Nvda Addon Specialist

What it does

When your agent uses it

• Tasks that involve Accessibility

Example prompts

• “/nvda-addon-specialist”

Requirements

• Python 3

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

1. 1Source code is the authority. Every architectural claim is verified against github.com/nvaccess/nvda.
2. 2Never block the main thread. NVDA runs a single-threaded main loop. Blocking calls freeze all speech, braille, and input handling.
3. 3Always call nextHandler(). Event handlers that skip this break all downstream processing.
4. 4Use the @script decorator. Modern NVDA addons use the decorator, not legacy __gestures dicts.
5. 5Test with the real screen reader. Verify addons with NVDA itself.
6. 6Package for the Add-on Store. Follow the official submission process.

What it can do on your machine

Read from SKILL.md and the folder at commit decf6ba. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are python).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • github.com
  • nvaccess.org
  • groups.io

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Nvda Addon Specialist loads about 1.5k tokens when it runs, and up to ~3.8k if it reads all its reference files. Until then it costs about 23 tokens; SKILL.md has 408 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~23

When it runs · the whole SKILL.md, loaded when a task matches

~1.5k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~3.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Community-Access/accessibility-agents at commit decf6ba, republished under its MIT licence (© Community-Access). 408 words, ~1,523 tokens.

name

nvda-addon-specialist

description

NVDA add-ons: plugin types, manifest, events, scripts and packaging.

license

MIT

disable-model-invocation

true

metadata.tier

specialist

metadata.domain

desktop

metadata.output

guidance

metadata.effort

medium

metadata.title

NVDA Add-on Specialist

API Handler (IAccessible/UIA/JAB)
  -> eventHandler.executeEvent()
    -> Global Plugin 1 .event_*()
    -> Global Plugin 2 .event_*()
    -> App Module .event_*()
    -> Tree Interceptor .event_*()
    -> NVDAObject .event_*()

1. gesture.scriptableObject
2. Global Plugins (all, in order)
3. App Module (focused app)
4. Braille Display Driver
5. Vision Enhancement Providers
6. Tree Interceptor
7. Focused NVDAObject
8. Focus Ancestors (if canPropagate=True)
9. globalCommands

from scriptHandler import script

@script(
    description=_("Announces the current time"),
    category="My Addon",
    gesture="kb:NVDA+shift+t",
    speakOnDemand=True,
)
def script_announceTime(self, gesture):
    import ui, time
    ui.message(time.strftime("%H:%M:%S"))

© Community-Access, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 4 other files (references) in skills/nvda-addon-specialist of Community-Access/accessibility-agents.

• SKILL.md
• agents/openai.yaml
• references/addon-file-structure.md
• references/addon-types.md
• references/nvda-2026-1-architecture-transition.md

Open the folder on GitHubat commit decf6ba