HTML — 103 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze HTML code through the act MCP server. 103 operations available: 29 refactor, 18 query, 42 analysis, 14 verification. Each operation is callable from Claude Code, Cursor, Codex, OpenCode, or any MCP-compatible agent host. Click any operation for a stable anchor link suitable for citation.

Worked HTML examples

act101 edits HTML using the element tree the tree-sitter grammar exposes, so an edit targets a specific tag or attribute rather than a raw line offset. It can add the lang attribute to the root <html> element, which assistive technology and search engines both read. It can reorder an element's attributes into a conventional order, type and name ahead of the rest on a form control, or sort every element's attributes alphabetically, without altering a single name or value. Each example below is the verbatim output of the command shown, run against the file shown.

Declare the document language on the html element

page.html is a complete document skeleton whose root <html> element carries no lang attribute, so nothing states what language the content is in.

$ act refactor-lang add_lang_attribute --file page.html --params '{"language":"de"}'

Before

<html><head></head><body><p>Inhalt</p></body></html>

After

<html lang="de"><head></head><body><p>Inhalt</p></body></html>

lang="de" is added to the root <html> tag; the <head> and <body> are unchanged.

Reorder the attributes on a form control

field.html is a single <input> whose attributes are written in an arbitrary order, with value ahead of type and name.

$ act refactor-lang reorder_attributes --file field.html --params '{"element":"element","line":1,"column":1}'

Before

<input value="default" type="text" name="username" placeholder="Enter name" />

After

<input type="text" name="username" placeholder="Enter name" value="default" />

type and name move to the front and value to the back; every attribute name and value is preserved exactly.

Sort every element's attributes alphabetically

rsvp.html is a supper RSVP page whose <form>, <input> and <select> list their attributes in the order they were written: method before action, type first on the guest-count field.

$ act refactor-lang sort_attributes --file rsvp.html --params '{}'

Before

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Harvest supper RSVP</title>
  </head>
  <body>
    <main id="rsvp">
      <h1>Harvest supper</h1>
      <form method="post" action="/rsvp">
        <label for="guests">Guests</label>
        <input type="number" name="guests" id="guests" min="1" max="6" required>
        <label for="diet">Dietary needs</label>
        <select name="diet" id="diet">
          <option value="none">None</option>
          <option value="vegan">Vegan</option>
        </select>
        <button type="submit">Send RSVP</button>
      </form>
    </main>
  </body>
</html>

After

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Harvest supper RSVP</title>
  </head>
  <body>
    <main id="rsvp">
      <h1>Harvest supper</h1>
      <form action="/rsvp" method="post">
        <label for="guests">Guests</label>
        <input id="guests" max="6" min="1" name="guests" required type="number">
        <label for="diet">Dietary needs</label>
        <select id="diet" name="diet">
          <option value="none">None</option>
          <option value="vegan">Vegan</option>
        </select>
        <button type="submit">Send RSVP</button>
      </form>
    </main>
  </body>
</html>

Those three elements now list their attributes alphabetically, the boolean required included; elements with a single attribute, such as <option> and <label>, are unchanged, as is every value.

Query

18 query tools, the same on every supported language. Descriptions live in the shared reference: /docs/query-tools.

callers control_flow data_flow definition diagnostics effect_closure effect_summary fix_auto get_type graph import_organize interface mutations references repo_outline skeleton symbols symbols_batch

Refactor

Analysis

42 analysis tools, the same on every supported language. Descriptions live in the shared reference: /docs/analysis-tools.

analyze_api_diff analyze_chokepoints analyze_clones analyze_clusters analyze_cohesion analyze_conformance analyze_coupling analyze_cycle_risk analyze_cycles analyze_dead_code analyze_depth analyze_entry_points analyze_export analyze_extraction analyze_fan_balance analyze_features analyze_hotspots analyze_impact analyze_inconsistencies analyze_inheritance analyze_interface_bloat analyze_interfaces analyze_layers analyze_orphan_types analyze_patterns analyze_platform_deps analyze_readiness analyze_roles analyze_seams analyze_stability analyze_surface analyze_test_gaps analyze_thickness analyze_type_completeness churn_hotspots co_change_clusters coverage_overlay ownership_map profile_overlay simulate split_module trace_overlay

Verify

14 verify tools, the same on every supported language. Descriptions live in the shared reference: /docs/verification.

bisect_regression gate generate_test_harness scan secret_surface summarize_pr taint_flow unsafe_surface verify_behavioral_equivalence verify_contract_preserved verify_diff_semantics verify_port_parity verify_side_effects verify_test_impact