Description: Query parameter concatenation is malformed by using
$"${WelcomeMessageAllowToBeInterrupted}=true" without an '&', likely yielding an invalid
URL and potentially overriding path segments or causing request misrouting.
OutboundPhoneCallFn.cs [110-113]

if (agent.Labels.Contains(WelcomeMessageAllowToBeInterrupted))
{
    processUrl += $"${WelcomeMessageAllowToBeInterrupted}=true";
}

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Follow the guide to enable codebase context checks.

Objective: Ensure all identifiers clearly express their purpose and intent, making code
self-documenting

Status: Passed

Objective: To prevent the leakage of sensitive system information through error messages while
providing sufficient detail for internal debugging.

Status: Passed

Objective: Ensure all data inputs are validated, sanitized, and handled securely to prevent
vulnerabilities

Status:
Malformed query param: The code appends the interruption flag using
$"${WelcomeMessageAllowToBeInterrupted}=true" which introduces a leading
'$' into the query and omits the '&', resulting in an invalid
parameter and potential runtime misbehavior.

if (agent.Labels.Contains(WelcomeMessageAllowToBeInterrupted))
{
    processUrl += $"${WelcomeMessageAllowToBeInterrupted}=true";
}

Objective: To create a detailed and reliable record of critical system actions for security analysis
and compliance.

Status:
Missing audit log: New logic that changes outbound call behavior based on agent labels and modifies the
process URL is not accompanied by any explicit logging of the decision or resulting
parameters for traceability.

if (agent.Labels.Contains(WelcomeMessageAllowToBeInterrupted))
{
    processUrl += $"${WelcomeMessageAllowToBeInterrupted}=true";
}

Objective: Ensure comprehensive error handling that provides meaningful context and graceful
degradation

Status:
Null handling: The conditional branch defaults to non-interruptible when the query parameter is absent
but does not validate conflicting or malformed inputs, and no error handling/logging is
added around the Twilio response generation.

if (request.WelcomeMessageAllowToBeInterrupted.HasValue && request.WelcomeMessageAllowToBeInterrupted.Value)
{
    response = twilio.ReturnInstructions(instruction);
}
else
{
    response = twilio.ReturnNoninterruptedInstructions(instruction);
}

Objective: To ensure logs are useful for debugging and auditing without exposing sensitive
information like PII, PHI, or cardholder data.

Status:
URL construction: The new code appends a query parameter for behavior control to the URL without showing
whether sensitive data may be included elsewhere in the URL or logged; ensure constructed
URLs are not logged with PII.

if (agent.Labels.Contains(WelcomeMessageAllowToBeInterrupted))
{
    processUrl += $"${WelcomeMessageAllowToBeInterrupted}=true";
}

Replace the incorrect $ separator with & when appending the
WelcomeMessageAllowToBeInterrupted query parameter to the URL.

src/Plugins/BotSharp.Plugin.Twilio/OutboundPhoneCallHandler/Functions/OutboundPhoneCallFn.cs [112]

-processUrl += $"${WelcomeMessageAllowToBeInterrupted}=true";
+processUrl += $"&{WelcomeMessageAllowToBeInterrupted}=true";

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