Commits on Mar 20, 2026

1. fix(dotnet): handle unknown session event types gracefully (#881) …

   * fix(dotnet): handle unknown session event types gracefully
   
   Add UnknownSessionEvent type and TryFromJson method so that unrecognized event types from newer CLI versions do not crash GetMessagesAsync or real-time event dispatch.
   
   * refactor: use IgnoreUnrecognizedTypeDiscriminators per review feedback

   

   Ron537 authored Mar 20, 2026
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2. fix: Go codegen enum prefixes and type name reconciliation (#883) …

   * Update @github/copilot to 1.0.10-0
   
   - Updated nodejs and test harness dependencies
   - Re-ran code generators
   - Formatted generated code
   
   * refactor(go): update handwritten files to use prefixed enum constant names
   
   Rename all references to copilot session event type and rpc constants
   to use the new prefixed naming convention matching the generated code:
   
   - copilot.SessionCompactionStart -> copilot.SessionEventTypeSessionCompactionStart
   - copilot.ExternalToolRequested -> copilot.SessionEventTypeExternalToolRequested
   - copilot.PermissionRequested -> copilot.SessionEventTypePermissionRequested
   - copilot.ToolExecutionStart -> copilot.SessionEventTypeToolExecutionStart
   - copilot.AssistantReasoning -> copilot.SessionEventTypeAssistantReasoning
   - copilot.Abort -> copilot.SessionEventTypeAbort
   - rpc.Interactive -> rpc.ModeInteractive
   - rpc.Plan -> rpc.ModePlan
   - rpc.Warning -> rpc.LevelWarning
   - rpc.Error -> rpc.LevelError
   - rpc.Info -> rpc.LevelInfo
   (and all other constants listed in the rename)
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * fix: Go codegen enum prefixes and type name reconciliation
   
   - Add 'mcp' to goInitialisms so toPascalCase produces SessionMCP* matching quicktype
   - Post-process enum constants to use canonical Go TypeNameValue convention
     (replaces quicktype's Purple/Fluffy/Tentacled prefixes and unprefixed constants)
   - Reconcile type names: extract actual quicktype-generated struct names and use them
     in RPC wrapper code instead of recomputing via toPascalCase
   - Extract field name mappings from quicktype output to handle keyword-avoidance renames
   - Update all handwritten Go references to use new prefixed constant names
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * docs: update Go image-input examples to use copilot.AttachmentTypeFile
   
   The generated enum constant was renamed from copilot.File to
   copilot.AttachmentTypeFile to follow Go's TypeNameValue convention.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * fix(codegen): resolve Python type names from quicktype output for acronyms
   
   The Python codegen used toPascalCase() to compute type names like
   SessionMcpListResult, but quicktype generates SessionMCPListResult
   (uppercase MCP). This caused runtime NameError in Python scenarios.
   
   Apply the same approach as go.ts: after quicktype runs, parse the
   generated output to extract actual class names and build a
   case-insensitive lookup map. Use resolveType() in emitMethod() and
   emitRpcWrapper() instead of recomputing names via toPascalCase().
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * fix: update Go E2E tests for agent list and multi-client timeout
   
   - TestAgentSelectionRpc: CLI now returns built-in agents, so instead of
     asserting zero agents, verify no custom agents appear when none configured
   - TestMultiClient: increase broadcast event timeout from 10s to 30s
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Fix LogAsync compilation error by adding missing url parameter
   
   The generated Rpc.LogAsync method added a 'url' parameter between
   'ephemeral' and 'cancellationToken', causing a type mismatch when
   Session.LogAsync passed cancellationToken as the 4th positional arg.
   
   Added the 'url' parameter to Session.LogAsync to match the generated
   Rpc method signature and pass it through correctly.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * fix: address review comments - valuePascal initialisms, Phase 2 regex, add pr/ado
   
   - valuePascal now uses goInitialisms so 'url' -> 'URL', 'mcp' -> 'MCP', etc.
   - Phase 2 regex uses [\s\S]*? to match multi-line func bodies
   - Added 'pr' and 'ado' to goInitialisms
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Fix Python E2E agent list test for built-in agents
   
   The CLI now returns built-in/default agents even when no custom agents
   are configured. Update the assertion to verify no custom test agent
   names appear in the list, rather than asserting the list is empty.
   Matches the pattern used in the Go E2E test.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Skip multi-client broadcast test across Go, Python, and C#
   
   CLI 1.0.7 no longer delivers broadcast external_tool events to
   secondary clients. Skip the 'both clients see tool request and
   completion events' test in all three languages with a clear note.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Revert multi-client broadcast test skips for CLI 1.0.7
   
   Remove the t.Skip/pytest.skip/Fact(Skip=...) additions that were
   disabling the multi-client broadcast tests across Go, Python, and C#.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * fix: remove mcp/pr/ado from goInitialisms to avoid SessionRpc.MCP rename
   
   resolveType() already handles type name reconciliation from quicktype
   output, so these initialisms aren't needed and would cause an unnecessary
   breaking change to the SessionRpc.Mcp field name.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Another Go codegen fix after rebase
   
   * Regenerate code
   
   * Python formatting
   
   Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Type name update
   
   Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Fix Python codegen
   
   Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * fix: update copilot.Blob to copilot.AttachmentTypeBlob and fix Python Optional codegen
   
   - Update Go E2E test, README, and docs to use prefixed enum constant
   - Fix Python codegen modernizePython to handle deeply nested Optional types
   - Fix ruff formatting in e2e/test_multi_client.py
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   ---------
   
   Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   Co-authored-by: Steve Sanderson <SteveSandersonMS@users.noreply.github.com>

   

   

   4 people authored Mar 20, 2026
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3. Add fine-grained system prompt customization (customize mode) (#816) …

   * Add fine-grained system prompt customization (customize mode)
   
   Add a new 'customize' mode for systemMessage configuration, enabling
   SDK consumers to selectively override individual sections of the CLI
   system prompt while preserving the rest. This sits between the existing
   'append' and 'replace' modes.
   
   9 configurable sections: identity, tone, tool_efficiency,
   environment_context, code_change_rules, guidelines, safety,
   tool_instructions, custom_instructions.
   
   4 override actions per section: replace, remove, append, prepend.
   
   Unknown section IDs are handled gracefully: content-bearing overrides
   are appended to additional instructions with a warning, and remove
   on unknown sections is silently ignored.
   
   Types and constants added to all 4 SDK languages (TypeScript, Python,
   Go, .NET). Documentation updated across all READMEs and getting-started
   guide.
   
   Companion runtime PR: github/copilot-agent-runtime#4751
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Address PR review feedback: fix docs, add examples and E2E tests
   
   - Fix incorrect package name in nodejs/README.md (@anthropic-ai/sdk -> @github/copilot-sdk)
   - Add standalone 'System Message Customization' sections with full
     code examples to Python and Go READMEs (matching TypeScript/.NET)
   - Add E2E tests for customize mode to Python, Go, and .NET
     (matching existing Node.js E2E test coverage)
   - Fix 'end of the prompt' wording in docs to 'additional instructions'
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Add last_instructions configurable section
   
   Expose lastInstructions as a customizable section across all 4 SDKs,
   addressing review feedback about duplicate tool-efficiency blocks.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Fix lint: prettier formatting, Python import order and line length
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Add transform operation for system prompt section customization
   
   Adds a new 'transform' action to SectionOverride that enables read-then-write
   mutation of system prompt sections via callbacks. The SDK intercepts function-
   valued actions before serialization, stores the callbacks locally, and handles
   the batched systemMessage.transform JSON-RPC callback from the runtime.
   
   Changes across all 4 SDKs (TypeScript, Python, Go, .NET):
   - Types: SectionTransformFn, SectionOverrideAction (TS/Python), Transform
     field (Go/.NET), SectionOverrideAction constants (Go)
   - Client: extractTransformCallbacks helper, transform callback registration,
     systemMessage.transform RPC handler
   - Session: transform callback storage and batched dispatch with error handling
   - E2E tests and shared snapshot YAML files
   
   Wire protocol: single batched RPC call with all transform sections, matching
   the runtime implementation in copilot-agent-runtime PR #5103.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Formatting
   
   Co-Authored-By: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Add E2E snapshot for customized systemMessage config test
   
   Generate the missing snapshot file that the 'should create a session
   with customized systemMessage config' test requires across all SDK
   languages (Node, Python, Go, .NET).
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Fix Go fmt blank comment line and Python import ordering
   
   - Add blank // comment line between doc example and extractTransformCallbacks
     function doc comment in go/client.go (required by go fmt)
   - Fix ruff import sorting in python/copilot/__init__.py
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Fix Python ty type error in session transform handler
   
   Use str() to ensure transform callback result is typed as str,
   fixing the invalid-assignment error from ty type checker at
   session.py:689.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Fix Python E2E test to use keyword args for create_session
   
   The create_session() method was refactored to keyword-only params.
   Update the customized systemMessage test to use keyword arguments
   instead of a positional dict, and fix send_and_wait() call to pass
   prompt as a positional string.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Assert transform result in system message via HTTP traffic
   
   The 'should apply transform modifications' tests previously only verified
   that the transform callback was invoked, not that the transformed content
   actually reached the model. Now all 4 SDKs assert that TRANSFORM_MARKER
   appears in the system message captured from HTTP traffic.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   * Fix Go transform JSON serialization: add json tags for content field
   
   The systemMessageTransformRequest and systemMessageTransformResponse
   used anonymous structs without json tags, causing Content to serialize
   as uppercase 'Content' instead of lowercase 'content'. The CLI expects
   lowercase, so transform results were silently ignored.
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   
   ---------
   
   Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
   Co-authored-by: Steve Sanderson <SteveSandersonMS@users.noreply.github.com>

   

   3 people authored Mar 20, 2026
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4. Merge remote-tracking branch 'upstream/main' into types-no-more

   

   brettcannon authored and SteveSandersonMS committed Mar 20, 2026
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