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Security and execution safeguards
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Default policy allows all commands
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<h1 id="bash-tool-for-adk">Bash Tool for ADK<a class="headerlink" href="#bash-tool-for-adk" title="Permanent link">&para;</a></h1>
<div class="language-support-tag">
<span class="lst-supported">Supported in ADK</span><span class="lst-python">Python v1.27.0</span>
</div>
<p>The <code>ExecuteBashTool</code> allows an ADK agent to execute bash commands within a local workspace directory. This tool is useful for file system operations, running scripts, or interacting with the local environment directly through the agent.
The tool is only available for Python ADK.</p>
<h2 id="installation">Installation<a class="headerlink" href="#installation" title="Permanent link">&para;</a></h2>
<p>The Bash Tool is included by default in the core Agent Development Kit (ADK). You don't need to install any separate integration packages; simply install the main library:</p>
<div class="language-bash highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>pip<span class="w"> </span>install<span class="w"> </span>google-adk
</span></code></pre></div>
<h2 id="use-with-agent">Use with agent<a class="headerlink" href="#use-with-agent" title="Permanent link">&para;</a></h2>
<div class="admonition warning">
<p class="admonition-title">POSIX-only</p>
<p><code>ExecuteBashTool</code> is currently supported <strong>only on POSIX systems</strong> such as Linux or macOS. Executing this tool on a Windows system will result in a hard error.</p>
</div>
<p>To use the Bash Tool, instantiate <code>ExecuteBashTool</code> and include it in your agent's <code>tools</code> list. Ensure <code>my_workspace_path</code> is defined prior to running the snippet as a valid directory path string:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">google.adk.tools.bash_tool</span><span class="w"> </span><span class="kn">import</span> <span class="n">ExecuteBashTool</span><span class="p">,</span> <span class="n">BashToolPolicy</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="n">policy</span> <span class="o">=</span> <span class="n">BashToolPolicy</span><span class="p">(</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a> <span class="n">allowed_command_prefixes</span><span class="o">=</span><span class="p">(</span><span class="s2">"ls"</span><span class="p">,</span> <span class="s2">"cat"</span><span class="p">,</span> <span class="s2">"grep"</span><span class="p">),</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a> <span class="n">timeout_seconds</span><span class="o">=</span><span class="mi">30</span><span class="p">,</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a> <span class="n">max_memory_bytes</span><span class="o">=</span><span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">512</span><span class="p">,</span> <span class="c1"># 512MB</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a> <span class="n">max_file_size_bytes</span><span class="o">=</span><span class="mi">1024</span> <span class="o">*</span> <span class="mi">1024</span> <span class="o">*</span> <span class="mi">10</span><span class="p">,</span> <span class="c1"># 10MB</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a> <span class="n">max_child_processes</span><span class="o">=</span><span class="mi">5</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="p">)</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="n">tool</span> <span class="o">=</span> <span class="n">ExecuteBashTool</span><span class="p">(</span><span class="n">workspace</span><span class="o">=</span><span class="n">my_workspace_path</span><span class="p">,</span> <span class="n">policy</span><span class="o">=</span><span class="n">policy</span><span class="p">)</span>
</span></code></pre></div>
<h2 id="security-and-execution-safeguards">Security and execution safeguards<a class="headerlink" href="#security-and-execution-safeguards" title="Permanent link">&para;</a></h2>
<p>Because executing arbitrary code carries inherent risks, the <code>ExecuteBashTool</code> includes several mandatory and optional security features enforced upon the spawned subprocess.</p>
<h3 id="default-policy-allows-all-commands">Default policy allows all commands<a class="headerlink" href="#default-policy-allows-all-commands" title="Permanent link">&para;</a></h3>
<p>By default, <code>BashToolPolicy</code> is initialized with <code>allowed_command_prefixes=("*",)</code>. This means that <strong>all commands are permitted by default</strong>. To secure your application, you must explicitly restrict the allowed commands when initializing the policy:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="c1"># Secure implementation example</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">google.adk.tools.bash_tool</span><span class="w"> </span><span class="kn">import</span> <span class="n">BashToolPolicy</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="n">strict_policy</span> <span class="o">=</span> <span class="n">BashToolPolicy</span><span class="p">(</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a> <span class="n">allowed_command_prefixes</span><span class="o">=</span><span class="p">(</span><span class="s2">"ls "</span><span class="p">,</span> <span class="s2">"cat "</span><span class="p">,</span> <span class="s2">"pwd"</span><span class="p">)</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="p">)</span>
</span></code></pre></div>
<h3 id="built-in-protections">Built-in protections<a class="headerlink" href="#built-in-protections" title="Permanent link">&para;</a></h3>
<ol>
<li><strong>User Confirmation:</strong> The tool <strong>always</strong> requests user confirmation before executing a command. The framework pauses execution and waits for the user or client application to approve the command via the <code>adk_request_confirmation</code> flow.</li>
<li><strong>Command Validation:</strong> You can whitelist specific commands using <code>allowed_command_prefixes</code> and strictly forbid certain string patterns using <code>blocked_operators</code>.</li>
<li><strong>Resource Limits:</strong> OS-level limits,<code>setrlimit</code>, are applied to restrict memory consumption, file sizes, and the number of child processes to prevent fork bombs or memory exhaustion. </li>
<li><strong>Core Dumps Disabled:</strong> To prevent sensitive memory leaks, core dumps are strictly disabled, <code>RLIMIT_CORE</code> set to <code>0</code>, for the executing subprocess.</li>
<li><strong>Process Group Termination:</strong> If a command exceeds the <code>timeout_seconds</code>, the tool issues a <code>SIGKILL</code> to the entire process group to ensure no orphan background processes are left running.</li>
</ol>
<h2 id="available-tools">Available tools<a class="headerlink" href="#available-tools" title="Permanent link">&para;</a></h2>
<table>
<thead>
<tr>
<th style="text-align: left;">Tool Name</th>
<th style="text-align: left;">Class Name</th>
<th style="text-align: left;">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left;"><code>execute_bash</code></td>
<td style="text-align: left;"><code>ExecuteBashTool</code></td>
<td style="text-align: left;">Executes a bash command within a workspace. POSIX only</td>
</tr>
</tbody>
</table>
</article>
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