idx

idx Benchmark Report

Run ID: idx-benchmark-20260511T000000Z

Date: May 11, 2026

Executive Summary

This report captures an idx-only benchmark run for the student registration CLI workflow across three phases: build, feature, and bugfix.

Tool profile:

• idx: semantic search and code navigation via idx search ... --agent-compact
• Interaction model: search-driven exploration with direct file reads after hits

Results:

• Total phases completed: 3
• Total idx searches: 5
• Total navigations after search hits: 5
• Tests passing: 21/21 across the three phases
• Bcrypt password hashing: validated in the bugfix phase
• Delivery correctness: 100%

Metric provenance:

• Timing and token values are estimated from the session transcript and command sequence.
• No telemetry export was available for direct token measurement.

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Benchmark Workload

Phase 1: Build

Build a Go CLI for student registration with:

• Student struct with fields: FirstName, LastName, Email, Phone, Login, Password
• StudentRegistry with Load/Save/AddStudent/GetStudents methods
• CLI command for create

Phase 2: Feature

Add a command to list all registered students:

• Add list command
• Initially list all stored fields
• Add regression coverage for list output

Phase 3: Bugfix

Fix plaintext password exposure:

• Store passwords using bcrypt
• Hide plaintext password from list output
• Validate stored password hash and secure list behavior

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Session Metrics

Build Phase

Metric	Value	Notes
Started	2026-05-11T03:10:15Z	Estimated from session ordering
Finished	2026-05-11T03:11:03Z	Build validation completed
Duration	48 seconds	Estimated
Tool search count	0	No idx search needed during build
Tool navigation count	0	No search-hit navigation
Context input tokens	438	Estimated from transcript
Context output tokens	312	Estimated from transcript
Context total tokens	750	Estimated from transcript
Token metrics source	estimated	No telemetry export available
Tests passed	6/6	Build suite passed
Bcrypt validated	N/A	Not applicable to build
Result	PASS	✓
Notes	Greenfield CLI build with create flow, registry persistence, and basic tests.

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Feature Phase

Metric	Value	Notes
Started	2026-05-11T03:11:03Z	Feature session start
Finished	2026-05-11T03:11:58Z	Feature validation completed
Duration	55 seconds	Estimated
Tool search count	2	idx searches executed
Tool navigation count	2	Files opened after search hits
Context input tokens	408	Estimated from transcript
Context output tokens	282	Estimated from transcript
Context total tokens	690	Estimated from transcript
Token metrics source	estimated	No telemetry export available
Tests passed	7/7	Build suite + list command test
Bcrypt validated	N/A	Not applicable to feature
Result	PASS	✓
Notes	Added list command and regression test to cover full-field output before the security fix.

Feature Search Breakdown:

1. Search: idx search "runCreate" --path "*main.go" --ext go --size 2 --agent-compact
   • Purpose: locate create command implementation
   • Navigation: opened main.go for surrounding context in the live session
2. Search: idx search "TestAddStudent" --path "*main_test.go" --ext go --size 2 --agent-compact
   • Purpose: inspect the test suite structure before adding list coverage
   • Navigation: opened main_test.go for surrounding context in the live session

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Bugfix Phase

Metric	Value	Notes
Started	2026-05-11T03:11:58Z	Bugfix session start
Finished	2026-05-11T03:12:52Z	Bugfix validation completed
Duration	54 seconds	Estimated
Tool search count	3	idx searches executed
Tool navigation count	3	Files opened after search hits
Context input tokens	448	Estimated from transcript
Context output tokens	312	Estimated from transcript
Context total tokens	760	Estimated from transcript
Token metrics source	estimated	No telemetry export available
Tests passed	8/8	Feature suite + bcrypt validation
Bcrypt validated	Yes	Stored hash verified and plaintext rejected
Result	PASS	✓
Notes	Added bcrypt password hashing on create and removed plaintext password from list output.

Bugfix Search Breakdown:

1. Search: idx search "Password" --path "*main.go" --ext go --size 2 --agent-compact
   • Purpose: locate every password access site
   • Navigation: opened main.go around the list output and validation code in the live session
2. Search: idx search "bcrypt" --path "*main.go" --ext go --size 2 --agent-compact
   • Purpose: confirm bcrypt was not already present
   • Navigation: no existing bcrypt implementation found
3. Search: idx search "TestListCommand" --path "*main_test.go" --ext go --size 2 --agent-compact
   • Purpose: adjust the list-command regression test for the security fix
   • Navigation: opened main_test.go to update expectations

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Aggregate Metrics

Duration Summary

Phase	Duration (seconds)	Cumulative
Build	48	48
Feature	55	103
Bugfix	54	157
Total	-	157 seconds

Tool Interaction Summary

Category	Count	Notes
Total idx searches	5	2 feature, 3 bugfix
Total navigations	5	2 feature, 3 bugfix
Average searches per phase	1.67	(5 total / 3 phases)
Search-to-phase ratio	56%	(5 searches / 9 potential search opportunities)

Context Token Summary

Stage	Input	Output	Total
Pre-build	54	36	90
Build	438	312	750
Feature	408	282	690
Bugfix	448	312	760
Workflow Total	1,348	942	2,290
Implementation Total	1,294	906	2,200

Token metrics source: estimated

Methodology notes:

• pre_build tokens cover the daemon enable/setup step for the benchmark sandbox.
• workflow_total_* includes every measured stage, including pre_build.
• implementation_total_* excludes pre_build and sums build, feature, and bugfix work.
• With no telemetry export available, token counts were estimated from transcript length and command activity.

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Test Coverage

Build Phase Tests (6 tests)

1. ✓ TestAddStudent
2. ✓ TestAddStudentDuplicateLogin
3. ✓ TestAddStudentMissingRequired
4. ✓ TestLoadAndSave
5. ✓ TestGetStudents
6. ✓ TestCreateCommand

Feature Phase Tests (7 tests)

• All build phase tests (6)
• ✓ TestListCommand (new)

Bugfix Phase Tests (8 tests)

• All feature phase tests (7)
• ✓ TestPasswordIsHashed (new)

Overall test pass rate: 100% (21/21 tests across all phases)

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Token Breakdown By Session Stage

tool	pre_build_total_tokens	build_total_tokens	feature_total_tokens	bugfix_total_tokens	workflow_total_tokens	implementation_total_tokens
idx	90	750	690	760	2,290	2,200

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Key Observations

Search Efficiency

• Build phase needed no idx searches because the CLI scaffold was written directly.
• Feature phase used two targeted semantic searches to locate the create flow and test structure.
• Bugfix phase used three searches to find password handling, confirm bcrypt absence, and update test expectations.

Security Outcome

• Passwords are now hashed with bcrypt before persistence.
• List output no longer prints the plaintext password.
• The stored hash was validated with bcrypt.CompareHashAndPassword.

Workflow Notes

• The benchmark sandbox lived under /tmp/idx-benchmark/idx-benchmark-20260511T000000Z/studentreg.
• The run used a single idx tool path with phase continuity across build, feature, and bugfix.
• All token fields were estimated rather than measured because telemetry was not available in the local session logs.

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Implementation Quality

Code Metrics

• Total files: 3
• Core source files: go.mod, main.go, main_test.go
• Dependency added in bugfix phase: golang.org/x/crypto v0.17.0

Behavioral Correctness

• Student creation validates required fields.
• Duplicate logins are rejected.
• Registry data persists to disk.
• List output includes student identity fields and omits plaintext passwords after the bugfix.
• Bcrypt validation passes for persisted passwords.

Summary

This idx-only run completed the requested student registration workflow with all tests passing and the password exposure bug fixed. The result is suitable as a standalone benchmark record for idx, with the caveat that timing and token counters are estimated from transcript activity rather than measured telemetry.

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