['MYQUEUE-42']
issue.update(
    summary='Fix login timeout bug (updated)',
    priority='minor',
    followers={'add': ['jane.doe', 'bob.smith']},
)

# Delete an issue
client.issues['MYQUEUE-43'].delete()
```
```

--------------------------------

### Get Queue from Issue

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Access the queue object associated with a specific issue.

```python
queue = client.issues['MYQUEUE-42'].queue
```

--------------------------------

### Initialize Tracker Client with Token

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Initialize the client with your API token and organization ID.

```python
from yandex_tracker_client import TrackerClient

client = TrackerClient(token=<token>, org_id=<org_id>)
```

--------------------------------

### Initialize Tracker Client with IAM Token

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Initialize the client for Yandex Cloud organizations using an IAM token and cloud organization ID.

```python
from yandex_tracker_client import TrackerClient
client = TrackerClient(iam_token=<token>, cloud_org_id=<org_id>)
```

--------------------------------

### Initialize TrackerClient

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Instantiate TrackerClient with OAuth or IAM tokens. Supports custom connection options like retries and timeouts.

```python
from yandex_tracker_client import TrackerClient
from yandex_tracker_client.exceptions import TrackerClientError

# Standard Yandex organization (OAuth token)
client = TrackerClient(token='y0_AgAAAA...', org_id='1234567')

# Yandex Cloud organization (IAM token)
client_cloud = TrackerClient(
    iam_token='t1.9euelZq...', 
    cloud_org_id='bpfxxxxxxxxx'
)

# Custom connection options: retries with exponential backoff
client_robust = TrackerClient(
    token='y0_AgAAAA...', 
    org_id='1234567',
    timeout=30,
    retries=5,
    retries_initial_delay=1,
    retries_delay_multiplier=2,
    retries_delay_upper_limit=30,
)

# Inspect authenticated user
me = client.myself
print(me.login, me.display)
# → 'john.doe'  'John Doe'
```

--------------------------------

### Execute Transition with Comment and Resolution

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Execute a 'close' transition for an issue, including a comment and resolution.

```python
issue = client.issues['MYQUEUE-42']
transition = issue.transitions['close']
transition.execute(comment='Fixed', resolution='fixed')
```

--------------------------------

### Client Initialization

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Initialize the TrackerClient with OAuth or IAM tokens for authentication. Supports custom connection options like timeouts and retries.

```APIDOC
## Client Initialization

`TrackerClient` is the entry point. It establishes an authenticated HTTP session against `https://api.tracker.yandex.net`. Accepts OAuth tokens for personal/service accounts or IAM tokens for Yandex Cloud organizations. Supports configurable retries, timeouts, and custom base URLs.

```python
from yandex_tracker_client import TrackerClient
from yandex_tracker_client.exceptions import TrackerClientError

# Standard Yandex organization (OAuth token)
client = TrackerClient(token='y0_AgAAAA...', org_id='1234567')

# Yandex Cloud organization (IAM token)
client_cloud = TrackerClient(
    iam_token='t1.9euelZq...', 
    cloud_org_id='bpfxxxxxxxxx'
)

# Custom connection options: retries with exponential backoff
client_robust = TrackerClient(
    token='y0_AgAAAA...', 
    org_id='1234567',
    timeout=30,
    retries=5,
    retries_initial_delay=1,
    retries_delay_multiplier=2,
    retries_delay_upper_limit=30,
)

# Inspect authenticated user
me = client.myself
print(me.login, me.display)
# → 'john.doe'  'John Doe'
```
```

--------------------------------

### Run Tests Script

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Executes the test suite using a shell script. This is a command-line operation.

```bash
./run_tests.sh
```

--------------------------------

### Create Issue

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Create a new issue in a specified queue with summary, type, and description.

```python
client.issues.create(
    queue='MYQUEUE',
    summary='API Test Issue',
    type={'name': 'Bug'},
    description='test description'
)
```

--------------------------------

### Entity API (Projects, Portfolios, Goals)

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Interact with projects, portfolios, and goals as entities, supporting comments, checklist items, attachments, links, and event history.

```APIDOC
## Entity API (Projects, Portfolios, Goals)

The newer Entities API (`client.project`, `client.portfolio`, `client.goal`) supports projects-as-entities with comments, checklist items, attachments, links, and event history.

### Search for projects
```python
projects = client.project.find(
    filter={'status': 'inProgress'},
    order_by='updatedAt',
    order_asc=False,
    per_page=20,
)
for proj in projects:
    print(proj.shortId, proj.entityType)
```

### Get a specific project entity
```python
project = client.project[123]
```

### Add a comment to a project
```python
project.comments.create(text='Milestone 2 approved by stakeholders.')
```

### Add a checklist item
```python
project.checklist_items.create(
    text='Conduct security review',
    assignee='security.lead',
    deadline='2024-06-30',
)
```

### Add a link between entities
```python
project.links.create(relationship='relates', entity='portfolio/45')
```

### Bulk update multiple projects
```python
client.project.bulk_update(
    meta_entities=[{'id': 123}, {'id': 124}],
    values={'status': 'inProgress'},
)
```

### Retrieve event history
```python
history = project.get_event_history(per_page=50)
```
```

--------------------------------

### Manage Issue Transitions

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

List available workflow transitions for an issue and execute them. Transitions can optionally include comments and resolution details.

```python
issue = client.issues['MYQUEUE-42']

# List all available transitions
for t in issue.transitions.get_all():
    print(t.id, '->', t.to.display)
# → 'close' -> 'Closed'
# → 'need_info' -> 'Need Info'

# Simple transition
issue.transitions['close'].execute()

# Transition with comment and resolution
issue.transitions['close'].execute(
    comment='Root cause identified and fix deployed to production.',
    resolution='fixed',
)
```

--------------------------------

### Bulk Transition Issues

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Transitions multiple issues to a new status. Requires a list of issue keys, the target status, and optional field updates.

```python
bulkchange = client.bulkchange.transition(
    ['MYQUEUE-42', 'MYQUEUE-43'], 'need_info', priority='minor')
bulkchange.wait()
```

--------------------------------

### Access Boards and Sprints

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Retrieve information about agile boards, their columns, and associated sprints. Access individual boards and sprints using their IDs.

```python
board = client.boards[42]
print(board.name, board.query)
```

```python
for b in client.boards.get_all():
    print(b.id, b.name)
```

```python
for col in board.columns.get_all():
    print(col.name, [s.display for s in col.statuses])
```

```python
for sprint in board.sprints.get_all():
    print(sprint.name, sprint.status, sprint.startDate, sprint.endDate)
```

```python
sprint = client.sprints[101]
```

--------------------------------

### Interact with Entity API (Projects, Portfolios, Goals)

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Utilize the Entities API for managing projects, portfolios, and goals, including searching, adding comments, checklist items, links, and performing bulk updates. Retrieve event history for entities.

```python
projects = client.project.find(
    filter={'status': 'inProgress'},
    order_by='updatedAt',
    order_asc=False,
    per_page=20,
)
for proj in projects:
    print(proj.shortId, proj.entityType)
```

```python
project = client.project[123]
```

```python
project.comments.create(text='Milestone 2 approved by stakeholders.')
```

```python
project.checklist_items.create(
    text='Conduct security review',
    assignee='security.lead',
    deadline='2024-06-30',
)
```

```python
project.links.create(relationship='relates', entity='portfolio/45')
```

```python
client.project.bulk_update(
    meta_entities=[{'id': 123}, {'id': 124}],
    values={'status': 'inProgress'},
)
```

```python
history = project.get_event_history(per_page=50)
```

--------------------------------

### Execute Issue Transition

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Execute a 'close' transition for an issue.

```python
issue = client.issues['MYQUEUE-42']
issue.transitions['close'].execute()
```

--------------------------------

### Retrieve and Inspect Queues

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Access queue metadata, components, versions, issue types, and more via `client.queues`. You can also check permissions and access queue-specific fields.

```python
# Get a single queue
queue = client.queues['MYQUEUE']
print(queue.name, queue.lead.display, queue.defaultPriority.display)

# List all queues
for q in client.queues.get_all():
    print(q.key, q.name)

# Queue sub-resources
components = queue.components
versions = queue.versions
issue_types = queue.issuetypes
triggers = queue.triggers
macros = queue.macros

# Queue from an issue
queue = client.issues['MYQUEUE-42'].queue

# Check a permission
result = queue.check_permissions('write')

# Access local (queue-specific) fields
for field in queue.local_fields:
    print(field.key, field.name)
```

--------------------------------

### Search Issues with Filter Parameters

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Search for issues using a dictionary for filtering, specifying order, and pagination.

```python
issues = client.issues.find(
    filter={'queue': 'MYQUEUE', 'assignee': 'me()', 'created': {'from': '2019-03-02'}},
    order=['update','-status', '+priority'],
    per_page=15
)
print [issue.key for issue in issues]
```

--------------------------------

### Download Issue Attachments

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Download all attachments for a given issue to a specified directory.

```python
[attachment.download_to('some/path') for attachments in client.get_attachments('MYQUEUE-42')]
```

--------------------------------

### Manage Worklog Entries

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Log, list, update, and delete time-tracking records using `client.worklog` or `issue.worklog`. Durations should be specified using ISO 8601 format.

```python
# Log time on an issue
issue = client.issues['MYQUEUE-42']
entry = issue.worklog.create(
    start='2024-05-01T10:00:00+03:00',
    duration='PT2H30M',   # ISO 8601 duration: 2 hours 30 minutes
    comment='Investigated authentication timeout root cause.',
)
print(entry.id, entry.duration)
```

--------------------------------

### Perform Custom Actions on Entities

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Execute arbitrary POST/PATCH requests for sub-resources not exposed by named methods, such as archiving, restoring, or moving entities. Clone issues or create subtasks with specific inheritance options.

```python
version = client.versions[60031]
version.perform_action('_archive', 'post', ignore_empty_body=True)
```

```python
issue = client.issues['MYQUEUE-42']
issue.move_to('ARCHIVE')
```

```python
cloned = issue.clone_to(
    queues=['BACKLOG'],
    clone_all_fields=True,
    link_with_original=True,
)
```

```python
subtask = issue.create_subtask(
    summary='Write unit tests for session manager fix',
    assignee='qa.engineer',
    inherit=True,
)
```

--------------------------------

### Manage Issue Links

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Use `issue.links` to manage relationships between issues and `issue.remotelinks` for external resource links. Links can be created, listed, and deleted.

```python
issue = client.issues['MYQUEUE-42']

# List links
for link in issue.links:
    print(link.type.inward, '->', link.object.key)

# Create an internal link
issue.links.create(issue='TEST-99', relationship='relates')
issue.links.create(issue='MYQUEUE-40', relationship='depends on')

# Delete a link by ID
issue.links[67890].delete()

# Add a remote link (e.g., to an external CI job)
issue.remotelinks.create(
    origin='ru.yandex.lunapark',
    key='build-12345',
    relationship='tested by',
)
```

--------------------------------

### Queues Management

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Retrieve queue metadata and access related sub-resources like components, versions, and issue types.

```APIDOC
## Queues Management

Retrieves queue metadata and exposes sub-resources including components, versions, issue types, triggers, macros, workflows, and access controls.

### Usage

```python
# Get a single queue
queue = client.queues['MYQUEUE']
print(queue.name, queue.lead.display, queue.defaultPriority.display)

# List all queues
for q in client.queues.get_all():
    print(q.key, q.name)

# Queue sub-resources
components = queue.components
versions = queue.versions
issue_types = queue.issuetypes
triggers = queue.triggers
macros = queue.macros

# Queue from an issue
queue = client.issues['MYQUEUE-42'].queue

# Check a permission
result = queue.check_permissions('write')

# Access local (queue-specific) fields
for field in queue.local_fields:
    print(field.key, field.name)
```
```

--------------------------------

### Search Issues by Query String

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Find issues using a Yandex Tracker query string. The query can be copied from the tracker interface.

```python
issues = client.issues.find('Queue: MYQUEUE Assignee: me()') #You can copy this query from ui tracker interface
print [issue.key for issue in issues]
```

--------------------------------

### Perform Custom Actions

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Execute arbitrary sub-resource POST/PATCH calls for actions not directly exposed by named methods.

```APIDOC
## Perform Custom Actions

`perform_action()` allows arbitrary sub-resource POST/PATCH calls not directly exposed by named methods — useful for endpoints like `/_archive`, `/_restore`, or `/_move`.

### Archive a version
```python
version = client.versions[60031]
version.perform_action('_archive', 'post', ignore_empty_body=True)
```

### Move an issue to a different queue via action
```python
issue = client.issues['MYQUEUE-42']
issue.move_to('ARCHIVE')
```

### Clone an issue to another queue
```python
cloned = issue.clone_to(
    queues=['BACKLOG'],
    clone_all_fields=True,
    link_with_original=True,
)
```

### Create a subtask inheriting parent's tags, components, and fixVersions
```python
subtask = issue.create_subtask(
    summary='Write unit tests for session manager fix',
    assignee='qa.engineer',
    inherit=True,
)
```
```

--------------------------------

### Boards and Sprints

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Access and manage agile boards, their columns, and associated sprints.

```APIDOC
## Boards and Sprints

`client.boards` and `client.sprints` give access to agile boards, their columns, and associated sprints.

### Get a board
```python
board = client.boards[42]
print(board.name, board.query)
```

### List all boards
```python
for b in client.boards.get_all():
    print(b.id, b.name)
```

### List columns on a board
```python
for col in board.columns.get_all():
    print(col.name, [s.display for s in col.statuses])
```

### List sprints on a board
```python
for sprint in board.sprints.get_all():
    print(sprint.name, sprint.status, sprint.startDate, sprint.endDate)
```

### Get a sprint directly
```python
sprint = client.sprints[101]
```
```

--------------------------------

### Issue Transitions

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Manage workflow transitions for an issue. List available transitions, execute simple transitions, or execute transitions with comments and resolutions.

```APIDOC
## Issue Transitions

`issue.transitions` lists available workflow transitions for an issue and `transition.execute()` fires the transition, optionally attaching a comment and resolution.

```python
issue = client.issues['MYQUEUE-42']

# List all available transitions
for t in issue.transitions.get_all():
    print(t.id, '->', t.to.display)
# → 'close' -> 'Closed'
# → 'need_info' -> 'Need Info'

# Simple transition
issue.transitions['close'].execute()

# Transition with comment and resolution
issue.transitions['close'].execute(
    comment='Root cause identified and fix deployed to production.',
    resolution='fixed',
)
```
```

--------------------------------

### Handle NotFound Exception

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Safely handle cases where an issue is not found by catching the NotFound exception.

```python
from yandex_tracker_client.exceptions import NotFound

try:
    issue = client.issues['MYQUEUE-42']
except NotFound:
    pass
```

--------------------------------

### Search and Filter Issues

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Find issues using free-text queries or structured filters. Supports ordering, pagination, and counting results without fetching all issues. The `find` method returns an iterable that handles pagination transparently.

```python
# Free-text Tracker query (copy-paste from UI)
issues = client.issues.find('Queue: MYQUEUE Assignee: me() Status: open')
for issue in issues:
    print(issue.key, issue.summary)

# Structured filter with ordering and pagination
issues = client.issues.find(
    filter={
        'queue': 'MYQUEUE',
        'assignee': 'john.doe',
        'created': {'from': '2024-01-01'},
        'status': ['open', 'inProgress'],
    },
    order=['-updatedAt', '+priority'],
    per_page=50,
)
keys = [i.key for i in issues]

# Count matching issues without fetching them
count = client.issues.find(
    filter={'queue': 'MYQUEUE', 'type': 'bug'},
    count_only=True,
)
print(count)  # → 17
```

--------------------------------

### Bulk Operations

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Perform bulk updates, transitions, or queue moves on multiple issues simultaneously.

```APIDOC
## Bulk Operations

Applies field updates, transitions, or queue moves to a list of issues in a single API call. `wait()` polls until the operation completes and returns the final status.

### Usage

```python
# Bulk field update — reassign and re-tag multiple issues
bulkchange = client.bulkchange.update(
    ['MYQUEUE-42', 'MYQUEUE-43', 'MYQUEUE-44'],
    assignee='jane.doe',
    priority='minor',
    tags={'add': ['triaged'], 'remove': ['needs-triage']},
)
result = bulkchange.wait()
print(result.status)  # → 'COMPLETE'

# Bulk transition
bulkchange = client.bulkchange.transition(
    ['MYQUEUE-45', 'MYQUEUE-46'],
    transition='need_info',
    comment='Waiting for additional info from reporter.',
)
bulkchange.wait()

# Bulk move to another queue
bulkchange = client.bulkchange.move(
    ['MYQUEUE-47', 'MYQUEUE-48'],
    queue='ARCHIVE',
    move_all_fields=True,
)
bulkchange.wait()

# Practical example: send employee on vacation
def reassign_issues(from_login, to_login):
    issues = client.issues.find(filter={'queue': 'MYQUEUE', 'assignee': from_login})
    bc = client.bulkchange.update(issues, assignee=to_login)
    bc = bc.wait()
    if bc.status == 'COMPLETE':
        for issue in issues:
            issue.comments.create(f'Reassigned to {to_login} during vacation.')
    return bc.status
```
```

--------------------------------

### List Issue Comments

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Retrieve and display the first three comments for a specific issue.

```python
issue = client.issues['MYQUEUE-42']
comments = list(issue.comments.get_all())[:3]
```

--------------------------------

### Bulk Move Issues

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Moves multiple issues to a different queue. Requires a list of issue keys and the target queue name.

```python
bulkchange = client.bulkchange.move(['MYQUEUE-42', 'MYQUEUE-43'], 'TEST')
bulkchange.wait()
```

--------------------------------

### Perform Custom Action on an Object

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Executes a custom action on an object, such as archiving a version. Use `ignore_empty_body=True` if the endpoint does not accept an empty body.

```python
version = client.versions[60031]
version.perform_action('_archive', 'post', ignore_empty_body=True)
```

--------------------------------

### List Issue Links

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Access the links associated with a specific issue.

```python
issue = client.issues['MYQUEUE-42']
links = issue.links
```

--------------------------------

### Add a Remote Link to an Issue

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Creates a remote link for an issue, useful for connecting to external systems. Requires origin, key, and relationship.

```python
issue = client.issues['MYQUEUE-42']
link = issue.remotelinks.create(origin="ru.yandex.lunapark", key="MYQUEUE-42", relationship="relates")
```

--------------------------------

### Upload Attachment to Issue

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Create and upload a new attachment to a specific issue.

```python
issue = client.issues['MYQUEUE-42']
issue.attachments.create('path/to/file')
```

--------------------------------

### Manage Issue Comments

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Use `issue.comments` to list, create, update, and delete comments on an issue. Comments can include text and optional file attachments.

```python
issue = client.issues['MYQUEUE-42']

# List first 10 comments
for comment in list(issue.comments.get_all())[:10]:
    print(comment.createdBy.display, ':', comment.text)

# Add a plain comment
comment = issue.comments.create(text='Investigation underway — reproducing locally.')

# Add a comment with file attachments
comment = issue.comments.create(
    text='Attached stack trace and heap dump.',
    attachments=['logs/stacktrace.txt', 'dumps/heap.hprof'],
)

# Edit an existing comment
comment = issue.comments[12345]
comment.update(text='Updated findings: the issue is in the session manager.')

# Delete a comment
issue.comments[12345].delete()
```

--------------------------------

### Add Comment with Attachments

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Create a new comment for an issue, including specified file attachments.

```python
issue = client.issues['MYQUEUE-42']
comment = issue.comments.create(text='Test comment', attachments=['path/to/file1', 'path/to/file2'])
```

--------------------------------

### Attachments Management

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Manage binary files attached to an issue, including uploading, downloading, and deleting.

```APIDOC
## Attachments Management

Manages binary files on an issue. Files can be uploaded by path or file object, downloaded to a directory, or deleted by ID or name.

### Usage

```python
issue = client.issues['MYQUEUE-42']

# List attachments
for attach in issue.attachments:
    print(attach.name, attach.size, attach.mimetype)

# Upload a file
issue.attachments.create('reports/screenshot.png')

# Upload from an open file object
with open('data/export.csv', 'rb') as f:
    issue.attachments.create(f)

# Download all attachments to a local directory
import os
os.makedirs('downloads', exist_ok=True)
for attach in issue.attachments:
    attach.download_to('downloads')

# Delete specific attachments by name
to_delete = {'old_report.pdf', 'draft.docx'}
for attach in issue.attachments:
    if attach.name in to_delete:
        attach.delete()
```
```

--------------------------------

### Bulk Update Issues

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Performs a bulk update on multiple issues, setting specified fields. The operation is asynchronous; use `.wait()` to ensure completion.

```python
bulkchange = client.bulkchange.update(
    ['MYQUEUE-42', 'MYQUEUE-43', 'MYQUEUE-44'],
    priority='minor',
    tags={'add': ['minored']})
print bulkchange.status
bulkchange = bulkchange.wait()
print bulkchange.status
```

--------------------------------

### Worklog Management

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Manage time-tracking records on issues, including creating, updating, and deleting entries.

```APIDOC
## Worklog Management

Manages time-tracking records. Entries can be listed, created per issue, updated, and deleted.

### Usage

```python
# Log time on an issue
issue = client.issues['MYQUEUE-42']
entry = issue.worklog.create(
    start='2024-05-01T10:00:00+03:00',
    duration='PT2H30M',   # ISO 8601 duration: 2 hours 30 minutes
    comment='Investigated authentication timeout root cause.',
)
print(entry.id, entry.duration)
```
```

--------------------------------

### Perform Bulk Operations on Issues

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

The `client.bulkchange` object enables applying field updates, transitions, or queue moves to multiple issues simultaneously. Use `wait()` to poll for operation completion.

```python
# Bulk field update — reassign and re-tag multiple issues
bulkchange = client.bulkchange.update(
    ['MYQUEUE-42', 'MYQUEUE-43', 'MYQUEUE-44'],
    assignee='jane.doe',
    priority='minor',
    tags={'add': ['triaged'], 'remove': ['needs-triage']},
)
result = bulkchange.wait()
print(result.status)  # → 'COMPLETE'

# Bulk transition
bulkchange = client.bulkchange.transition(
    ['MYQUEUE-45', 'MYQUEUE-46'],
    transition='need_info',
    comment='Waiting for additional info from reporter.',
)
bulkchange.wait()

# Bulk move to another queue
bulkchange = client.bulkchange.move(
    ['MYQUEUE-47', 'MYQUEUE-48'],
    queue='ARCHIVE',
    move_all_fields=True,
)
bulkchange.wait()

# Practical example: send employee on vacation
def reassign_issues(from_login, to_login):
    issues = client.issues.find(filter={'queue': 'MYQUEUE', 'assignee': from_login})
    bc = client.bulkchange.update(issues, assignee=to_login)
    bc = bc.wait()
    if bc.status == 'COMPLETE':
        for issue in issues:
            issue.comments.create(f'Reassigned to {to_login} during vacation.')
    return bc.status
```

--------------------------------

### Issue Links Management

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Create, list, and delete typed relationships between issues and links to external resources.

```APIDOC
## Issue Links Management

Creates, lists, and deletes typed relationships between issues. `issue.remotelinks` creates links to external resources (e.g., CI systems).

### Usage

```python
issue = client.issues['MYQUEUE-42']

# List links
for link in issue.links:
    print(link.type.inward, '->', link.object.key)

# Create an internal link
issue.links.create(issue='TEST-99', relationship='relates')
issue.links.create(issue='MYQUEUE-40', relationship='depends on')

# Delete a link by ID
issue.links[67890].delete()

# Add a remote link (e.g., to an external CI job)
issue.remotelinks.create(
    origin='ru.yandex.lunapark',
    key='build-12345',
    relationship='tested by',
)
```
```

--------------------------------

### Manage Issue Attachments

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

The `issue.attachments` resource allows uploading files by path or file object, downloading them, and deleting them by ID or name. Ensure the target directory exists before downloading.

```python
issue = client.issues['MYQUEUE-42']

# List attachments
for attach in issue.attachments:
    print(attach.name, attach.size, attach.mimetype)

# Upload a file
issue.attachments.create('reports/screenshot.png')

# Upload from an open file object
with open('data/export.csv', 'rb') as f:
    issue.attachments.create(f)

# Download all attachments to a local directory
import os
os.makedirs('downloads', exist_ok=True)
for attach in issue.attachments:
    attach.download_to('downloads')

# Delete specific attachments by name
to_delete = {'old_report.pdf', 'draft.docx'}
for attach in issue.attachments:
    if attach.name in to_delete:
        attach.delete()
```

--------------------------------

### Issues - Search and Filter

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Search and filter issues using `issues.find()`. Supports free-text queries, structured filters, ordering, and pagination. Can also return only the count of matching issues.

```APIDOC
## Issues — Search and Filter

`issues.find()` POSTs to `/_search` and supports free-text Tracker query language, structured filter dicts, multi-field ordering, and pagination. Returns an iterable that transparently fetches subsequent pages.

```python
# Free-text Tracker query (copy-paste from UI)
issues = client.issues.find('Queue: MYQUEUE Assignee: me() Status: open')
for issue in issues:
    print(issue.key, issue.summary)

# Structured filter with ordering and pagination
issues = client.issues.find(
    filter={
        'queue': 'MYQUEUE',
        'assignee': 'john.doe',
        'created': {'from': '2024-01-01'},
        'status': ['open', 'inProgress'],
    },
    order=['-updatedAt', '+priority'],
    per_page=50,
)
keys = [i.key for i in issues]

# Count matching issues without fetching them
count = client.issues.find(
    filter={'queue': 'MYQUEUE', 'type': 'bug'},
    count_only=True,
)
print(count)  # → 17
```
```

--------------------------------

### Exception Handling

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Handle various Yandex Tracker client errors using specific exception types.

```APIDOC
## Exception Handling

All client errors inherit from `TrackerError`. HTTP error codes are mapped to typed exceptions allowing fine-grained `except` clauses.

```python
from yandex_tracker_client.exceptions import (
    NotFound, Forbidden, BadRequest, Conflict,
    OutOfRetries, TrackerRequestError
)

try:
    issue = client.issues['INVALID-0']
except NotFound:
    print('Issue does not exist')
except Forbidden:
    print('No read permission for this queue')
except BadRequest as e:
    print('Bad request:', e.error_messages)
except Conflict as e:
    print('Version conflict:', e.status_code)
except OutOfRetries as e:
    print('Server unavailable after all retries:', e)
except TrackerRequestError as e:
    # Network-level failure (DNS, timeout, etc.)
    print('Connection error:', e)
```
```

--------------------------------

### Manage Worklog Entries

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Perform operations on worklog entries for an issue, including listing, updating, and deleting. Find worklogs across the organization by specifying a date range.

```python
for entry in issue.worklog.get_all():
    print(entry.createdBy.display, entry.duration, entry.comment)
```

```python
entry.update(duration='PT3H', comment='Revised estimate after re-check.')
```

```python
entry.delete()
```

```python
logs = client.worklog.find(createdAt={'from': '2024-05-01', 'to': '2024-05-31'})
```

--------------------------------

### List Issue Attachments

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Access the attachments associated with a specific issue.

```python
attachments = client.issues['MYQUEUE-42'].attachments
```

--------------------------------

### Add Comment to Issue

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Create a new comment with text for a specific issue.

```python
issue = client.issues['MYQUEUE-42']
comment = issue.comments.create(text='Test Comment')
```

--------------------------------

### Add Link to Issue

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Create a new link between the current issue and another issue, specifying the relationship.

```python
issue = client.issues['MYQUEUE-42']
link = issue.links.create(issue='TEST-42', relationship='relates')
```

--------------------------------

### Create Related Issues for a New Feature

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Initiates a new feature creation process by creating a main task, and optionally related design tasks, followers, and testers based on feature type. Links issues and updates fields as needed.

```python
def start_new_feature_creation_process(feature):
    feature_type = get_feature_type(feature)
    manager = get_manager_by_type(feature_type)
    # manager = 'manager_login'
    main_issue = client.issues.create(
        queue='MAINQUEUE',
        assignee=manager,
        summary='New feature request: {}'.format(feature),
        type={'name': 'Task'},
        description='New feature request arrived'
    )
    if feature_type.need_design:
        design_issue = client.issues.create(
            queue='DESIGN',
            summary='Feature "{}" design'.format(feature),
            type={'name': 'Task'},
            description='Need design for new feature, main task: {}'.format(main_issue.id)
        )
        main_issue.links.create(issue=design_issue.id, relationship='relates')

    if feature_type.add_followers:
        followers = get_followers(feature_type)
        # followers = ['my_login', 'someoneelse_login']
        main_issue.update(followers={'add': followers})

    if feature_type.need_testing:
        tester = get_random_tester()
        # tester = 'tester_login'
        main_issue.update(qa=tester)

    log.info('Successfully start new feature creation process')
    return main_issue.id
```

--------------------------------

### Update Issue

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Update an existing issue's summary and priority.

```python
issue = client.issues['MYQUEUE-42']
issue.update(summary='East or west, Yandex Tracker is the best', priority='minor')
```

--------------------------------

### Worklog Management

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Operations for managing worklog entries associated with issues, including listing, updating, deleting, and finding worklogs.

```APIDOC
## Worklog Management

### List worklog entries for an issue
```python
for entry in issue.worklog.get_all():
    print(entry.createdBy.display, entry.duration, entry.comment)
```

### Update a worklog entry
```python
entry.update(duration='PT3H', comment='Revised estimate after re-check.')
```

### Delete a worklog entry
```python
entry.delete()
```

### Find worklogs across the organization by date range
```python
logs = client.worklog.find(createdAt={'from': '2024-05-01', 'to': '2024-05-31'})
```
```

--------------------------------

### Change Assignee in Multiple Tickets

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Finds issues assigned to a specific user and reassigns them to another user in a bulk operation. Includes creating a comment on each ticket.

```python
from yandex_tracker_client import TrackerClient

client = TrackerClient(token=<token>, org_id=<org_id>)

def sent_employee_to_vacation(assignee, replace_with):
    """
    :param assignee: login in Yandex Tracker
    :type assignee: ``str``

    :param replace_with: login in Yandex Tracker
    :type replace_with: ``str``

    :return: is operation was successful
    :rtype: ``bool``
    """
    issues_to_transfer = client.issues.find(filter={'queue': 'MYQUEUE', 'assignee': assignee})
    bulk_change = client.bulkchange.update(issues_to_transfer, assignee=replace_with)
    bulk_change.wait()

    if bulk_change.status == 'COMPLETED':
        log.info('Successfully change assignee in bulkchange {}'.format(bulk_change.id))
        for issue in issues_to_transfer:
            issue.comments.create('Your ticket will be processed by another employee - {}'.format(replace_with))
        successful = True
    else:
        log.error('Bulkchange operation {} failed'.format(bulk_change.id))
        successful = False

    return successful
```

--------------------------------

### Handle Yandex Tracker Exceptions

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Catch specific exceptions that inherit from TrackerError for fine-grained error handling. Handle network-level failures with TrackerRequestError.

```python
from yandex_tracker_client.exceptions import (
    NotFound, Forbidden, BadRequest, Conflict,
    OutOfRetries, TrackerRequestError
)

try:
    issue = client.issues['INVALID-0']
except NotFound:
    print('Issue does not exist')
except Forbidden:
    print('No read permission for this queue')
except BadRequest as e:
    print('Bad request:', e.error_messages)
except Conflict as e:
    print('Version conflict:', e.status_code)
except OutOfRetries as e:
    print('Server unavailable after all retries:', e)
except TrackerRequestError as e:
    # Network-level failure (DNS, timeout, etc.)
    print('Connection error:', e)
```

--------------------------------

### Comments Management

Source: https://context7.com/yandex/yandex_tracker_client/llms.txt

Manage comments on an issue, including listing, creating, updating, and deleting.

```APIDOC
## Comments Management

Manages the comment thread on an issue. Supports listing, creating with optional file attachments, updating, and deleting individual comments.

### Usage

```python
issue = client.issues['MYQUEUE-42']

# List first 10 comments
for comment in list(issue.comments.get_all())[:10]:
    print(comment.createdBy.display, ':', comment.text)

# Add a plain comment
comment = issue.comments.create(text='Investigation underway — reproducing locally.')

# Add a comment with file attachments
comment = issue.comments.create(
    text='Attached stack trace and heap dump.',
    attachments=['logs/stacktrace.txt', 'dumps/heap.hprof'],
)

# Edit an existing comment
comment = issue.comments[12345]
comment.update(text='Updated findings: the issue is in the session manager.')

# Delete a comment
issue.comments[12345].delete()
```
```

--------------------------------

### Delete an Issue Link

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Deletes a specific link associated with an issue. Ensure you have the correct issue key and link ID.

```python
issue = client.issues['MYQUEUE-42']
link = issue.links[42]
link.delete()
```

--------------------------------

### Delete Attachment by Name

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Delete attachments from an issue by their names.

```python
ATTACHMENTS_TO_DELETE = {'to_delete.txt', 'smth.jpeg'}
issue = client.issues['MYQUEUE-42']
for attach in issue.attachments:
    if attach.name in ATTACHMENTS_TO_DELETE:
        attach.delete()
```

--------------------------------

### Update Issue Comment

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Update the text of an existing comment using its ID.

```python
issue = client.issues['MYQUEUE-42']
comment = issue.comments[42]
comment.update(text='New Text')
```

--------------------------------

### Delete Attachment by ID

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Delete a specific attachment from an issue using its ID.

```python
issue.attachments[42].delete()
```

--------------------------------

### Delete Issue Comment

Source: https://github.com/yandex/yandex_tracker_client/blob/master/README.rst

Delete a specific comment from an issue using its ID.

```python
issue = client.issues['MYQUEUE-42']
comment = issue.comments[42]
comment.delete()
```

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