chore: release v0.16.0

[github-actions]

🤖 New release

• rmcp-macros: 0.15.0 -> 0.16.0
• rmcp: 0.15.0 -> 0.16.0 (⚠ API breaking changes)

⚠ rmcp breaking changes

--- failure constructible_struct_adds_field: externally-constructible struct adds field ---

Description:
A pub struct constructible with a struct literal has a new pub field. Existing struct literals must be updated to include the new field.
        ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field StreamableHttpClientTransportConfig.custom_headers in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/transport/streamable_http_client.rs:775
  field AuthorizationMetadata.code_challenge_methods_supported in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/transport/auth.rs:297
  field GetTaskResult.meta in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/model/task.rs:68
  field StoredCredentials.granted_scopes in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/transport/auth.rs:63
  field StoredCredentials.granted_scopes in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/transport/auth.rs:63

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/enum_variant_added.ron

Failed in:
  variant StreamableHttpError:InsufficientScope in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/transport/streamable_http_client.rs:78
  variant StreamableHttpError:ReservedHeaderConflict in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/transport/streamable_http_client.rs:80
  variant ServerResult:GetTaskResult in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/model.rs:2702
  variant ServerResult:CancelTaskResult in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/model.rs:2702
  variant ServerResult:GetTaskPayloadResult in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/model.rs:2702
  variant AuthError:InsufficientScope in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/transport/auth.rs:281
  variant AuthError:InsufficientScope in /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/transport/auth.rs:281

--- failure enum_variant_missing: pub enum variant removed or renamed ---

Description:
A publicly-visible enum has at least one variant that is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/enum_variant_missing.ron

Failed in:
  variant ServerResult::GetTaskInfoResult, previously in file /tmp/.tmpm7FZpl/rmcp/src/model.rs:2708
  variant ServerResult::TaskResult, previously in file /tmp/.tmpm7FZpl/rmcp/src/model.rs:2708

--- failure struct_missing: pub struct removed or renamed ---

Description:
A publicly-visible struct cannot be imported by its prior path. A `pub use` may have been removed, or the struct itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/struct_missing.ron

Failed in:
  struct rmcp::model::TaskResult, previously in file /tmp/.tmpm7FZpl/rmcp/src/model/task.rs:26

--- failure trait_method_parameter_count_changed: pub trait method parameter count changed ---

Description:
A trait method now takes a different number of parameters.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#major-any-change-to-trait-item-signatures
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/trait_method_parameter_count_changed.ron

Failed in:
  StreamableHttpClient::post_message now takes 5 instead of 4 parameters, in file /tmp/.tmpnvRcz9/rust-sdk/crates/rmcp/src/transport/streamable_http_client.rs:172

Changelog

rmcp-macros

0.16.0 - 2026-02-17

Fixed

• align task response types with MCP spec (#658)

Other

• include LICENSE in final crate tarball (#657)
• add rudof-mcp to MCP servers list (#645)

rmcp

0.16.0 - 2026-02-17

Added

• add support for custom HTTP headers in StreamableHttpClient (#655)
• (auth) add token_endpoint_auth_method to OAuthClientConfig (#648)

Fixed

• remove unnecessary doc-cfg (#661)
• duplicate meta serialization (#662)
• sort list_all() output in ToolRouter and PromptRouter for deterministic ordering (#665)
• align task response types with MCP spec (#658)

Other

• upgrade reqwest to 0.13.2 (#669)
• include LICENSE in final crate tarball (#657)
• (deps) update rand requirement from 0.9 to 0.10 (#650)
• remove unused axum dependency from server-side-http feature (#642)
• 11-25-2025 compliant Auth (#651)
• add rudof-mcp to MCP servers list (#645)

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