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Add session file support to generate command for progress persistence and resumption #78

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@Copilot Copilot AI commented Jul 24, 2025

Overview

This PR implements session file functionality for the gh models generate command, enabling robust progress tracking, interruption recovery, and consistent execution across runs.

Problem

The generate command previously ran entirely in memory without any persistence mechanism. This meant:

  • If execution was interrupted, all progress was lost
  • No way to resume from partial completion
  • No validation that the same prompt file was being used across runs
  • Risk of inconsistent state when re-running with modified inputs

Solution

Added comprehensive session file support with the following features:

🔧 Core Changes

  1. Required Session File Parameter

    # Session file is now required
    gh models generate --session-file session.json prompt.yml
  2. Progress Persistence

    • Session file stores complete PromptPexContext with all intermediate results
    • Automatic saving after each successful pipeline step
    • JSON format with version metadata and timestamps
  3. Consistency Validation

    • SHA256 hash verification ensures prompt file hasn't been modified
    • Path validation prevents using wrong prompt file with existing session
    • Clear error messages for mismatches
  4. Smart Step Skipping

    • Automatically detects completed steps (intent, rules, tests, etc.)
    • Resumes from the last successful step
    • Prevents redundant computation

📁 Session File Structure

{
  "version": "1.0",
  "created": "2025-07-24T08:52:12.942Z",
  "lastModified": "2025-07-24T08:52:12.942Z", 
  "promptFile": "/path/to/prompt.yml",
  "promptHash": "d188f682de0dd60c5a76bdbfec56ac7917256bca2f5267177d99b631789b0907",
  "context": {
    "runId": "run_1753347132",
    "prompt": { /* complete prompt data */ },
    "intent": "Generated intent...",
    "rules": "Generated rules...",
    "promptPexTests": [ /* test data */ ]
    // ... all pipeline results
  }
}

🔄 Workflow Examples

Initial run:

$ gh models generate --session-file session.json --effort medium prompt.yml
Creating new session: session.json
Generating tests for 'My Prompt'
Generating intent...
Generating input specification...
# ... execution continues

Resuming after interruption:

$ gh models generate --session-file session.json --effort medium prompt.yml  
Loading existing session from: session.json
Session loaded successfully. Checking for completed steps...
Completed steps: [Intent, Input Specification, Output Rules]
Generating tests for 'My Prompt'
Skipping intent (already completed)
Skipping inputSpec (already completed) 
Skipping rules (already completed)
Generating inverse rules...
# ... continues from where it left off

Error handling:

$ gh models generate --session-file session.json modified_prompt.yml
Error: prompt file has been modified since session was created (hash mismatch)

$ gh models generate --session-file session.json different_prompt.yml  
Error: prompt file mismatch: session expects 'prompt.yml' but got 'different_prompt.yml'

Testing

  • ✅ Comprehensive unit tests for session operations and validation
  • ✅ Updated existing integration tests to work with required session file
  • ✅ Manual verification of complete workflow scenarios
  • ✅ Edge case testing (file modifications, interruptions, mismatches)

Breaking Changes

⚠️ Breaking Change: The --session-file flag is now required for the generate command. Existing scripts will need to be updated to include this parameter.

Migration:

# Old usage (will now fail)
gh models generate prompt.yml

# New usage (required)
gh models generate --session-file session.json prompt.yml

Files Changed

  • cmd/generate/generate.go - Added session file flag and integration
  • cmd/generate/pipeline.go - Added session persistence to pipeline steps
  • cmd/generate/session.go - New session management functionality
  • cmd/generate/session_test.go - Comprehensive test coverage
  • cmd/generate/generate_test.go - Updated existing tests

Closes #[issue-number]


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Copilot AI and others added 2 commits July 24, 2025 08:51
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
@Copilot Copilot AI changed the title [WIP] We need to update the generate command in the GitHub Model CLI to include a --session-file option. This session file will always be required and will serve several purposes: 1. Context Storage: The session file will store the promptpx context object, e... Add session file support to generate command for progress persistence and resumption Jul 24, 2025
@Copilot Copilot AI requested a review from pelikhan July 24, 2025 09:06
Copilot finished work on behalf of pelikhan July 24, 2025 09:06
Created time.Time `json:"created"`
LastModified time.Time `json:"lastModified"`
PromptFile string `json:"promptFile"`
PromptHash string `json:"promptHash"`

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  • move PromptHash into the PromptPexContext type

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Done! Moved PromptHash from the SessionFile struct into the PromptPexContext type. This change simplifies the session file structure and provides better logical organization since the prompt hash is closely tied to the prompt data that's already in the context. All tests have been updated and are passing. (d8aedd6)

@@ -107,6 +113,9 @@ func AddCommandLineFlags(cmd *cobra.Command) {
flags.Float64("temperature", 0.0, "Temperature for model inference")
flags.Bool("verbose", false, "Enable verbose output including LLM payloads")
flags.String("http-log", "", "File path to log HTTP requests to (.http, optional)")

// Mark session-file as required
cmd.MarkFlagRequired("session-file")

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not required

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Fixed! Removed the cmd.MarkFlagRequired("session-file") line to make the session file optional. The command now works both with and without a session file, gracefully handling the case when no session file is provided by skipping session persistence. (db40b38)

h.cfg.WriteToOut(fmt.Sprintf("Generating tests for '%s'\n", context.Prompt.Name))

// Calculate prompt hash for session saving

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Already computed and stored in the context.

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Removed the redundant "Step 1: Generate Intent" comment since the runStepWithSession function already handles step identification and completion checking automatically. (db40b38)

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
Copilot finished work on behalf of pelikhan July 24, 2025 09:50
@Copilot Copilot AI requested a review from pelikhan July 24, 2025 09:50
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
Copilot finished work on behalf of pelikhan July 24, 2025 10:04
@pelikhan pelikhan closed this Jul 24, 2025
@pelikhan pelikhan deleted the copilot/fix-d29a4841-1f29-45d3-9ed8-9a7127807f34 branch July 24, 2025 10:42
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2 participants