release: 1.77.0

[stainless-app]

Automated Release PR

1.77.0 (2026-06-09)

Full Changelog: v1.76.0...v1.77.0

Features

• api: api update (b7cde24)
• api: api update (d2ecccf)
• api: api update (93d5c22)
• api: api update (3e04824)
• api: api update (e642947)
• api: api update (c10be6e)
• api: api update (cee241d)
• api: api update (3854d6b)
• api: api update (f228554)
• api: api update (67b3d97)
• api: api update (252aef7)
• api: api update (fe8aabc)
• api: api update (8f7ab08)
• api: api update (ced4eb1)
• api: api update (ec6cfcf)
• api: api update (1da3c13)
• api: api update (47e5835)
• api: api update (88d127f)
• api: api update (a960ed8)
• internal/types: support eagerly validating pydantic iterators (0de6c33)
• support setting headers via env (12b4a5f)

Bug Fixes

• client: add missing f-string prefix in file type error message (b931d8d)
• use correct field name format for multipart file arrays (c18d9fa)

Chores

• internal: codegen related update (816b839)
• internal: reformat pyproject.toml (0a622b0)

---

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[devin-ai-integration]

Devin Review found 1 potential issue.

View 2 additional findings in Devin Review.

[devin-ai-integration]

🚩 copy(set_default_headers=...) semantics changed by env header injection

The copy() method at src/modern_treasury/_client.py:521 passes headers to __init__(), which now re-reads MODERN_TREASURY_CUSTOM_HEADERS from the environment at line 204-211. When a user calls copy(set_default_headers={}) intending to clear all custom headers, env-derived headers would still be injected via {**parsed, **default_headers}. This is a semantic change to set_default_headers — previously it would result in zero custom headers, now env headers persist. This is likely intentional (env headers are always-on infrastructure config), but it's worth documenting since it changes the contract of set_default_headers. The same applies to the async client at line 664.

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[devin-ai-integration]

Devin Review found 1 new potential issue.

View 10 additional findings in Devin Review.

[devin-ai-integration]

🚩 Custom env headers could override security-sensitive headers

The new MODERN_TREASURY_CUSTOM_HEADERS env var at src/modern_treasury/_client.py:204-211 allows setting arbitrary headers. Since the env-parsed headers are spread first ({**parsed, **default_headers}), user-passed default_headers take priority, but the Authorization header (set separately in auth_headers at line 469-472) is merged later in the request pipeline and would override any env-set Authorization header. This means the env var cannot accidentally override auth — but it can still set other sensitive headers (e.g., X-Forwarded-For). This is likely acceptable since the user controls their own env, but it's worth documenting the security implications.

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[devin-ai-integration]

Devin Review found 2 new potential issues.

View 11 additional findings in Devin Review.

[devin-ai-integration]

🚩 LedgerEntryCreateRequest.amount changed from Required to optional

In both src/modern_treasury/types/shared/ledger_entry_create_request.py and src/modern_treasury/types/shared_params/ledger_entry_create_request.py, amount was changed from a required field to optional (Optional[int] = None / non-Required). The new amount_string field is also optional. This means neither amount nor amount_string is required, which could allow creating a ledger entry with no amount specified. This appears to be an intentional API spec change (the server presumably validates that at least one is provided), but callers relying on the type system to enforce amount presence will no longer get that guarantee.

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[devin-ai-integration]

🚩 Currency enum removes USDB and USDP stablecoin values

In both src/modern_treasury/types/shared/currency.py and src/modern_treasury/types/shared_params/currency.py, the USDB and USDP currency values were removed from the Currency type. If any existing API consumers are using these currency values, their code would still work at runtime (the values are just strings sent to the API), but type checkers would flag them. This is a potentially breaking change for users relying on these specific currencies.

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