AI Agent Development:
A Trace Map for Tool Failures
A six-field review worksheet
Dmytro Nasyrov PhD
Caller status and tool outcome
Question
Current record
Did the caller receive a response?
The caller reports a timeout.
Did the tool create the ticket?
The tool outcome remains unknown.
Both observations can hold at the same time. The map keeps the missing tool evidence visible.
The six fields in the trace map
Field
Review job
Task reference
Identify the workflow and intended action.
Tool and revision
Identify the operation and implementation version.
Safe input reference
Locate permitted evidence for the submitted arguments.
Attempt relationship
Connect the call to its originating task and earlier attempt.
Caller observation
Record the returned status or local error.
Tool outcome and evidence gap
Separate the external result from the unresolved question.
A synthetic ticket request
Hypothetical workflow: task T-42 asks a tool to create a support ticket. No real request or test.
Field
Example value
Task reference
T-42 / create a support ticket
Tool and revision
create_ticket / revision r7
Safe input reference
payload/T-42/v3 / synthetic record
Attempt relationship
A1 / original attempt for T-42
Caller observation
timeout
Tool outcome and evidence gap
unknown / provider acceptance evidence unavailable
The unresolved evidence gap
Observation
Evidence available
Open question
Caller timeout
Synthetic caller record for A1
What happened at the provider?
Tool outcome unknown
No provider acceptance evidence
Did the provider create a ticket?
Ask the service owner for an approved way to reconcile the request. Keep the outcome unknown until that evidence resolves it.
Record who owns the next check and which evidence can close the question.
The relationship between attempts
Attempt
Relationship
State in this example
A1
Original call for T-42
Caller timeout / tool outcome unknown
A2
Proposed follow-up linked to A1
Proposal only / no execution
An attempt link explains the relationship. It supplies no evidence that either attempt completed.
A proposed retry needs a decision under the tool contract and the applicable action permissions.
Application labels and trace identifiers
OpenTelemetry span context includes a TraceId and SpanId. Parent-child spans relate operations within a trace.
T-42 and A1 are application teaching labels. Keep the application task and attempt references alongside the identifiers from your tracing system.
A span status describes its operation. Reconciliation of the ticket still needs evidence from the tool.
Source: OpenTelemetry Tracing API
Input references and access
Use an input reference approved for investigation. The synthetic value payload/T-42/v3 points to no real customer data.
Define who may read the referenced record and how long to retain it.
W3C Trace Context excludes sensitive information from traceparent and tracestate. Payload logging needs its own approved policy.
Trace requirements in the delivery scope
When a failed tool call leaves the outcome unresolved, Pharos Production offers AI agent development covering tool integration and evaluation. Agree trace evidence and action permissions within the implementation scope.
The map gives the reviewer a proposed record of the open question. A completed worksheet alone does not establish successful tool execution.
About the author
Written by Dmytro Nasyrov PhD, software architect with 24 years of production experience. Dmytro is the founder and CTO of Pharos Production. He works on production software architecture for FinTech, AI, Web3 and blockchain systems.
Dmytro Nasyrov. Photo supplied by the author.