v1.0.17-preview.4

Feature: sub-agent lifecycle hooks

Register OnSubagentStart and OnSubagentStop hooks on the parent session. Start hooks can prepend context to a sub-agent's first prompt. Stop hooks can inspect the response, replace it, or block the stop with a follow-up instruction. (6b4f3a3)

Hooks = new SessionHooks { OnSubagentStart = (input, inv) =>
    Task.FromResult<SubagentStartHookOutput?>(new() { AdditionalContext = "Read the file first." }) }

Hooks: &copilot.SessionHooks{OnSubagentStart: func(in copilot.SubagentStartHookInput, inv copilot.HookInvocation) (*copilot.SubagentStartHookOutput, error) {
    return &copilot.SubagentStartHookOutput{AdditionalContext: "Read the file first."}, nil }}

Feature: binary session filesystem providers

A session filesystem provider can now serve exact file bytes, so the view tool can read provider-only images. Implement the binary provider interface and set Capabilities.Binary. Reads and writes are capped at about 48 MiB. (6b4f3a3)

• C#: implement ISessionFsBinaryProvider (ReadFileBytesAsync, WriteFileBytesAsync)
• Go: implement SessionFSBinaryProvider (ReadFileBytes, WriteFileBytes)

Other changes

• improvement: update the bundled Copilot CLI to 1.0.92-4 and regenerate RPC and session event types across all SDKs (6b4f3a3)
• feature: new session events tool.shell_output and human_response.recorded, plus file-edit details on tool.execution_complete (6b4f3a3)
• feature: new customization reload RPC result types and model discovery types (6b4f3a3)

Warning

Firewall blocked 1 domain

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• github.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "github.com"

See Network Configuration for more information.

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Runtime 1.0.92-0.unstable.r37250855457.gbf21394

Public unstable runtime 1.0.92-0.unstable.r37250855457.gbf21394
Source: bf21394059bab733a06df52b1329cac4b7ee9903
Visibility: public

v1.0.17-preview.3

Feature: replace session tools mid-session (experimental)

A live session's client-supplied tools and handlers can now be replaced in a single call without recreating the session. Built-in, MCP, and plugin tools are unaffected; pass an empty list to remove all of this client's tools. (ef04633)

• TypeScript: await session.setTools([tool])
• C#: await session.SetToolsAsync(tools)
• Python: await session.set_tools([tool])
• Go: session.SetTools(ctx, tools)
• Java: session.setTools(tools).get()
• Rust: session.set_tools([tool]).await?

Other changes

• improvement: update the bundled Copilot CLI version to 1.0.92-3 and regenerate RPC and session event types across all SDKs (ef04633)

Warning

Firewall blocked 2 domains

The following domains were blocked by the firewall during workflow execution:

• api.github.com
• github.com

[!TIP]
api.github.com is blocked because GitHub API access uses the built-in GitHub tools by default. Instead of adding api.github.com to network.allowed, use tools.github.mode: gh-proxy for direct pre-authenticated GitHub CLI access without requiring network access to api.github.com:

tools:
  github:
    mode: gh-proxy

See GitHub Tools for more information on gh-proxy mode.

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "api.github.com"
    - "github.com"

See Network Configuration for more information.

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v1.0.17-preview.2

Other changes

• improvement: [C#] add a custom session event JSON converter and updated generated session event types for Copilot CLI 1.0.92-2 (5b2d7cd)
• improvement: update the bundled Copilot CLI version to 1.0.92-2

Warning

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• github.com

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network:
  allowed:
    - defaults
    - "github.com"

See Network Configuration for more information.

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v1.0.17-preview.1

Full Changelog: v1.0.16...v1.0.17-preview.1

v1.0.16

Internal dependency updates only: this release refreshes the SDK snapshot for Copilot CLI 1.0.90. It contains no other user-visible SDK changes since v1.0.15.

Warning

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• github.com

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    - "github.com"

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v1.0.16-preview.0

Internal dependency updates only (SDK snapshot updated for Copilot CLI 1.0.90-6).

Full Changelog: runtime-1.0.89-1.unstable.r36638597907.ge270afd...v1.0.16-preview.0

Warning

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• github.com

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Runtime 1.0.89-1.unstable.r36793206303.g13aa136

Public unstable runtime 1.0.89-1.unstable.r36793206303.g13aa136
Source: 13aa1367b75fcbaed5e732b92c113b78b9d598a9
Visibility: public

Runtime 1.0.89-1.unstable.r36638597907.ge270afd

Public unstable runtime 1.0.89-1.unstable.r36638597907.ge270afd
Source: e270afdf61628e26a24a8d9fb7b387cfb4ac7b5b
Visibility: public

v1.0.15

Feature: typed structured outputs for all six SDKs

Provide a JSON Schema, or use an idiomatic typed helper, to have the model return typed, validated output instead of free-form text. (#2590)

const answerSchema = z.object({ value: z.number().int() });
const answer = await session.sendAndWait("What is 19 + 23?", answerSchema);

answer = await session.send_and_wait_typed("What is 19 + 23?", Answer)

Go, Java, C#, and Rust get the same capability via copilot.SendAndWait[Answer], session.sendAndWait(prompt, Answer.class), SendAndWaitAsync<Answer>, and session.send_and_wait_typed(prompt).

Feature: structured JSON-RPC error data in all SDKs

The raw JSON data payload of a JSON-RPC error response can now be inspected in every SDK, so apps can branch on machine-readable error details. (#2664, #2732)

if let Some(data) = error.rpc_data() { println!("{data}"); }

catch (JsonRpcException e) { JsonNode data = e.getData(); }

Feature: experimental connection-global installation confirmation

All six SDKs expose a connection-global handler for the runtime's installations.confirm callback, letting apps present a human review before an MCP or Skill installation proceeds. The handler must return an explicit confirm/decline/cancel decision.

const client = new CopilotClient({
  installationConfirmationHandler: async (request, context) => promptUser(request),
});

Java, Python, Rust, C#, and Go get equivalent options (setInstallationConfirmationHandler, installation_confirmation_handler, with_installation_confirmation_handler, InstallationConfirmationHandler). Java also now exposes typed unions for MCP installation review payloads.

Other changes

• feature: [Java] add native runtime support for darwin-x64 (#2701)
• feature: [Java] add native runtime support for linuxmusl-x64 (Alpine) (#2715)
• feature: [Java] experimental FusionCritic generated diagnostics type
• improvement: [Node/Python/Go/.NET/Java] coalesce intercepted HTTP response chunks for better tool-call streaming throughput (#2734)
• improvement: [Rust] coalesce intercepted HTTP response chunks (#2717)
• improvement: [Rust] avoid rebuilding and copying JSON payloads (#2711)
• improvement: [Rust] cut retained runtime-install memory by ~99% (#2676)
• improvement: [.NET] avoid redundant JSON event materialization and reduce allocations (#2733)
• improvement: [Node] pin production dependencies to exact versions with a publish-age policy (#2700)
• bugfix: preserve image replay compatibility across CLI image limits (#2670)

New contributors

• @mohamedmansour made their first contribution in #2676
• @roblourens made their first contribution in #2700

Warning

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• github.com

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    - defaults
    - "github.com"

See Network Configuration for more information.

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