chore: release v0.17.0

[github-actions]

🤖 New release

• rmcp-macros: 0.16.0 -> 0.17.0
• rmcp: 0.16.0 -> 0.17.0 (⚠ 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 StoredCredentials.token_received_at in /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/transport/auth.rs:69
field StoredCredentials.token_received_at in /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/transport/auth.rs:69
field StreamableHttpServerConfig.json_response in /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/transport/streamable_http_server/tower.rs:45
field StreamableHttpServerConfig.json_response in /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/transport/streamable_http_server/tower.rs:45
field StreamableHttpServerConfig.json_response in /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/transport/streamable_http_server/tower.rs:45
field NumberSchema.default in /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/model/elicitation_schema.rs:263
field StringSchema.default in /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/model/elicitation_schema.rs:119
field IntegerSchema.default in /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/model/elicitation_schema.rs:368
--- failure inherent_method_missing: pub method removed or renamed ---
Description:
A publicly-visible method or associated fn 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/inherent_method_missing.ron
Failed in:
StreamableHttpPostResponse::expect_accepted, previously in file /tmp/.tmpTL9yEE/rmcp/src/transport/streamable_http_client.rs:157
--- 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::delete_session now takes 4 instead of 3 parameters, in file /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/transport/streamable_http_client.rs:184
StreamableHttpClient::get_stream now takes 5 instead of 4 parameters, in file /tmp/.tmpFy1Vz1/rust-sdk/crates/rmcp/src/transport/streamable_http_client.rs:191

Changelog

rmcp-macros

0.17.0 - 2026-02-27

Added

• add trait-based tool declaration (#677)

Other

• add prose documentation for core features to meet conformance (#702)

rmcp

0.17.0 - 2026-02-27

Added

• (streamable-http) add json_response option for stateless server mode (#683)
• mcp sdk conformance (#687)
• add default value support to string, number, and integer schemas (#686)
• add trait-based tool declaration (#677)
• send and validate MCP-Protocol-Version header (#675)

Fixed

• improve error logging and remove token secret from logs (#685)
• refresh token expiry (#680)
• gate optional dependencies behind feature flags (#672)
• allow empty content in CallToolResult (#681)
• (schema) remove AddNullable from draft2020_12 settings (#664)

Other

• add prose documentation for core features to meet conformance (#702)
• Fix/sse channel replacement conflict (#682)
• document session management for streamable HTTP transport (#674)

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